CN104994038B - A kind of bandwidth allocation methods and optical access network system - Google Patents

Abstract

The embodiment of the present invention discloses a bandwidth allocation method and an optical access network system. The method includes: the reflective semiconductor optical amplifier of the first optical network unit sends the REPORT frame to the optical link terminal; The network unit feeds back the generated GATE frame; the optical signal with the wavelength of the second optical network unit sent by the adjustable transmitter of the first optical network unit is distributed to the second optical network after passing through the isolator, coupler, and wavelength selective switch The output port corresponding to the unit outputs an optical signal based on the output channel range corresponding to the output port, and then under the action of the optical splitter, all the optical network units in the same group as the second optical network unit receive light through their respective receivers signal; the second optical network unit retains the optical signal and performs corresponding processing. By applying the embodiment of the present invention, while realizing the P2P communication between the optical network units in the optical access network, the dynamic allocation of the bandwidth is realized.

Description

A bandwidth allocation method and optical access network system

technical field

The invention relates to the field of communication technology, in particular to a bandwidth allocation method and an optical access network system.

Background technique

An OAN (Optical Access Network, Optical Access Network) is a collection of access connections supported by an optical transmission system that share the same network-side interface. The optical access network may include multiple ODNs (Optical Distribution Network, optical distribution network) and ONUs (Optical Network Unit, optical network unit) connected to the same OLT (Optical Line Terminal, optical link terminal). The ODN is located between the OLT and the ONU, and provides an optical transmission channel between the OLT and the ONU.

At present, when one ONU in the OAN network communicates with another ONU, one ONU needs to send the information to the OLT first, and then the OLT forwards the information to another ONU; ONUs cannot communicate directly, that is, ONUs cannot For P2P (Peer-to-Peer, also known as peer-to-peer) communication, the communication efficiency is low.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a bandwidth allocation method and an optical access network system to dynamically allocate bandwidth while realizing P2P communication between ONUs in the optical access network and improving communication efficiency.

In order to achieve the above purpose, the embodiment of the present invention discloses a bandwidth allocation method, which is applied to an optical access network system, and the optical access network system includes: an optical link terminal, and multiple optical networks divided into multiple groups A unit and an optical distribution network; wherein each optical network unit includes an adjustable transmitter, a receiver and a reflective semiconductor optical amplifier, and the optical distribution network includes an intelligent remote node, an optical splitter and a one-way conducting isolator, The intelligent remote node includes a coupler, a controller and a wavelength selective switch, each group includes at least one optical network unit and shares a wavelength and an optical splitter, and each optical network unit uniquely corresponds to a one-way conducting isolator, The wavelength selective switch includes an input port and a plurality of output ports, and each output port corresponds to a group; and, the optical link terminal counts the total amount of bandwidth required by each group in real time, and according to the total bandwidth of the statistics , adjusting the output channel range of the output port corresponding to each group of the wavelength selective switch through the controller in the optical distribution network; the method includes:

When there is a communication requirement between the first ONU and the second ONU:

The first optical network unit uses its own reflective semiconductor optical amplifier to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler, wherein the REPORT frame includes the optical link The address of the road terminal, the address of the first ONU, and the logical link identifier of the second ONU, the logical link identifier of the second ONU is pre-stored in the first ONU In the unit, the first optical network unit and the second optical network unit are any two of a plurality of optical network units;

The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit, wherein the GATE frame includes the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link terminal pre-stores The corresponding relationship between the logical link identifier and the wavelength of each optical network unit;

The first optical network unit uses its own adjustable transmitter to modulate the service information about the second optical network unit according to the received wavelength of the second optical network unit in the GATE frame to have a first optical signal at the wavelength of the second optical network unit, and sending the first optical signal to a coupler in the optical distribution network through the isolator;

The coupler in the optical distribution network couples the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the second The output port corresponding to the optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then under the action of the optical splitter, all the optical network units in the same group as the second optical network unit Optical network units receive the first optical signals through respective receivers;

The second optical network unit retains the first optical signal and performs corresponding processing, and other optical network units in the same group as the second optical network unit discard the first optical signal.

Preferably, the method also includes:

When there is a communication requirement between the optical link terminal and the third optical network unit:

The optical link terminal modulates the service information about the third optical network unit into a second optical signal having the wavelength of the third optical network unit, and sends the second optical signal to the optical wiring A coupler for a network, wherein the third ONU is any one of a plurality of ONUs;

The coupler in the optical distribution network couples the second optical signal into the input port of the wavelength selective switch, and after the second optical signal enters the wavelength selective switch, it is distributed to the third The output port corresponding to the optical network unit outputs the second optical signal based on the output channel range corresponding to the output port, and then under the function of the optical splitter, all the optical network units in the same group as the third optical network unit Optical network units receive the second optical signals through respective receivers;

The third optical network unit retains the second optical signal and performs corresponding processing, and other optical network units in the same group as the third optical network unit discard the second optical signal.

Preferably, the method also includes:

When there is a communication requirement between the fourth optical network unit and the optical link terminal:

The reflective semiconductor optical amplifier in the fourth optical network unit utilizes the third optical signal having the wavelength of the fourth optical network unit sent by the optical link terminal to the fourth optical network unit, and transmits The service information about the optical link terminal is modulated into a third optical signal having the wavelength of the fourth optical network unit, and the third optical signal is sequentially passed through the optical splitter and wavelength selection of the optical distribution network The switch and the coupler send to the optical link terminal, wherein the fourth optical network unit is any one of a plurality of optical network units;

The optical link terminal receives the third optical signal and performs corresponding processing.

Preferably, the communication services include any one or a combination of the following services:

EF fast forwarding service, AF guaranteed forwarding service, BE best effort forwarding service and P2P peer-to-peer communication service.

Preferably, the optical link terminal is provided with a flag for indicating whether there are other optical network units currently performing P2P communication with the second optical network unit;

The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit includes:

The optical link terminal judges whether there is currently an optical network unit performing P2P communication with the second optical network unit according to the value of the flag, and if not, according to the first optical network included in the REPORT frame The address of the unit and the logical link identifier of the second optical network unit, generate a GATE frame, and feed back the GATE frame to the first optical network unit, and modify the value of the flag to indicate that there are currently other A mark for P2P communication between the ONU and the second ONU.

Preferably, the optical link terminal stores the weight value of the P2P communication between each optical network unit and the second optical network unit in each cycle;

The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit includes:

The optical link terminal judges whether the weight value of the P2P communication between the first optical network unit and the second optical network unit in the current cycle is among the weight values stored in the optical link terminal according to the stored weight value. The smallest value, if yes, generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feed back the GATE frame to the first optical network unit.

In order to achieve the above purpose, the embodiment of the present invention also discloses an optical access network system, including: an optical link terminal, a plurality of optical network units divided into a plurality of groups, and an optical distribution network; wherein,

Each optical network unit includes an adjustable transmitter, a receiver, and a reflective semiconductor optical amplifier. The optical distribution network includes an intelligent remote node, an optical splitter, and a one-way conducting isolator. The intelligent remote node includes a coupling device, controller and wavelength selective switch, each group includes at least one optical network unit and shares one wavelength and one optical splitter, each optical network unit uniquely corresponds to a unidirectional conduction isolator, and the wavelength selective switch includes an input port and multiple output ports, each output port corresponds to a group;

The reflective semiconductor optical amplifier of the first optical network unit is configured to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler, wherein the REPORT frame includes the optical link The address of the terminal, the address of the first ONU, and the logical link identifier of the second ONU, where the logical link identifier of the second ONU is pre-stored in the first ONU, The first ONU and the second ONU are any two of a plurality of ONUs;

The optical link terminal is configured to generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and send the GATE frame Feedback to the first optical network unit, wherein the GATE frame includes the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link terminal The corresponding relationship between the logical link identifier and the wavelength of each optical network unit is stored in advance;

The optical link terminal is also used to count the total amount of bandwidth required by each group in real time, and adjust the wavelength selection switch through the controller in the optical distribution network according to the total amount of bandwidth that is counted. The output channel range of the output port corresponding to each group and the bandwidth allocation of communication services by adjusting the wavelength selection switch through the controller in the optical distribution network;

The adjustable transmitter of the first optical network unit is configured to modulate the service information about the second optical network unit into a first optical signal having the wavelength of the second optical network unit, and transmit the second optical network unit sending an optical signal through the isolator to a coupler in the optical distribution network;

The coupler in the optical distribution network is used to couple the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the The output port corresponding to the second optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then under the function of the optical splitter, it is in the same position as the second optical network unit All optical network units of the group receive the first optical signal through their respective receivers;

The second optical network unit is configured to perform corresponding processing on the first optical signal.

Preferably, the reflective semiconductor optical amplifier is further configured to use the third optical signal with the wavelength of the fourth optical network unit sent to the fourth optical network unit by the optical link terminal to transmit the Modulating the service information of the optical link terminal into a third optical signal having the wavelength of the fourth optical network unit, and passing the third optical signal through the optical splitter, the wavelength selective switch and the optical distribution network in sequence The coupler sends to the optical link terminal, wherein the fourth optical network unit is any one of a plurality of optical network units;

The optical link terminal is further configured to receive the third optical signal and perform corresponding processing.

It can be seen from the above technical solution that the embodiment of the present invention provides a bandwidth allocation method and an optical access network system, the method includes: the reflective semiconductor optical amplifier of the first optical network unit sends the REPORT frame through the wavelength selective switch and the coupler To the optical link terminal; the optical link terminal feeds back the generated GATE frame to the first optical network unit; the optical signal with the wavelength of the second optical network unit sent by the adjustable transmitter of the first optical network unit passes through the isolator, coupling After the splitter and the wavelength selective switch, it is distributed to the output port corresponding to the second optical network unit to output the optical signal based on the output channel range corresponding to the output port, and then under the action of the optical splitter, it is in the same position as the second optical network unit All optical network units of the same group receive optical signals through their respective receivers; the second optical network unit retains the optical signals and performs corresponding processing. By applying the technical solution provided by the embodiment of the present invention, the P2P communication between the optical network units in the optical access network is realized, and the communication efficiency is improved, and the bandwidth is dynamically allocated.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic flowchart of a bandwidth allocation method provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an optical access network system provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a REPORT frame provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of a GATE frame structure provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In order to solve the problems in the prior art, the embodiment of the present invention provides a bandwidth allocation method and an optical access network system. A bandwidth allocation method provided by an embodiment of the present invention is firstly introduced below.

It should be noted that the bandwidth allocation method provided by the embodiment of the present invention is preferably applicable to an optical access network system, the optical access network system is shown in Figure 2, and Figure 2 is an optical access network system provided by an embodiment of the present invention A schematic structural diagram of a network system; the optical access network system may include: an optical link terminal, a plurality of optical network units divided into multiple groups, and an optical distribution network; wherein each optical network unit includes an adjustable transmitter, A receiver and a reflective semiconductor optical amplifier, the optical distribution network includes an intelligent remote node, an optical splitter and a one-way conducting isolator, and the intelligent remote node includes a coupler, a controller and a wavelength selective switch, each The group includes at least one optical network unit and shares a wavelength and an optical splitter, each optical network unit uniquely corresponds to a unidirectional isolator, and the wavelength selective switch includes an input port and a plurality of output ports, and each output port corresponds to a group;

FIG. 1 is a schematic flowchart of a bandwidth allocation method provided by an embodiment of the present invention, which may include:

S101: The first optical network unit uses its own reflective semiconductor optical amplifier to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler;

Wherein, the REPORT frame includes the address of the optical link terminal, the address of the first optical network unit, and the logical link identifier of the second optical network unit, and the logical link identifier of the second optical network unit The path identifier is pre-stored in the first optical network unit, and the first optical network unit and the second optical network unit are any two of a plurality of optical network units;

S102: The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the first optical network unit;

Wherein, the GATE frame includes the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link terminal pre-stores the logical chain of each optical network unit Correspondence between road identification and wavelength;

S103: The first optical network unit uses its own adjustable transmitter to modulate the service information about the second optical network unit according to the wavelength of the second optical network unit included in the received GATE frame being a first optical signal having a wavelength of the second optical network unit, and sending the first optical signal through the isolator to a coupler in the optical distribution network;

S104: The coupler in the optical distribution network couples the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the The output port corresponding to the second optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then is in the same group as the second optical network unit under the action of the optical splitter All optical network units of receive the first optical signal through their respective receivers;

S105: The second optical network unit retains the first optical signal and performs corresponding processing, and other optical network units in the same group as the second optical network unit discard the first optical signal.

Exemplarily, it is assumed that the first ONU is the ONU 1k shown in FIG. 2, and the second ONU is the ONU nk shown in FIG. 2. When the ONU lk and the ONU nk exist When communication is required, the optical network unit 1k uses its own reflective semiconductor optical amplifier to send the REPORT frame to the optical link terminal through the wavelength selective switch and the coupler. The REPORT frame structure is shown in Figure 3, wherein the REPORT frame structure includes at least The address of the optical link terminal, the address of the source optical network unit, the logical link identifier of the target optical network unit, the queue length of the four services of EF fast forwarding service, AF guaranteed forwarding service, BE best effort forwarding service and P2P peer-to-peer communication service ; Among them, EF fast forwarding service (Expedited Forwarding): mainly used for low-latency, jitter and packet loss rate services, such services generally run a relatively stable rate and require fast forwarding; AF Assured Forwarding service (Assured Forwarding): This type of service can ensure forwarding when the maximum allowable bandwidth is not exceeded; BE best-effort forwarding service (Best Effort BE): best-effort forwarding, mainly used for services that are not sensitive to delay, jitter and packet loss; P2P peer-to-peer communication service (Peer to Peer): It is a service specially used to transmit peer-to-peer communication between ONUs.

Specifically, a cache mapping area can be designed in the optical network unit 1k for storing the routing table, which stores the logical link marks of the optical network units in the entire optical access network system at the current moment, that is, the optical network The logical link identifier of the unit nk is pre-stored in the ONU lk.

The corresponding relationship between the logical link identifier and the wavelength of each optical network unit is pre-stored in the optical link terminal, and the GATE frame is generated according to the address of the optical network unit 1k included in the REPORT frame and the logical link identifier of the optical network unit nk, and Feedback the GATE frame to the optical network unit 1k. Specifically, the GATE frame structure is shown in FIG. 4, wherein the GATE frame structure includes at least the address of the source optical network unit, the address of the optical link terminal, and the wavelength of the target optical network unit , the start time of uploading and the amount of data that can be uploaded for the above four services EF fast forwarding service, AF guaranteed forwarding service, BE best effort forwarding service and P2P peer-to-peer communication service, among them, the starting time of communication service uploading start And the amount of data that can be uploaded is the bandwidth allocation of the optical link terminal to the communication service.

According to the wavelength of the optical network unit nk included in the received GATE frame, the optical network unit 1k uses its own adjustable transmitter to modulate the service information about the optical network unit nk into a first optical signal with the wavelength of the optical network unit nk , and sending the first optical signal to the coupler in the optical distribution network through the isolator;

The coupler in the optical distribution network couples the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the output port corresponding to the optical network unit nk to be based on the output port The corresponding output channel range outputs the first optical signal, and then under the action of the optical splitter, all the optical network units (optical network unit n1, optical network unit n2, ... optical network unit) in the same group as the optical network unit nk nk) receiving said first optical signal via a respective receiver;

The optical network unit nk retains the first optical signal and performs corresponding processing, and other optical network units in the same group as the second optical network unit (optical network unit n1, optical network unit n2...optical network unit nk-1 ) discarding the first optical signal.

In practical applications, the optical link terminal can be provided with a flag L _{nk used to indicate whether there are other optical network units currently performing P2P communication with the optical network unit nk} ; when L _nk =1, it indicates that there are currently optical network units and optical The network unit nk performs P2P communication. When L _nk =0, it means that no optical network unit currently performs P2P communication with the optical network unit nk. The optical link terminal generates a GATE frame according to the address of the optical network unit 1k included in the REPORT frame and the logical link identifier of the optical network unit nk, and feeds back the GATE frame to the optical network unit 1k, and the optical link terminal can value, to determine whether there is currently an optical network unit performing P2P communication with the optical network unit nk, if not, according to the address of the optical network unit 1k included in the REPORT frame and the logical link identifier of the optical network unit nk, generate a P2P The GATE frame for the bandwidth allocation of the communication service is fed back to the ONU 1k, and the value of the flag is modified to a flag indicating that other ONUs are currently performing P2P communication with the ONU nk.

Specifically, the optical link terminal judges whether the value of the flag L _nk used to indicate whether there are other optical network units currently performing P2P communication with the optical network unit nk is 1; if L _nk =1, it means that there are currently other optical network units and optical network units nk When the network unit nk performs P2P communication, it generates a GATE frame that does not include the bandwidth allocation of the P2P communication service; if L _nk =0, then generates a GATE frame that includes at least the bandwidth allocation of the P2P communication service, and feeds back the GATE frame to the optical network unit 1k, and modify the value of L _nk to 1, which avoids the wavelength conflict of multiple ONUs performing P2P communication with ONU nk at the same time.

In practical applications, the weight value of each optical network unit communicating with the second optical network unit in each cycle can be stored in the optical link terminal; A weight value for the network unit nk to perform P2P communication. In practical applications, the weight value may be equal to the allocated time slot/poll time. The optical link terminal generates a GATE frame according to the address of the optical network unit 1k included in the REPORT frame and the logical link identifier of the optical network unit nk, and feeds back the GATE frame to the optical network unit 1k; the optical link terminal can value, judging whether the weight value of the P2P communication between the optical network unit 1k and the optical network unit nk in the current cycle is the smallest value among the weight values stored in the optical link terminal, if yes, according to the weight value included in the REPORT frame The address of the ONU 1k and the logical link identifier of the ONU nk generate a GATE frame, and feed back the GATE frame to the ONU lk.

Specifically, the optical link terminal judges whether the weight value of the P2P communication between the optical network unit 1k and the optical network unit nk in the current cycle is the smallest value among the weight values stored in the optical link terminal, and if so, the next cycle The optical network unit 1k performs P2P communication with the optical network unit nk. At this time, the optical link terminal generates a GATE frame at least including the bandwidth allocation of the P2P communication service, and feeds the GATE frame back to the optical network unit 1k, avoiding a certain optical network unit and The ONU nk performs P2P communication for too long, and the occupation of the channel results in an unfair phenomenon that other ONUs cannot perform P2P communication with the ONU nk for a long time.

In practical applications, the data frame header for P2P communication may include the address of the source ONU, the address of the destination ONU, the logical link identifier of the source ONU, the logical link identifier of the destination ONU, and An identification bit, when the identification bit is 1, it indicates that the data frame is used for P2P communication.

In practical applications, the optical link terminal can count the total amount of bandwidth required by each group in real time, and adjust the wavelength selection switch's wavelength by the controller in the optical distribution network according to the total amount of bandwidth that is counted. The output channel range of the output port corresponding to each group and the bandwidth of the communication service are allocated by adjusting the wavelength selection switch through the controller in the optical distribution network.

Exemplarily, when the optical link terminal counts that the bandwidth of the group where the optical network unit nk is located cannot meet the current network load, at this time, the bandwidth of the group where the optical network unit nk is located at the port corresponding to the wavelength selection switch can be adjusted through the controller, specifically Yes, the output channel range of each output port of the wavelength selective switch is composed of multiple slices, and when the range of the slice is changed, the bandwidth corresponding to the output channel range of the output port can be changed. It can be understood that the wavelengths used in the optical access network provided by the embodiments of the present invention are wavelengths in the C-band, the central wavelength range is 1528.4-1566.9nm, each wavelength interval is 0.1nm, and the corresponding bandwidth differs by 12.5G. When the command dcc 1=110:112 is input, the center wavelength is 1555.6966nm and the bandwidth is 25G. When the command dcc 1=110:114 is input, the center wavelength is 1555.595696nm and the bandwidth is increased to 50G.

In practical applications, there is also a requirement that the optical link terminal and the third optical network unit need to communicate. Assuming that the third optical network unit is the optical network unit 11 shown in FIG. 2, when the optical link terminal and the optical network unit 11 When there is a communication requirement, the optical link terminal modulates the service information about the optical network unit 11 into a second optical signal with the wavelength of the optical network unit 11, and sends the second optical signal to the optical distribution network coupler; the coupler in the optical distribution network couples the second optical signal into the input port of the wavelength selective switch, and the second optical signal is distributed to the optical network unit after entering the wavelength selective switch The output port corresponding to 11 outputs the second optical signal based on the output channel range corresponding to the output port, and then under the action of the optical splitter, all optical network units (optical network units (optical network units) in the same group as the optical network unit 11 The network unit 11, the optical network unit 12...the optical network unit 1k) receives the second optical signal through their respective receivers; the optical network unit 11 retains the second optical signal and performs corresponding processing, and is in the same position as the optical network unit 11 Other ONUs of the same group (ONU 12, ONU 13... ONU 1k) discard the optical signal.

While realizing the P2P communication between the optical network units, it can also realize the active communication between the optical link terminal and the optical network unit, that is, the optical link terminal sends some specific service information to the optical network unit.

In practical applications, there is still a need for the fourth ONU to communicate with the optical link terminal. Assume that the fourth ONU is the ONU n1 shown in FIG. When the terminal has a communication requirement, the reflective semiconductor optical amplifier in the optical network unit n1 uses the third optical signal with the wavelength of the optical network unit n1 sent by the optical link terminal to the optical network unit n1 to transmit the The service information of the optical link terminal is modulated into a third optical signal having the wavelength of the optical network unit n1, and the third optical signal is sequentially sent to the The optical link terminal; the optical link terminal receives the third optical signal and performs corresponding processing.

While realizing the P2P communication between the optical network units, it can also realize the active communication between the optical network unit and the optical link terminal, that is, the optical network unit sends some specific service information to the optical link terminal.

Specifically, in practical applications, since the communication between the optical link terminal and the optical network unit usually has more traffic than the peer-to-peer communication between the optical network unit and the optical network unit, in order to avoid the optical link terminal The wavelength conflict with the downlink communication of the optical network unit and the P2P peer-to-peer communication between the optical network units can be used in a transmission cycle, and the first 80% of the transmission cycle is used for transmission between the optical link terminal and the optical network unit The last 20% of the transmission period is used to transmit P2P information between optical network units. As the demand for P2P communication in the network increases, the time ratio of P2P information flow transmission in the transmission period can be adjusted, for example, the first 60% of the transmission period is used for transmission between the optical link terminal and the optical network unit The last 40% of the transmission period is used to transmit P2P information between optical network units.

Specifically, in practical applications, the above-mentioned wavelength selective switch may be a bandwidth-variable wavelength selective switch based on liquid crystal on silicon, but of course it is not limited thereto.

In this solution, the optical distribution network and the optical network unit are improved, and the wavelength division multiplexing (WDM) and time division multiplexing (TDM) are combined to support the communication between the optical link terminal and the optical network unit at the same time Peer-to-peer communication with optical network units, and the bandwidth can be flexibly and dynamically changed according to the network load.

It should be noted that the "corresponding processing" in the above optical network unit and optical link terminal retaining the optical signal and performing corresponding processing is processing corresponding to service information, which is not specifically limited in the present invention.

It should be noted that, the above descriptions by taking the ONU 11 , ONU 1k , ONU n1 and ONU nk as examples are just a specific example of the present invention and do not constitute a limitation of the present invention.

By applying the embodiment shown in FIG. 1 of the present invention, P2P communication between optical network units in the optical access network is realized, communication efficiency is improved, and bandwidth is dynamically allocated.

In addition, an embodiment of the present invention also provides an optical access network system, as shown in FIG. 2 . FIG. 2 is a schematic structural diagram of an optical access network system provided by an embodiment of the present invention. The optical access network system can Including: optical link terminals, multiple optical network units divided into multiple groups, and optical distribution networks; wherein,

Each optical network unit includes an adjustable transmitter, a receiver, and a reflective semiconductor optical amplifier. The optical distribution network includes an intelligent remote node, an optical splitter, and a one-way conducting isolator. The intelligent remote node includes a coupling device, controller and wavelength selective switch, each group includes at least one optical network unit and shares one wavelength and one optical splitter, each optical network unit uniquely corresponds to a unidirectional conduction isolator, and the wavelength selective switch includes an input port and multiple output ports, each output port corresponds to a group;

The reflective semiconductor optical amplifier of the first optical network unit is configured to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler, wherein the REPORT frame includes the optical link The address of the terminal, the address of the first ONU, and the logical link identifier of the second ONU, where the logical link identifier of the second ONU is pre-stored in the first ONU, The first ONU and the second ONU are any two of a plurality of ONUs;

The optical link terminal is configured to generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and send the GATE frame Feedback to the first optical network unit, wherein the GATE frame includes at least the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link The terminal pre-stores the corresponding relationship between the logical link identifier and the wavelength of each optical network unit;

Specifically, in practical applications, the optical link terminal is provided with a flag used to indicate whether there are other optical network units currently performing P2P communication with the second optical network unit; the optical link terminal may specifically be used for:

According to the value of the flag, it is judged whether there is currently an ONU performing P2P communication with the second ONU, if not, according to the address of the first ONU included in the REPORT frame and the The logical link identifier of the second optical network unit, generating a GATE frame, and feeding back the GATE frame to the first optical network unit, and modifying the value of the flag to indicate that there are currently other optical network units with the The second optical network unit performs the marking of the P2P communication.

Specifically, in practical applications, the optical link terminal stores the weight value of the P2P communication between each optical network unit and the second optical network unit in each cycle; the optical link terminal can specifically be used for:

According to the stored weight value, determine whether the weight value of the P2P communication between the first optical network unit and the second optical network unit in the current period is the smallest value among the weight values stored in the optical link terminal, if yes , then generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feed back the GATE frame to the first ONU network unit.

The optical link terminal is also used to count the total amount of bandwidth required by each group in real time, and adjust the wavelength selection switch through the controller in the optical distribution network according to the total amount of bandwidth that is counted. The output channel range of the output port corresponding to each group and the bandwidth allocation of communication services by adjusting the wavelength selection switch through the controller in the optical distribution network;

The adjustable transmitter of the first optical network unit is configured to modulate the service information about the second optical network unit into a first optical signal having the wavelength of the second optical network unit, and transmit the second optical network unit sending an optical signal through the isolator to a coupler in the optical distribution network;

The coupler in the optical distribution network is used to couple the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the The output port corresponding to the second optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then under the function of the optical splitter, it is in the same position as the second optical network unit All optical network units of the group receive the first optical signal through their respective receivers;

The second optical network unit is configured to perform corresponding processing on the first optical signal.

In practical applications, the optical link terminal of the embodiment of the present invention is also used for:

modulating the traffic information about the third optical network unit into a second optical signal having the wavelength of the third optical network unit, and sending the second optical signal to a coupler of the optical distribution network, wherein , the third optical network unit is any one of a plurality of optical network units;

Couplers in optical distribution networks are also used for:

coupling the second optical signal into the input port of the wavelength selective switch, and after the second optical signal enters the wavelength selective switch, it is distributed to the corresponding output port of the third optical network unit based on The output channel range corresponding to the output port outputs the second optical signal, and then under the action of the optical splitter, all optical network units in the same group as the third optical network unit receive the signal through their respective receivers the second optical signal;

The third optical network unit is configured to retain the second optical signal and perform corresponding processing.

In practical applications, the above communication services may be: EF fast forwarding service, AF guaranteed forwarding service, BE best effort forwarding service and P2P peer-to-peer communication service.

In practical applications, the reflective semiconductor optical amplifier is further configured to transmit the third optical signal with the wavelength of the fourth optical network unit sent by the optical link terminal to the fourth optical network unit, Modulating the service information of the optical link terminal into a third optical signal having the wavelength of the fourth optical network unit, and passing the third optical signal through the optical splitter, the wavelength selective switch and the optical distribution network in sequence The coupler sends to the optical link terminal, wherein the fourth optical network unit is any one of a plurality of optical network units;

The optical link terminal is further configured to receive the third optical signal and perform corresponding processing.

By applying the embodiment shown in FIG. 2 of the present invention, P2P communication between optical network units in the optical access network is realized, communication efficiency is improved, and bandwidth is dynamically allocated.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a related manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, as for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment.

Those of ordinary skill in the art can understand that all or part of the steps in the implementation of the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, referred to herein as Storage media, such as: ROM/RAM, disk, CD, etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A bandwidth allocation method, characterized in that it is applied to an optical access network system, and the optical access network system includes: an optical link terminal, a plurality of optical network units and an optical distribution network divided into a plurality of groups ; Wherein, each optical network unit includes an adjustable transmitter, a receiver, and a reflective semiconductor optical amplifier, and the optical distribution network includes an intelligent remote node, an optical splitter, and a one-way conducting isolator, and the intelligent remote The node includes a coupler, a controller and a wavelength selective switch. Each group includes at least one optical network unit and shares one wavelength and one optical splitter. Each optical network unit uniquely corresponds to a one-way conducting isolator. The wavelength selective switch It includes an input port and a plurality of output ports, each output port corresponds to a group; and, the optical link terminal counts the total amount of bandwidth required by each group in real time, and according to the total bandwidth of the statistics, passes through the optical The controller in the distribution network adjusts the output channel range of the output port corresponding to each group of the wavelength selective switch, and adjusts the communication service of the wavelength selective switch through the controller in the optical distribution network The bandwidth is allocated; The methods include: When there is a communication requirement between the first ONU and the second ONU: The first optical network unit uses its own reflective semiconductor optical amplifier to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler, wherein the REPORT frame includes the optical link The address of the road terminal, the address of the first ONU, and the logical link identifier of the second ONU, the logical link identifier of the second ONU is pre-stored in the first ONU In the unit, the first optical network unit and the second optical network unit are any two of a plurality of optical network units; The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit, wherein the GATE frame includes at least the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link terminal pre-stores There is a corresponding relationship between the logical link identifier and the wavelength of each optical network unit; The first optical network unit uses its own adjustable transmitter to modulate the service information about the second optical network unit according to the received wavelength of the second optical network unit in the GATE frame to have a first optical signal at the wavelength of the second optical network unit, and sending the first optical signal to a coupler in the optical distribution network through the isolator; The coupler in the optical distribution network couples the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the second The output port corresponding to the optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then under the action of the optical splitter, all the optical network units in the same group as the second optical network unit Optical network units receive the first optical signals through respective receivers; The second optical network unit retains the first optical signal and performs corresponding processing, and other optical network units in the same group as the second optical network unit discard the first optical signal. 2. The method according to claim 1, characterized in that the method further comprises: When there is a communication requirement between the optical link terminal and the third optical network unit: The optical link terminal modulates the service information about the third optical network unit into a second optical signal having the wavelength of the third optical network unit, and sends the second optical signal to the optical wiring A coupler for a network, wherein the third ONU is any one of a plurality of ONUs; The coupler in the optical distribution network couples the second optical signal into the input port of the wavelength selective switch, and after the second optical signal enters the wavelength selective switch, it is distributed to the third The output port corresponding to the optical network unit outputs the second optical signal based on the output channel range corresponding to the output port, and then under the function of the optical splitter, all the optical network units in the same group as the third optical network unit Optical network units receive the second optical signals through respective receivers; The third optical network unit retains the second optical signal and performs corresponding processing, and other optical network units in the same group as the third optical network unit discard the second optical signal. 3. The method according to claim 1, characterized in that the method further comprises: When there is a communication requirement between the fourth optical network unit and the optical link terminal: The reflective semiconductor optical amplifier in the fourth optical network unit utilizes the third optical signal having the wavelength of the fourth optical network unit sent by the optical link terminal to the fourth optical network unit, and transmits The service information about the optical link terminal is modulated into a third optical signal having the wavelength of the fourth optical network unit, and the third optical signal is sequentially passed through the optical splitter and wavelength selection of the optical distribution network The switch and the coupler send to the optical link terminal, wherein the fourth optical network unit is any one of a plurality of optical network units; The optical link terminal receives the third optical signal and performs corresponding processing. 4. The method according to claim 1, wherein the communication service includes any one or a combination of the following services: EF fast forwarding service, AF guaranteed forwarding service, BE best effort forwarding service and P2P peer-to-peer communication service. 5. The method according to claim 1, wherein the optical link terminal is provided with a flag for indicating whether there are other optical network units currently communicating with the second optical network unit; The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit includes: The optical link terminal judges whether there is an optical network unit currently communicating with the second optical network unit according to the value of the flag, and if not, according to the first optical network unit included in the REPORT frame address and the logical link identifier of the second optical network unit, generate a GATE frame, and feed back the GATE frame to the first optical network unit, and modify the value of the flag to indicate that there are currently other optical network units A flag indicating that the network unit communicates with the second ONU. 6. The method according to claim 1, wherein the optical link terminal stores the weight value of each optical network unit communicating with the second optical network unit in each period; The optical link terminal generates a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feeds back the GATE frame to the The first optical network unit includes: The optical link terminal judges whether the weight value of the communication between the first optical network unit and the second optical network unit in the current cycle is the smallest among the weight values stored in the optical link terminal according to the stored weight value value, if yes, generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and feed back the GATE frame to the Describe the first optical network unit. 7. An optical access network system, characterized in that it comprises: Optical link terminals, a plurality of optical network units and optical distribution networks divided into a plurality of groups; wherein, Each optical network unit includes an adjustable transmitter, a receiver, and a reflective semiconductor optical amplifier. The optical distribution network includes at least an intelligent remote node, an optical splitter, and a one-way conducting isolator. The intelligent remote node includes Couplers, controllers and wavelength selective switches, each group includes at least one optical network unit and shares a wavelength and an optical splitter, each optical network unit uniquely corresponds to a unidirectional conduction isolator, and the wavelength selective switch includes a An input port and multiple output ports, each output port corresponds to a group; The reflective semiconductor optical amplifier of the first optical network unit is configured to send a REPORT frame to the optical link terminal through the wavelength selective switch and the coupler, wherein the REPORT frame includes the optical link The address of the terminal, the address of the first ONU, and the logical link identifier of the second ONU, where the logical link identifier of the second ONU is pre-stored in the first ONU, The first ONU and the second ONU are any two of a plurality of ONUs; The optical link terminal is configured to generate a GATE frame according to the address of the first ONU included in the REPORT frame and the logical link identifier of the second ONU, and send the GATE frame Feedback to the first optical network unit, wherein the GATE frame includes at least the address of the first optical network unit, the wavelength of the second optical network unit, and the bandwidth allocation of communication services, and the optical link The terminal pre-stores the corresponding relationship between the logical link identifier and the wavelength of each optical network unit; The optical link terminal is also used to count the total amount of bandwidth required by each group in real time, and adjust the wavelength selection switch through the controller in the optical distribution network according to the total amount of bandwidth that is counted. The output channel range of the output port corresponding to each group and the bandwidth allocation of communication services by adjusting the wavelength selection switch through the controller in the optical distribution network; The adjustable transmitter of the first optical network unit is configured to modulate the service information about the second optical network unit into a first optical signal having the wavelength of the second optical network unit, and transmit the second optical network unit sending an optical signal through the isolator to a coupler in the optical distribution network; The coupler in the optical distribution network is used to couple the first optical signal into the input port of the wavelength selective switch, and after the first optical signal enters the wavelength selective switch, it is distributed to the The output port corresponding to the second optical network unit outputs the first optical signal based on the output channel range corresponding to the output port, and then under the function of the optical splitter, it is in the same position as the second optical network unit All optical network units of the group receive the first optical signal through their respective receivers; The second optical network unit is configured to perform corresponding processing on the first optical signal.