CN116017211A

CN116017211A - Capacity expansion method, device, equipment and storage medium

Info

Publication number: CN116017211A
Application number: CN202111233677.6A
Authority: CN
Inventors: 唐海涛; 张强; 陈杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2023-04-25
Also published as: WO2023065817A1

Abstract

The application provides a capacity expansion method, device, equipment and storage medium, and belongs to the technical field of optical communication. The method is applied to a coherent light system, and the system comprises local point equipment and a plurality of access site equipment which are connected in an annular mode through optical fibers. Upon detecting a capacity expansion requirement of at least one access site device, a bandwidth required by each access site device is determined. The control office point device performs service communication with each access site device by using the subcarriers of the first wavelength, and reallocates the subcarriers of the second wavelength to each access site device based on the bandwidth required by each access site device. And notifying the local point equipment and each access station equipment to allocate subcarriers of the second wavelength for each access station equipment. By adopting the method and the device, when the capacity of the access site equipment is expanded, not only can the lossless capacity expansion be realized, but also the bandwidth of each access site equipment can be used with maximum efficiency.

Description

Capacity expansion method, device, equipment and storage medium

Technical Field

The present disclosure relates to the field of optical communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for capacity expansion.

Background

In recent years, in order to reduce the number of modules in a metropolitan area network, the metropolitan area network is switched from a Point-to-Point (P2P) system to a Point-to-multipoint (P2 MP) coherent optical system. The P2MP coherent optical system includes a Central Office (CO) device and a plurality of access point devices (APs), and the central office device is simply referred to as office device. In the P2MP coherent optical system, the local device and the APs are connected in series by an optical fiber, the frequency spectrum used by the local device to transmit data to the access site devices and the frequency spectrum used by the access site devices to transmit data to the local device are different, and the frequency spectrum used by each access site device is different (i.e. the subcarriers used by each access site device are different). Some services carried on the access site equipment may be upgraded, so that service data transmitted by the access site equipment may be increased, and then capacity expansion needs to be performed for the access site equipment, that is, available frequency spectrum is increased for the access site equipment.

In the prior art, when the capacity of the access site equipment is expanded, spectrum resources need to be redistributed, local oscillators of the sites need to be switched, and therefore the service is interrupted.

Disclosure of Invention

The application provides a capacity expansion method, device, equipment and storage medium, which not only can realize lossless capacity expansion of uninterrupted service, but also can further use the bandwidth of each access site equipment with maximum efficiency when the capacity of the access site equipment is expanded.

In a first aspect, the present application provides a method for capacity expansion, where the method is applied to a coherent optical system, the system includes a local point device and a plurality of access station devices, where the local point device and the plurality of access station devices are connected by an optical fiber ring, and the method includes: detecting capacity expansion requirements of at least one access site device in the plurality of access site devices, determining a bandwidth required by each access site device, controlling the local site device to perform service communication with each access site device based on subcarriers of a first wavelength, distributing subcarriers of a second wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the subcarriers of the second wavelength, and notifying the local site device and each access site device of the subcarriers of the second wavelength distributed to each access site device.

According to the scheme, the local point equipment and each access site equipment in the coherent optical system can use the subcarriers of the first wavelength and the subcarriers of the second wavelength to carry out service communication, when the capacity of a certain access site equipment is expanded, the local point equipment and each access site equipment use the subcarriers of the first wavelength to carry out service communication, so that the service is not interrupted, the subcarriers of the second wavelength which can be used by the access site equipment are redistributed, and the capacity expansion of the access site equipment is completed. In this way, traffic is not interrupted during capacity expansion, and the bandwidth of each access site device can be used most efficiently by reallocating subcarriers without having each access site device support the entire bandwidth of the office site device.

In one possible implementation manner, before controlling the local point device to perform service communication with each access station device based on the sub-carrier of the first wavelength, the method further includes: determining that the local point equipment and each access site equipment currently perform service communication based on the subcarrier of the second wavelength; the controlling the local point device to perform service communication with each access station device based on the sub-carrier of the first wavelength includes: allocating the sub-carrier of the first wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the sub-carrier of the first wavelength; the local point device is controlled to conduct business communication with each access site device based on the sub-carriers of the first wavelength allocated to each access site device.

According to the scheme, before the second-wavelength subcarriers are reassigned to each access site device, the local site device and each access site device are determined to perform service communication based on the second-wavelength subcarriers, the first-wavelength subcarriers are reassigned to each access site device, and the local site device and each access site device perform service communication by using the reassigned first-wavelength subcarriers. In this way, when the service communication is performed using the subcarrier of the second wavelength, the subcarrier of the first wavelength is reassigned first, and then the service communication is performed using the subcarrier of the first wavelength, so that it is not necessary to reassign the subcarrier of the first wavelength after reassigning the subcarrier of the second wavelength.

In one possible implementation manner, controlling the local point device to perform service communication with each access station device based on the sub-carrier of the first wavelength includes: controlling the local point equipment to carry out service communication with each access site equipment based on the subcarrier of the first wavelength currently allocated to each access site equipment; after informing the local point device and each access station device of the sub-carriers of the second wavelength allocated to each access station device, the method further includes: controlling the local point equipment and each access site equipment to perform service communication based on the subcarrier of the second wavelength allocated to each access site equipment; re-allocating the sub-carrier of the first wavelength to each access site device based on the bandwidth required by each access site device and the association relationship between each access site device and the sub-carrier of the first wavelength; notifying the local point device and each access station device of the sub-carriers of the first wavelength allocated for each access station device.

In the scheme shown in the application, before the subcarriers of the second wavelength are reassigned, the local point equipment and each access station equipment are directly controlled to use the subcarriers of the first wavelength for service communication. After the subcarriers of the second wavelength are reassigned, the local point equipment is controlled to carry out service communication with each access station equipment by using the reassigned subcarriers of the second wavelength, and the subcarriers of the first wavelength are reassigned. In this way, since the subcarriers of the second wavelength are reassigned first, the subcarriers of the second wavelength can be reassigned quickly.

In one possible implementation, the method further includes: and sending a capacity expansion completion message to the local point device and each access station device, wherein the capacity expansion completion message indicates that the subcarriers with the first wavelength and the subcarriers with the second wavelength can be used for service communication. In this way, the access station apparatus can select to use either the sub-carrier of the first wavelength or the sub-carrier of the second wavelength for traffic communication.

In one possible implementation manner, the allocating the subcarrier of the second wavelength to each access station device based on the bandwidth required by each access station device and the association relationship between each access station device and the subcarrier of the second wavelength includes: allocating a subcarrier of the second wavelength to each access site device based on the bandwidth required by each access site device and the subcarrier of the second wavelength supported by each access site device; alternatively, each access site device is allocated a subcarrier of the second wavelength based on the bandwidth required by each access site device, the subcarrier of the second wavelength supported by each access site device, and the subcarrier of the second wavelength currently allocated for each access site device.

In the scheme shown in the application, when the subcarriers with the second wavelength are allocated to each access site device, the bandwidth required by each access site device and the supported subcarriers with the second wavelength are considered, so that the subcarriers with the second wavelength allocated to each access site device can be used by each access site device. Or when the second wavelength subcarrier is allocated to each access station device, the second wavelength subcarrier currently used by each access station device is considered, so that the second wavelength subcarrier currently used by each access station device can be not adjusted as much as possible.

In one possible implementation manner, before the controlling the local point device and each access station device to perform service communication based on the sub-carrier of the first wavelength, the method further includes: it is determined that the sum of bandwidths required by the plurality of access station apparatuses is not higher than a bandwidth of a subcarrier of the second wavelength received by the local station apparatus. Therefore, when the local point equipment is ensured to support the capacity expansion of the access site equipment, the subcarriers with the second wavelength are reassigned, so that the capacity expansion success rate is high.

In one possible implementation, the method further includes: determining that the sum of bandwidths required by the plurality of access site devices is higher than the bandwidth of the subcarrier of the second wavelength received by the local site device; and controlling to increase the bandwidth of the sub-carrier of the second wavelength received by the local point device. Thus, when the local point equipment does not support the capacity expansion of the access site equipment, the hardware capacity expansion is carried out on the local point equipment.

In one possible implementation, the detecting the capacity expansion requirement of at least one access site device of the plurality of access site devices includes: determining that a capacity expansion requirement of the at least one access site device is detected when a capacity expansion request sent by the at least one access site device is received, the capacity expansion request indicating an increase in bandwidth or a required bandwidth of the at least one access site device; or, determining that a capacity expansion requirement of the at least one access site device is detected when a traffic upgrade notification is received, the traffic upgrade notification indicating an amount of bandwidth increase or a required bandwidth of the at least one access site device.

According to the scheme, the capacity expansion requirement of at least one access site device can be detected in various modes, so that the mode of detecting the capacity expansion requirement is more flexible.

In a second aspect, the present application provides a capacity expanding device having the functionality to implement the first aspect or any of the alternatives of the first aspect. The apparatus comprises at least one module for implementing the method of expansion provided in the first aspect or any of the alternatives of the first aspect.

In a third aspect, the present application provides a capacity expansion device, the device comprising a processor and a memory, wherein the memory has stored therein computer instructions; the processor executes the computer instructions to cause the apparatus to perform the method of expanding a volume provided in the first aspect or any of the alternatives of the first aspect.

In a fourth aspect, the present application provides a computer readable storage medium having stored therein at least one computer instruction that is readable by a processor to cause a capacity expanding device to perform the method of expanding capacity provided in the first aspect or any of the alternatives of the first aspect.

In a fifth aspect, the present application provides a computer program product comprising computer instructions stored in a computer readable storage medium. The processor of the capacity expanding device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the capacity expanding device performs the capacity expanding method provided in the first aspect or any of the alternatives of the first aspect.

Drawings

FIG. 1 is a schematic diagram of a prior art office point device in communication with an access site device;

FIG. 2 is a schematic diagram of a coherent light system provided in one exemplary embodiment of the present application;

FIG. 3 is a schematic diagram of a coherent light system provided in one exemplary embodiment of the present application;

FIG. 4 is a schematic diagram of a coherent optical system according to an exemplary embodiment of the present application;

FIG. 5 is a schematic diagram of service communication using a coherent optical system according to an exemplary embodiment of the present application;

FIG. 6 is a schematic diagram of an apparatus provided in an exemplary embodiment of the present application;

FIG. 7 is a flow chart of a method of expanding capacity provided in an exemplary embodiment of the present application;

FIG. 8 is a flow chart of a method of expanding capacity provided in an exemplary embodiment of the present application;

FIG. 9 is a flow chart of a method of expanding capacity provided in an exemplary embodiment of the present application;

fig. 10 is a schematic diagram of reallocating subcarriers of a first wavelength provided in an exemplary embodiment of the present application;

fig. 11 is a schematic diagram of reallocating subcarriers of a second wavelength provided in an exemplary embodiment of the present application;

fig. 12 is a schematic structural diagram of a capacity expansion device according to an exemplary embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In recent years, in order to reduce the number of modules in a metropolitan area network, the metropolitan area network is switched from a P2P system to a P2MP coherent optical system. The P2P system is a system composed of a plurality of office point devices and access site devices, the number of the office point devices is the same as the number of the access site devices, and one office point device and one access site device perform service communication. Fig. 1 provides a schematic diagram of a P2MP coherent optical system, which includes a local device and a plurality of access point devices, where the local device is in traffic communication with the plurality of access point devices, thus reducing the number of local devices.

In the P2MP coherent optical system, the local device and the multiple access site devices are connected in series through an optical fiber, and the frequency spectrum used by the local device to send data to the multiple access site devices is different from the frequency spectrum used by the multiple access site devices to send data to the local device, and the frequency spectrum used by each access site device is different (i.e. the subcarriers used by each access site device are different). In the operation process of the P2MP coherent optical system, some services carried on the access site equipment may be upgraded, so that service data transmitted by the access site equipment may be increased, and then expansion needs to be performed on the access site equipment, and when expansion is performed on the access site equipment, idle subcarriers are selected for the access site equipment to perform expansion. In this way, since the idle subcarriers at different times may be different, the coherent receiver of each access site device needs to cover the entire bandwidth of the local point device, so that some bandwidths of the access site devices may not be used all the time, resulting in bandwidth waste.

In the application, two communication paths are formed between the local point device and each access site device in the coherent optical system to enable service communication, and when the capacity of a certain access site device is expanded, one communication path is used by the local point device and each access site device to enable service communication to be carried out, so that the service is not interrupted. Reassigning subcarriers (which may also be referred to as reassigning spectrum) available to the access point device on another communication path, and then performing traffic communication on the communication path where the reassigned subcarriers are used by the local point device and each access point device to complete capacity expansion for the access point device. In this way, traffic is not interrupted during capacity expansion, and the bandwidth of each access site device can be used most efficiently by reallocating subcarriers without having each access site device support the entire bandwidth of the office site device.

The following describes the P2MP coherent light system referred to in the embodiments of the present application, and for simplicity of description, the subsequent P2MP coherent light system is simply referred to as a coherent light system.

Fig. 2 provides a schematic diagram of a coherent light system according to an embodiment of the present application. As shown in fig. 2, the coherent optical system includes a local point device 100 and a plurality of access site devices 200 (only 8 access site devices 200 are shown in fig. 2, and the number of the access site devices 200 is not limited in the embodiment of the present application), and the local point device 100 and the plurality of access site devices 200 are connected in series by two optical fibers, where the local point device 100 and the plurality of access site devices 200 are connected in series to form a ring, and the networking mode of connecting in series to form a ring is called horseshoe ring networking. The two optical fibers are referred to as an outer ring optical fiber and an inner ring optical fiber, respectively. The office point device 100 may be referred to as an office end node device, a master node device, or the like, and the access station device 200 may be referred to as a leaf station device, a slave node device, or the like. Each access site device 200 includes two transceiver components, both of which are connected to two optical fibers. The two transceiving means comprises a first transceiving means for performing traffic communication with the local point device 100 using a subcarrier of a first wavelength and a second transceiving means for performing traffic communication with the local point device 100 using a subcarrier of a second wavelength. That is, the office point apparatus 100 has two communication paths with the plurality of access point apparatuses 200, a first communication path of the two communication paths uses a subcarrier of a first wavelength for traffic communication, and a second communication path uses a subcarrier of a second wavelength for traffic communication. When the office point device 100 communicates with the plurality of access point devices 200 using the first communication path, downlink communication is performed through the outer ring optical fiber, uplink communication is performed through the inner ring optical fiber, the downlink communication means that the office point device 100 transmits data to the access point device 200, and the uplink communication means that the access point device 200 transmits data to the office point device 100. When the local station device 100 communicates with the plurality of access point devices 200 using the second communication path, downstream communication is performed through the inner ring optical fiber, and upstream communication is performed through the outer ring optical fiber. Alternatively, when the local station device 100 communicates with the plurality of access point devices 200 using the first communication path, downstream communication is performed through the inner ring optical fiber, and upstream communication is performed through the outer ring optical fiber. When the office point device 100 communicates with the plurality of access point devices 200 using the second communication path, downstream communication is performed through the outer ring optical fiber, and upstream communication is performed through the inner ring optical fiber. The former method will be described later as an example. The frequency spectrum of each subcarrier of the first wavelength does not overlap and the frequency spectrum of each subcarrier of the second wavelength does not overlap. The first wavelength and the second wavelength are both single wavelengths.

In the coherent optical system shown in fig. 2, in one implementation, the office point apparatus 100 includes a first sub office point apparatus 101 and a second sub office point apparatus 102, see the coherent optical system shown in fig. 3. As shown in fig. 3, the first sub-office point apparatus 101 performs traffic communication with each access station apparatus 200 using a subcarrier of a first wavelength, and the second sub-office point apparatus 102 performs traffic communication with each access station apparatus 200 using a subcarrier of a second wavelength. Here, each of the sub-office apparatuses corresponds to one office apparatus, and the first sub-office apparatus 101 and the second sub-office apparatus 102 are backed up with each other. In addition, the office point device 100 further includes a network element electrical layer board, where the network element electrical layer board is connected to the first sub office point device 101 and the second sub office point device 102 respectively. The network element electrical layer board can select to receive data sent by the access site device 200 from the first sub-office point device 101 or from the second sub-office point device 102.

In another implementation, the local device 100 includes a primary transceiver module and a backup transceiver module. The main transceiver module performs service communication with each access site device 200 using a subcarrier of a first wavelength, and the standby transceiver module performs service communication with each access site device 200 using a subcarrier of a second wavelength, where the main transceiver module and the standby transceiver module are mutually backed up. In addition, the local point device 100 further includes a network element electrical layer board, where the network element electrical layer board is connected to the main transceiver module and the standby transceiver module respectively. The network element electrical layer board can select to receive data sent by the access site device 200 from the master transceiver module or from the slave transceiver module.

In another implementation, the office point device 100 includes a transceiver module that communicates with each access site device 200 using a subcarrier of a first wavelength and communicates with each access site device using a subcarrier of a second wavelength.

Illustratively, the embodiment of the present application further provides a structure that the local point device 100 includes a first sub-local point device 101 and a second sub-local point device 102.

The first sub-office apparatus 101 includes a first light source module 1011, a first receiving module 1012, a first transmitting module 1013, and a first optical digital signal processing (optical digital signal process, oDSP) 1014. The first light source module 1011 is connected to the first receiving module 1012 and the first transmitting module 1013 via optical fibers, respectively. The first receiving module 1012 is connected to the inner ring optical fiber, and the first transmitting module 1013 is connected to the outer ring optical fiber. The first oDSP1014 is connected to a first receiving module 1012 and a first transmitting module 1013, respectively. The first light source module 1011 includes a first laser and a first 1×2 optical coupler, the first laser and the first 1×2 optical coupler are connected by optical fibers, and the first 1×2 optical coupler is connected to the first receiving module 1012 and the first transmitting module 1013 by optical fibers, respectively. The first laser is configured to emit light at a first wavelength.

The second sub-office apparatus 102 includes a second light source module 1021, a second receiving module 1022, a second transmitting module 1023, and a second oDSP1024. The second light source module 1021 is connected to the second receiving module 1022 and the second transmitting module 1023 via optical fibers, respectively. The second receiving module 1022 is connected to the outer ring optical fiber, and the second transmitting module 1023 is connected to the inner ring optical fiber. The second oddsp 1024 is connected to the second receive module 1022 and the second transmit module 1023, respectively. The second light source module 1021 includes a second laser and a second 1×2 optical coupler, the second laser and the second 1×2 optical coupler are connected through optical fibers, and the second 1×2 optical coupler is connected to the second receiving module 1022 and the second transmitting module 1023 through optical fibers, respectively. The second laser is configured to emit light at a second wavelength.

Illustratively, the present application also provides for an architecture in which the access site apparatus 200 includes a first transceiver component 201 and a second transceiver component 202.

The first transceiver 201 includes a first beam splitter 2011, a third light source module 2012, a first beam combiner 2013, a third receiving module 2014, a third transmitting module 2015, and a third oDSP2016. The first beam splitter 2011 is connected to the outer ring optical fiber, and the first beam splitter 2011 is connected to the third receiving module 2014 through an optical fiber. The third light source module 2012 is connected to the third receiving module 2014 and the third transmitting module 2015 by optical fibers, respectively. The third transmitting module 2015 is connected to the first beam combiner 2013. The first combiner 2013 is connected to an inner ring fiber. The third light source module 2012 includes a third laser and a third 1×2 optical coupler, the third laser is connected to the third 1×2 optical coupler by an optical fiber, and the third 1×2 optical coupler is connected to the third receiving module 2014 and the third transmitting module 2015 by optical fibers, respectively. The third laser is configured to emit light at a third wavelength. The third wavelength includes a center wavelength of at least one of the subcarriers of the first wavelength. The third oDSP2016 is connected to a third receiving module 2014 and a third transmitting module 2015, respectively. When the access station equipment works simultaneously, the third wavelength corresponding to each access station equipment is different.

The second transceiver 202 includes a second beam splitter 2021, a fourth light source module 2022, a second beam combiner 2023, a fourth receiving module 2024, a fourth transmitting module 2025, and a fourth oddsp 2026. The second beam splitter 2021 is connected to an inner ring optical fiber, and the second beam splitter 2021 is connected to the fourth receiving module 2024 through an optical fiber. The fourth light source module 2022 is connected to the fourth receiving module 2024 and the fourth transmitting module 2025, respectively. The fourth transmission module 2025 is connected to the second beam combiner 2023. The second combiner 2023 is connected to the outer ring optical fiber. The fourth light source module 2022 includes a fourth laser and a fourth 1×2 optical coupler, the fourth laser and the fourth 1×2 optical coupler are connected by optical fibers, and the fourth 1×2 optical coupler is connected to the fourth receiving module 2024 and the fourth transmitting module 2025 by optical fibers, respectively. The fourth laser is configured to emit light at a fourth wavelength. The fourth wavelength includes a center wavelength of at least one of the subcarriers of the second wavelength. The fourth oDSP2026 is connected to a fourth receiving module 2024 and a fourth transmitting module 2025, respectively. When the access station equipment works simultaneously, the fourth wavelength corresponding to each access station equipment is different.

The first beam splitter 2011 is connected to the second beam combiner 2023 via an optical fiber, and the second beam splitter 2021 is connected to the first beam combiner 2013 via an optical fiber.

The schematic structure of the office point apparatus 100 and the access station apparatus 200 described above is shown in fig. 4. There are a plurality of access site devices 200 between the first sub-site device 101 and the second sub-site device 102, only one access site device 200 being shown in fig. 4.

In addition, the access site device 200 further includes a network element electrical layer board, where the network element electrical layer board is connected to the first transceiver 201 and the second transceiver 202, respectively, and obtains data from the first transceiver 201 or the second transceiver 202. The network element electrical layer board can control the third oDSP2016 to adjust the wavelength of the light emitted by the third light source module 2012. The network element electrical layer board can also control the fourth oDSP2026 to adjust the wavelength of the light emitted by the fourth light source module 2022.

Fig. 5 provides a process in which a first sub-office point apparatus 101 performs traffic communication with a plurality of access station apparatuses 200 using a first communication path on the basis of the office point apparatus 100 and the access station apparatuses 200 shown in fig. 4. The first light source module 1011 supplies light of a first wavelength to the first receiving module 1012 and the first transmitting module 1013, the first receiving module 1012 uses the light of the first wavelength as local oscillation light, and the first transmitting module 1013 uses the light of the first wavelength as signal light. For example, the first laser emits light of a first wavelength, and is split into two paths by the first 1×2 optical coupler, and transmitted to the first receiving module 1012 and the first transmitting module 1013, respectively. The third light source module 2012 provides light of a third wavelength to the third receiving module 2014 and the third transmitting module 2015, the third receiving module 2014 uses the light of the third wavelength as local oscillation light, and the third transmitting module 2015 uses the light of the third wavelength as signal light. For example, the third laser emits light of a third wavelength, and is split into two paths through a third 1×2 optical coupler, and transmitted to the third receiving module 2014 and the third transmitting module 2015, respectively. The third wavelength is the same as the center wavelength of the subcarrier received by the access site device 200 from the office site device.

The downlink communication process comprises the following steps: the first transmitting module 1013 modulates data transmitted to each access site device 200 onto light of a first wavelength using a multi-carrier modulation technique, and obtains multi-subcarriers of the first wavelength, where the data of each access site device 200 corresponds to at least one subcarrier. The first transmission module 1013 then transmits the multi-sub-carriers of the first wavelength to the outer-loop optical fiber. The first splitter 2011 receives the first wavelength multi-subcarrier from the outer ring optical fiber, divides the first wavelength multi-subcarrier into two beams, and sends the two beams to the third receiving module 2014 and the second combiner 2023, where the division of the first wavelength multi-subcarrier into two beams divides the first wavelength multi-subcarrier into two beams according to power. The third receiving module 2014 uses the light with the third wavelength as local oscillation light, and coherently receives the sub-carrier corresponding to the light to obtain the data sent to the light by the first sub-local point device 101. The second beam combiner 2023 receives the sub-carriers belonging to the second wavelength from the fourth transmitting module 2025, receives the multi-sub-carriers of the first wavelength from the first beam splitter 2011, combines the received two signals into one signal, and transmits the signal from the outer ring optical fiber to the first receiving section 201 of the next access station apparatus 200.

Uplink communication process: when each access site device 200 transmits data to the first sub-office device 101, the third transmitting module 2015 modulates the data onto signal light of a third wavelength provided by itself, and obtains at least one subcarrier of the first wavelength. The third transmission module 2015 transmits at least one subcarrier of the first wavelength to the first beam combiner 2013. The first combiner 2013 receives at least one subcarrier at the first wavelength and receives the signal sent by the second beam splitter 2021, possibly including multiple subcarriers at the second wavelength (the signal that is down by the second beam splitter 2021) and at least one subcarrier at the first wavelength (the signal that is up by the other access site device 200), and combines the received two signals into one path signal for transmission to the inner ring fiber. At least one subcarrier of the first wavelength transmitted by the plurality of access point devices 200, upon reaching the first sub-office point device 101, constitutes a plurality of subcarriers of the first wavelength. The first receiving module 1012 uses the light of the first wavelength as the local oscillation light, and coherently receives the multi-sub-carriers of the first wavelength. The first oDSP1014 obtains data transmitted by the plurality of access site devices 200 by filtering. Here, since the first sub-local device 101 does not provide local oscillation light of the second wavelength, data on the sub-carrier of the second wavelength is not obtained even if the sub-carrier of the second wavelength is received.

In fig. 5, three access site devices 200 are shown, the three access site devices 200 respectively using sub-carrier 1, sub-carrier 2 and sub-carrier 3 of the first wavelength for traffic communication with the first sub-office point device 101. And, the three access site devices 200 perform traffic communication with the second sub-office point device 102 using the sub-carrier 4, the sub-carrier 5, and the sub-carrier 6 of the second wavelength, respectively. Through the communication process shown in fig. 5, the local point device 100 and the access station device 200 can perform service communication with the subcarrier of the second wavelength through the subcarrier of the first wavelength, which is only an alternative manner, and the embodiment of the present application is not limited.

The bandwidth of the first sub-office point device 101 for receiving the sub-carrier of the first wavelength is the same as the bandwidth of the second sub-office point device 102 for receiving the sub-carrier of the second wavelength. Likewise, the bandwidth of the sub-carrier of the first wavelength received by the main transceiver module is the same as the bandwidth of the sub-carrier of the second wavelength received by the standby transceiver module.

The execution body of the method of expansion is described below.

The execution main body of the capacity expansion method can be a capacity expansion device, which is called a capacity expansion device for short. Alternatively, the capacity expansion device is a hardware device, for example, the hardware device is the local device 100, or the hardware device is an upper layer device (may be considered as a management device) of the local device 100, which may be referred to as a capacity expansion device. Alternatively, the capacity expansion device is a software device, such as the capacity expansion device operates in the local device 100, or the capacity expansion device operates in an upper layer device of the local device 100.

The following describes a hardware configuration when the capacity expansion device is a hardware device, and the apparatus 600 described below is the above-mentioned upper layer apparatus, local point apparatus 100, and the like.

As shown in fig. 6, device 600 may alternatively be implemented by a general bus architecture. The device 600 includes at least one processor 601, a communication bus 602, a memory 603, and at least one network interface 604.

The processor 601 is, for example, a general-purpose central processing unit (central processing unit, CPU), a network processor (network processer, NP), a graphics processor (graphics processing unit, GPU), a neural-network processor (neural-network processing units, NPU), a data processing unit (data processing unit, DPU), a microprocessor, or one or more integrated circuits for implementing the aspects of the present application. For example, the processor 601 includes an application-specific integrated circuit (ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof. PLDs are, for example, complex programmable logic devices (complex programmable logic device, CPLD), field-programmable gate arrays (field-programmable gate array, FPGA), general-purpose array logic (generic array logic, GAL), or any combination thereof.

Communication bus 602 is used to transfer information between the components described above. The communication bus 602 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 6, but not only one bus or one type of bus.

The Memory 603 is, for example, but not limited to, a read-only Memory (ROM) or other type of static storage device that can store static information and instructions, as well as a random access Memory (random access Memory, RAM) or other type of dynamic storage device that can store information and instructions, as well as an electrically erasable programmable read-only Memory (electrically erasable programmable read-only Memory, EEPROM), compact disc read-only Memory (compact disc read-only Memory) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media, or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 603 is, for example, independent and is connected to the processor 601 via a communication bus 602. The memory 603 may also be integrated with the processor 601.

Optionally, the memory 603 is used to store the subcarriers used by each access site device.

The network interface 604 uses any transceiver-like device for communicating with other devices or communication networks. Network interface 604 includes a wired network interface and may also include a wireless network interface. The wired network interface may be, for example, an ethernet interface. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless network interface may be a wireless local area network (wireless local area networks, WLAN) interface, a network interface of a cellular network, a combination thereof, or the like.

In a particular implementation, as an example, the processor 601 may include one or more CPUs.

In a particular implementation, as an example, the device 600 may include multiple processors. Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In some embodiments, the memory 603 is used to store program code 6031 that performs the method of expansion in the present application, and the processor 601 executes the program code 6031 stored in the memory 603. That is, the apparatus 600 may implement the method of capacity expansion provided by the method embodiment through the processor 601 and the program code 6031 in the memory 603.

In the following description, a flow of a capacity expansion method is described, and fig. 7 provides a schematic flow diagram of a capacity expansion method, and in fig. 7, an upper layer device of a capacity expansion device is taken as an example of a local point device 100, hereinafter referred to as a local point device 100, and an access station device is referred to as an access station device 200.

In step 701, a capacity expansion requirement of at least one access site device of a plurality of access site devices is detected, and a bandwidth required by each access site device is determined.

In this embodiment, during the process of communication between the local point device and the plurality of access station devices, the capacity expansion device can detect the capacity expansion requirement of at least one access station device. The capacity expansion means determines an amount of bandwidth increase required by the at least one access site device. The capacity expansion device acquires the bandwidth required by each access site device last time, and increases the corresponding bandwidth increment on the basis of the bandwidth required by the at least one access site device last time, so as to acquire the bandwidth required by the at least one access site device, while the bandwidths required by other access site devices except the at least one access site device are unchanged. Alternatively, the capacity expansion means determines the bandwidth required by the at least one access site device and obtains the bandwidth required by the other access site device last time. In this way, the expansion means determine the bandwidth required by each access site device.

It should be noted that, after each bandwidth adjustment, the capacity expansion device records the bandwidth required by each access station device. Optionally, the capacity expansion device may not record the bandwidth required by each access site device, and when performing capacity expansion processing each time, the capacity expansion device issues a bandwidth acquisition notification to the local site device, and the local site device requests the bandwidth required by other access site devices except for at least one access site device, and sends the requested bandwidth to the capacity expansion device.

Illustratively, the capacity expansion device in step 701 detects the capacity expansion requirement of at least one access site device in a plurality of ways, and two possible ways are provided below.

In one mode, when a capacity expansion request sent by at least one access site device is received, it is determined that a capacity expansion requirement of the at least one access site device is detected, and the capacity expansion request indicates an increase amount of bandwidth required or a required bandwidth of the at least one access site device.

In this embodiment, when a certain access site device needs to perform service upgrade, the access site device sends a capacity expansion request to a local device through a subcarrier of a first wavelength and a subcarrier of a second wavelength, where the capacity expansion request carries an address of a capacity expansion device, and the capacity expansion request carries a bandwidth or a bandwidth increment required after service upgrade, where the required bandwidth is a bandwidth required by the access site device to transmit data after service upgrade, and the required bandwidth increment is a bandwidth increment brought by service upgrade. For example, the current office point device allocates a bandwidth of 50G to the access station device, and after service upgrade, a bandwidth of 100G is required, and after service upgrade, a bandwidth required for service upgrade is 100G, and an increase amount of bandwidth required for service upgrade is 50G. The network element electrical layer veneer of the local point equipment acquires a capacity expansion request sent by the access site equipment from a subcarrier of a first wavelength or a subcarrier of a second wavelength (namely from the first sub-local point equipment or the second sub-local point equipment), and then forwards the capacity expansion request to a capacity expansion device. After receiving the capacity expansion request, the capacity expansion device determines that the access site equipment needs to increase bandwidth, and obtains the bandwidth or the bandwidth increase amount needed after service upgrading in the capacity expansion request. In this way, the capacity expansion means detects the capacity expansion requirement of at least one access site device.

In a second manner, when a service upgrade notification is received, it is determined that a capacity expansion requirement of at least one access site device is detected, the service upgrade notification indicating an increase in bandwidth or a required bandwidth of the at least one access site device.

In this embodiment, during service upgrade, the manager inputs a service upgrade notification to the capacity expansion device, where the service upgrade notification includes a bandwidth or an increase in bandwidth required by at least one access site device, where the at least one access site device is an access site device that needs to increase bandwidth. And after receiving the service upgrading notification, the capacity expansion device determines that the capacity expansion requirement of the at least one access site device is detected.

Or, at the time of service upgrade, the upper layer service management device sends a service upgrade notification to the capacity expansion device, where the service upgrade notification includes a bandwidth or an increase amount of bandwidth required by at least one access site device. And after receiving the service upgrading notification, the capacity expansion device determines that the capacity expansion requirement of the at least one access site device is detected.

It should be noted that the foregoing is only two possible implementations, and the embodiments of the present application are not limited thereto.

In step 702, the local point device is controlled to perform service communication with each access station device based on the sub-carrier of the first wavelength.

In this embodiment, the capacity expansion device sends a notification to the local point device, so that the network element electrical layer board of the local point device selects to receive data on the subcarrier with the first wavelength (i.e. selects to receive data received by the first sub-local point device), and the network element electrical layer board of each access site device selects to receive data on the subcarrier with the first wavelength (i.e. selects to receive data sent by the first sub-local point device). In the communication process, the local point equipment modulates the data of each access site equipment to signal light with a first wavelength, obtains multi-subcarriers with the first wavelength, and sends the multi-subcarriers with the first wavelength to each access site equipment. Each access station device transmits data to the local station device using a subcarrier at the first wavelength.

In addition, the local point device may modulate the data of each access station device onto the signal light with the second wavelength, obtain the multi-subcarrier with the second wavelength, and send the multi-subcarrier with the second wavelength to each access station device. And each access station device also transmits data to the local station device using the sub-carrier of the second wavelength. In this way, a backup of the data transmission can be achieved.

Step 703, allocating a subcarrier of the second wavelength to each access station device based on the bandwidth required by each access station device and the association relationship between each access station device and the subcarrier of the second wavelength.

In this embodiment, the capacity expansion device obtains an association relationship between each access station device and a subcarrier of the second wavelength. The association indicates a subcarrier of the second wavelength supported by each access site device or the association indicates a subcarrier of the second wavelength supported by each access site device and a subcarrier of the second wavelength currently allocated to each access site device. The sub-carrier of the second wavelength supported by each access site device refers to a sub-carrier that each access site device can coherently receive data, and can also be considered as a sub-carrier obtained by modulating data on signal light of the fourth wavelength. The subcarriers of the second wavelength currently allocated to each access site device belong to subcarriers of the second wavelength supported by each access site device.

The capacity expansion device uses the bandwidth required by each access site device and the association relation to allocate the sub-carrier of the second wavelength to each access site device. The bandwidth of the sub-carriers of the second wavelength allocated to each access site device is greater than or equal to the bandwidth required by each access site device.

Step 704, notifying the local point device and each access station device of the sub-carriers of the second wavelength allocated for each access station device.

In this embodiment, the capacity expansion device sends a subcarrier adjustment notification to the local point device after allocating subcarriers of the second wavelength to each access station device. The local point device acquires the subcarrier with the second wavelength allocated to each access site device from the subcarrier adjustment notice, and records the subcarrier with the second wavelength allocated to each access site device. The subcarrier adjustment notification carries a corresponding relationship between an identifier of each access site device and a subcarrier of a second wavelength and a first identifier, where the first identifier indicates subcarrier adjustment of communication by a second transceiver component of the access site device, and further indicates a second substation point device or a spare transceiver module to record subcarriers of the second wavelength allocated to each access site device. Where the office point device includes a first sub office point device and a second sub office point device, the second sub office point device records sub carriers of a second wavelength allocated for each access site device. When the local point device comprises a main transceiver module and a standby transceiver module, the standby transceiver module records the sub-carriers of the second wavelength allocated to each access site device.

And the local point equipment adopts a multi-carrier modulation technology to modulate the subcarrier adjustment notification to the signal light with the first wavelength, so as to obtain multi-subcarriers with the first wavelength. Each access station device modulates a subcarrier adjustment notification on at least one subcarrier of a first wavelength currently in use. The local point device transmits multiple sub-carriers of a first wavelength to the outer ring fiber. The first transceiver component of each access site device receives multiple subcarriers of a first wavelength from the outer ring optical fiber, and the first transceiver component of each access site device coherently receives the subcarriers of the first wavelength corresponding to the first transceiver component of each access site device to obtain subcarrier adjustment notification. The network element electric layer single board of each access site device receives the subcarrier adjustment notice from the first receiving and transmitting component, and acquires the subcarrier of the second wavelength allocated to the network element electric layer single board and the first identifier from the subcarrier adjustment notice. The network element electrical layer single board of each access site device sends a notification to the second transceiver component, so that local oscillation light and signal light of the second transceiver component are adjusted to correspond to target subcarriers, and for any access site device, the target subcarriers are subcarriers of a second wavelength allocated to the access site device. Each access station device then also transmits an adjustment complete message to the local station device using the sub-carrier of the first wavelength. And after receiving the adjustment completion message sent by each access site device, the local point device sends the adjustment completion message to the capacity expansion device. The subsequent office point device and the access station device may communicate using the reassigned subcarriers of the second wavelength.

In addition, the local point device may further modulate the subcarrier adjustment notification onto the signal light with the second wavelength by using a multicarrier modulation technique, so as to obtain a multicarrier with the second wavelength. The at least one subcarrier of the second wavelength currently used by each access station apparatus is modulated with a subcarrier adjustment notification, where "currently used" refers to a subcarrier that has not yet been switched to reassignment. The local point device transmits the multi-subcarrier at the second wavelength to the inner loop fiber. The second transceiver component of each access site device receives multiple subcarriers of a second wavelength from the inner ring optical fiber, and the second transceiver component of each access site device coherently receives the subcarriers of the second wavelength corresponding to the second transceiver component of each access site device to obtain subcarrier adjustment notification. In this way, even if the network element electrical layer board of each access site device cannot acquire the subcarrier adjustment notification from the first transceiver component, the network element electrical layer board of each access site device can acquire the subcarrier adjustment notification from the second transceiver component, so that the reliability of transmitting the subcarrier adjustment notification is higher. In addition, each access station device may also send the adjustment completion message to the local station device through a subcarrier of the second wavelength, where the subcarrier of the second wavelength may be a reallocated subcarrier of the second wavelength, or may be a subcarrier of the second wavelength that is currently used.

Based on the above description, by adopting the scheme of the application, when the capacity of the access site equipment is expanded, the service communication is adjusted to one of two communication paths, so that the service communication is kept uninterrupted. Each access station device is then reassigned subcarriers on another communication path and subsequent traffic communications may use the reassigned subcarriers' communication paths. It can be seen that not only can traffic communication continue while capacity expansion is performed for the access site devices, but also the bandwidth of each access site device can be used most efficiently by reallocating the sub-carriers without having each access site device support the entire bandwidth of the office site device.

The flow shown in fig. 7 will be described in detail.

In the flow shown in fig. 7, step 702 can be implemented in a variety of ways, and the capacity expansion flows of fig. 8 and 9 are provided based on the different processing manners of step 702. In fig. 8, first, the access point device is reassigned subcarriers of the first wavelength, and the local point device performs traffic communication with each access point device using the reassigned subcarriers of the first wavelength. In fig. 9, the service communication is switched to the use of the subcarrier with the first wavelength currently allocated to each access site device, and after the subcarrier with the second wavelength is reallocated to the plurality of access site devices, the subcarrier with the first wavelength is reallocated to the plurality of access site devices, so that the backup is realized.

The flow of the method of expansion shown in fig. 8 is as follows.

Step 801, detecting a capacity expansion requirement of at least one access site device of a plurality of access site devices, and determining a bandwidth required by each access site device.

The processing in step 801 is referred to as processing in step 701, and will not be described here.

Step 802, determining whether the sum of bandwidths required by the plurality of access station apparatuses is higher than the bandwidth of the subcarrier of the second wavelength received by the local station apparatus.

In this embodiment, after the capacity expansion device obtains the bandwidth required by each access site device, the sum of the bandwidths required by all the access site devices is calculated. The capacity expansion device acquires the bandwidth of the stored sub-carrier wave of the second wavelength received by the local point equipment, and judges the size relation between the sum of the bandwidths and the bandwidth of the sub-carrier wave of the second wavelength received by the local point equipment.

Step 803, if the sum of bandwidths required by the plurality of access site devices is not higher than the bandwidth of the subcarrier with the second wavelength received by the local point device, and it is determined that the local point device and each access site device currently perform service communication based on the subcarrier with the second wavelength, and the subcarrier with the first wavelength is allocated to each access site device based on the bandwidth required by each access site device and the association relationship between each access site device and the subcarrier with the first wavelength; the control office point device is in traffic communication with each access station device based on the sub-carriers of the first wavelength allocated to each access station device.

In this embodiment, if the sum of bandwidths required by the plurality of access site devices is not higher than the bandwidth of the subcarrier of the second wavelength received by the local point device, it is indicated that the local point device can also carry the service communication after the capacity expansion of the plurality of access site devices, and more subcarriers can be reallocated for the access site device that needs to be expanded by reallocating the subcarrier of the second wavelength. For example, the sum of bandwidths required by the multiple access site devices is 380G, and the bandwidth of the subcarrier of the local site device for receiving the second wavelength is 400G, which indicates that the local site device can also carry the service communication after the capacity expansion of the multiple access site devices. Here, since the bandwidth of the local point device for receiving the subcarrier of the first wavelength is the same as the bandwidth of the subcarrier of the second wavelength, the sum of bandwidths required by the plurality of access point devices is not higher than the bandwidth of the local point device for receiving the subcarrier of the first wavelength.

The capacity expansion device determines that the local point equipment and each access site equipment currently carry out service communication based on the subcarriers of the second wavelength. For example, the sub-carrier of the second wavelength is used for primary communication, and in normal cases, the local point device and each access station device perform service communication based on the sub-carrier of the second wavelength, or the capacity expansion device notifies the local point device to perform service communication with each access station device currently based on the sub-carrier of the second wavelength.

The capacity expansion device acquires the association relation between each access site device and the sub-carrier wave of the first wavelength. The association indicates a subcarrier of the first wavelength supported by each access site device or the association indicates a subcarrier of the first wavelength supported by each access site device and a subcarrier of the first wavelength currently allocated to each access site device. The sub-carrier of the first wavelength supported by each access site device refers to a sub-carrier that each access site device can coherently receive data, and can also be considered as a sub-carrier obtained by modulating data on signal light of the third wavelength. The subcarriers of the first wavelength currently allocated to each access site device belong to subcarriers of the first wavelength supported by each access site device.

When the association relationship indicates the subcarriers of the first wavelength supported by each access site device, the capacity expansion device uses the bandwidth required by each access site device, and allocates the subcarriers of the first wavelength to each access site device in the subcarriers of the first wavelength supported by each access site device. For any access station device, the sum of bandwidths of the sub-carriers of the first wavelength allocated to the access station device is not less than the bandwidth required by the access station device.

When the association relationship indicates the sub-carriers of the first wavelength supported by each access site device and the sub-carriers of the first wavelength currently allocated to each access site device, the capacity expansion device allocates the sub-carriers of the first wavelength to each access site device by using the bandwidth required by each access site device and the sub-carriers of the first wavelength currently allocated to each access site device in the sub-carriers of the first wavelength supported by each access site device. Here, when the first wavelength subcarrier is allocated to each access station device, the subcarrier currently allocated to each access station device is not adjusted as much as possible. For example, fig. 10 provides a schematic diagram of allocating subcarriers of a first wavelength to each access site device, the local site device receives the first wavelength subcarrier with a bandwidth of 400G and the second wavelength subcarrier with a bandwidth of 400G, the first wavelength and the second wavelength subcarriers are each 16 subcarriers (subcarrier 1 to subcarrier 16), the bandwidth of each subcarrier is 25G, there are a total of 8 access site devices (access site device 1 to access site device 8), two subcarriers of the first wavelength are currently allocated to each access site device, and two subcarriers of the second wavelength are allocated to each access site device, subcarrier 1 to subcarrier 16 are allocated in sequence to access site device 1 to access site device 8, each access site device uses only one subcarrier, the other subcarrier is idle, and idle subcarriers are indicated by dotted lines. Both access point device 2 and access point device 3 need to expand from 25G to 100G due to traffic regulation, which means that both access point device 2 and access point device 3 use 4 subcarriers. Fig. 10 also provides a schematic diagram of reassigning the subcarriers of the first wavelength for each access site device, assigning subcarrier 1 for access site device 1, assigning subcarrier 2 to subcarrier 5 for access site device 2, assigning subcarrier 6 to subcarrier 9 for access site device 3, assigning subcarrier 10 for access site device 4, assigning subcarrier 11 for access site device 5, assigning subcarrier 12 for access site device 6, assigning subcarrier 13 and subcarrier 14 (subcarrier 14 is idle) for access site device 7, and assigning subcarrier 15 and subcarrier 16 (subcarrier 16 is idle) for access site device 8. In this way, when the subcarrier is reassigned to each access station device, the currently assigned subcarrier is preferentially used, and the adjustment amplitude is smaller. For example, in fig. 10, the subcarriers corresponding to the access station apparatus 7 and the access station apparatus 8 are not adjusted.

And after the capacity expansion device re-distributes the subcarriers with the first wavelength for each access site device, sending subcarrier adjustment notification to the local point device. The local point device acquires the sub-carrier of the first wavelength allocated to each access site device from the sub-carrier adjustment notice, and records the sub-carrier of the first wavelength allocated to each access site device. The subcarrier adjustment notification carries a corresponding relationship between an identifier of each access site device and a subcarrier of a first wavelength and a second identifier, where the second identifier indicates subcarrier adjustment of communication by the first transceiver component, and further indicates the first sub-local point device to record subcarriers of the first wavelength allocated to each access site device.

The local point equipment adopts a multi-carrier modulation technology, and modulates the sub-carrier adjustment notification to the signal light with the second wavelength to obtain multi-sub-carriers with the second wavelength. Each access station device modulates a subcarrier adjustment notification on at least one subcarrier of the second wavelength currently in use. The local point device transmits the multi-subcarrier of the second wavelength to the access station device. The second transceiver unit of each access site device coherently receives its own corresponding sub-carrier of the second wavelength from the multi-sub-carriers of the second wavelength. The network element electric layer veneer of the access site equipment acquires the subcarrier adjustment notice from the second transceiver component. Each access station device acquires the sub-carrier of the first wavelength allocated to itself in the sub-carrier adjustment notice. Each access site device records its own corresponding sub-carrier of the first wavelength. Each access site device sends an adjustment completion message to the local site device via the second transceiver component. And after receiving the adjustment completion message from the second sub-local equipment, the network element electrical layer single board of the local point equipment sends the adjustment completion message to the capacity expansion device. In addition, the local point device may also adopt a multi-carrier modulation technique to modulate the sub-carrier adjustment notification onto the signal light with the first wavelength, so as to obtain multi-sub-carriers with the first wavelength. Each access station device modulates a subcarrier adjustment notification on at least one subcarrier of a first wavelength currently in use. The local point device transmits multiple subcarriers of a first wavelength to the access station device. The first transceiver unit of each access site device coherently receives its own corresponding sub-carrier of the first wavelength from the multiple sub-carriers of the first wavelength. Each access site device sends an adjustment completion message to the local site device via the first transceiver component. The reason why the first wavelength subcarrier and the second wavelength subcarrier are used for communication is that the backup of data transmission is performed, and it is needless to say that only the second wavelength subcarrier may be used for communication.

After receiving the adjustment completion message sent by the local point device, the capacity expansion device sends a first communication switching notification to the local point device, where the first communication switching notification indicates to use a subcarrier with a first wavelength to perform service communication, that is, indicates a network element electrical layer single board of the local point device to receive data received by a first sub local point device, and each network element electrical layer single board of the access site device receives data received by a first transceiver component. After receiving the first communication switching notification, the local point device sends the first communication switching notification to each access site device, then adjusts the network element electrical layer single board to receive data on the subcarriers of the first wavelength, and then sends the data to the access site device by using the reassigned subcarriers of the first wavelength. After each access site device receives the first communication switching notification, local oscillation light and signal light of the first transceiver component are adjusted to correspond to a target subcarrier, and for any access site device, the target subcarrier is a subcarrier with a first wavelength allocated to the access site device. The network element electrical layer veneer of each access site device selects to receive data from the first transceiver component. The manner in which the local point device sends the first communication switching notification to each access site device is the same as the process in which the local point device sends the subcarrier adjustment notification to each access site device, which is not described herein again.

The subsequent local point equipment modulates the data of each access site equipment to signal light with a first wavelength, obtains multi-subcarriers with the first wavelength, and sends the multi-subcarriers with the first wavelength to each access site equipment. Each access station device transmits data to the local station device using a subcarrier at the first wavelength. The network element electric layer single board of each access site device selects to receive the data on the sub-carrier of the first wavelength, and the network element electric layer single board of the local site device selects to receive the data on the sub-carrier of the first wavelength. In addition, the local point device modulates the data of each access site device onto the signal light with the second wavelength, obtains the multi-subcarrier with the second wavelength, and sends the multi-subcarrier with the second wavelength to each access site device. Each access station device also transmits data to the local station device using the sub-carrier of the second wavelength. In this way, since the same data is transmitted using the sub-carrier of the first wavelength and the sub-carrier of the second wavelength, the reliability of the traffic communication can be made higher.

The above-described mode of performing service communication by switching between sub-carriers using the first wavelength may be the following mode: the local point device uses the sub-carrier of the first wavelength before adjustment to send a sub-carrier adjustment notice to each access station device, and then switches to the sub-carrier of the first wavelength which is reassigned. Each access station device, after receiving the subcarrier adjustment, the first transceiver unit adjusts to use the reallocated subcarriers of the first wavelength, that is, returns an adjustment completion message to the local station device to use the reallocated subcarriers of the first wavelength. The local point device also uses the reallocated subcarriers of the first wavelength when sending the first communication switching notification to the access station device. In addition, the following modes can be adopted: after each access site device receives the subcarrier adjustment notice, the access site device is switched to a network element electric layer veneer to receive data from the first receiving and transmitting component, and the capacity expansion device is not required to issue a first communication switching notice.

Step 804, allocating a subcarrier of the second wavelength to each access station device based on the bandwidth required by each access station device and the association relationship between each access station device and the subcarrier of the second wavelength.

In this embodiment, there are various ways to perform step 804, and two ways are provided below.

In one mode, each access site device is allocated a subcarrier of a second wavelength based on the bandwidth required by each access site device and the subcarrier of the second wavelength supported by each access site device.

In this embodiment, the capacity expansion device uses the bandwidth required by each access site device, and allocates, among the subcarriers of the second wavelength supported by each access site device, subcarriers of the second wavelength to each access site device. For any access station device, the sum of bandwidths of the sub-carriers of the second wavelength allocated to the access station device is not less than the bandwidth required by the access station device.

In a second mode, a subcarrier of the second wavelength is allocated to each access site device based on the bandwidth required by each access site device, the subcarrier of the second wavelength supported by each access site device, and the subcarrier of the second wavelength currently allocated to each access site device.

In this embodiment, the capacity expansion device uses the bandwidth required by each access site device and the subcarrier of the second wavelength currently allocated to each access site device, and allocates the subcarrier of the second wavelength to each access site device among the subcarriers of the second wavelength supported by each access site device. Here, when the sub-carrier of the second wavelength is allocated to each access station device, the sub-carrier currently allocated to each access station device is not adjusted as much as possible. For example, fig. 11 provides a schematic diagram of reassigning the subcarriers of the second wavelength for each access site device, assigning subcarrier 1 for access site device 1, assigning subcarrier 2 to subcarrier 5 for access site device 2, assigning subcarrier 6 to subcarrier 9 for access site device 3, assigning subcarrier 10 for access site device 4, assigning subcarrier 11 for access site device 5, assigning subcarrier 12 for access site device 6, assigning subcarrier 13 and subcarrier 14 for access site device 7, and assigning subcarrier 15 and subcarrier 16 for access site device 8, with subcarriers 14 and 16 continuing idle, based on fig. 10. In this way, when the subcarrier is reassigned to each access station device, the currently assigned subcarrier is preferentially used, and the adjustment amplitude is smaller.

Step 805, notifying the local point device and each access station device of the sub-carriers of the second wavelength allocated for each access station device.

The process in step 805 refers to the process in step 704.

Step 806, sending a capacity expansion completion message to the local point device and each access station device, where the capacity expansion completion message indicates that the sub-carrier of the first wavelength and the sub-carrier of the second wavelength can be used for service communication.

In this embodiment, in step 805, the capacity expansion device receives the adjustment completion message sent by the local point device, and the capacity expansion device sends the capacity expansion completion message to the local point device, where the local point device modulates the capacity expansion completion message to the signal light of the first wavelength and the signal light of the second wavelength to obtain multiple subcarriers of the first wavelength and multiple subcarriers of the second wavelength, and the local point device sends the multiple subcarriers of the first wavelength and the multiple subcarriers of the second wavelength to each access station device, where the reallocated subcarriers are used. After the local point device and the network element electric layer single board of each access site device receive the capacity expansion completion message, the local point device uses the subcarriers of the first wavelength and the subcarriers of the second wavelength to send data to the access site device, and the data on the subcarriers of the first wavelength and the subcarriers of the second wavelength are the same. Each access site device may choose to receive data on a subcarrier of a first wavelength, or may choose to receive data on a subcarrier of a second wavelength, that is, a network element electrical layer board of each access site device chooses to receive data from a first transceiver component or receive data from a second transceiver component. Each access station device transmits data to the local station device using a subcarrier at a first wavelength and transmits data to the local station device using a subcarrier at a second wavelength. The network element electric layer single board of the local point equipment selects to receive the data received by the first sub local point equipment or the second sub local point equipment. Thus, since two communication paths can be used for communication, the reliability of service communication is made relatively high.

If the sum of the bandwidths required by the plurality of access station apparatuses is higher than the bandwidth of the subcarrier of the second wavelength received by the local station apparatus, then control increases the bandwidth of the subcarrier of the second wavelength received by the local station apparatus in step 807.

In this embodiment, if the sum of bandwidths required by the multiple access site devices is higher than the bandwidth of the subcarrier of the second wavelength received by the local point device, it is indicated that the local point device cannot carry the service communication after the capacity expansion of the multiple access site devices, because: the data of each access site device are converged to the local device and limited by the receiving bandwidth of the local device, when the sum of the bandwidths required by the plurality of access site devices is higher than the bandwidth of the sub-carrier wave of the second wavelength received by the local device, the current total network capacity is indicated to exceed the receiving capacity of the local device, the data receiving can not be normally completed, and the data receiving can only be completed by adding a module. The capacity expansion device controls to increase the bandwidth of the sub-carrier wave of the second wavelength received by the local point equipment, namely, controls to increase the bandwidth of the sub-carrier wave of the second wavelength received by the second sub-local point equipment. For example, the capacity expansion device sends a capacity expansion indication message to a terminal used by the manager, where the capacity expansion indication message indicates to increase the bandwidth of the sub-carrier of the second wavelength received by the local device, and the terminal of the manager receives the capacity expansion indication message. The manager may increase the bandwidth of the sub-carrier of the second wavelength received by the local device. If the manager replaces the transceiver module for receiving and transmitting the sub-carriers with the second wavelength by the local point equipment, the transceiver module can support the bandwidth after the capacity expansion of the plurality of access site equipment. For another example, the local device is configured with a plurality of transceiver modules for receiving the subcarriers of the second wavelength, and the capacity expansion device sends a capacity expansion indication message to the local device, where the capacity expansion indication message instructs the local device to increase the bandwidth for receiving the subcarriers of the second wavelength, and the local device may switch the transceiver modules for receiving the subcarriers of the second wavelength to transceiver modules with a larger bandwidth.

Since the bandwidth of the local point device for receiving the subcarrier with the first wavelength is the same as the bandwidth of the local point device for receiving the subcarrier with the second wavelength, when the sum of bandwidths required by the plurality of access site devices is higher than the bandwidth of the local point device for receiving the subcarrier with the second wavelength, the capacity expansion device also controls to increase the bandwidth of the local point device for receiving the subcarrier with the first wavelength, namely, controls to increase the bandwidth of the first sub-local point device for receiving the subcarrier with the first wavelength. The expansion in step 807 may be referred to as hardware expansion.

After the capacity of the local point equipment is expanded by hardware, the local point equipment sends the newly added sub-carrier to the access site equipment needing capacity expansion, so that the capacity expansion of the access site equipment is realized.

Based on the flow shown in fig. 8, the capacity expansion device can reassign the subcarriers of the first wavelength and the subcarriers of the second wavelength to the plurality of access station apparatuses only by triggering the handover twice.

The flow of the method of expansion shown in fig. 9 is as follows.

Step 901, detecting a capacity expansion requirement of at least one access site device of a plurality of access site devices, and determining a bandwidth required by each access site device.

The processing in step 901 is referred to as processing in step 701, and will not be described here.

Step 902, determining whether the sum of bandwidths required by the plurality of access station apparatuses is higher than the bandwidth of the subcarrier of the second wavelength received by the local point apparatus.

The processing in step 902 is referred to as processing in step 802, and will not be described in detail herein.

In step 903, if the sum of bandwidths required by the multiple access site devices is not higher than the bandwidth of the subcarrier of the second wavelength received by the local site device, the local site device is controlled to perform service communication with each access site device based on the subcarrier of the first wavelength currently allocated to each access site device.

In this embodiment, the capacity expansion device issues a first communication switching notification to the local point device, where the first communication switching notification local point device and the network element electrical layer board of each access site device receive data on a subcarrier of a first wavelength. After receiving the first communication switching notification, the local point device modulates the first communication switching notification to signal light of a first wavelength and signal light of a second wavelength, and obtains multiple subcarriers of the first wavelength and multiple subcarriers of the second wavelength. The local point device transmits a multi-subcarrier at a first wavelength and a multi-subcarrier at a second wavelength. Here, the network element electrical layer board of each access site device selects to receive the data of the first transceiver component or the data of the second transceiver component, so each access site device only receives the first communication switching notification on the subcarrier passing through the first wavelength or the subcarrier of the second wavelength. For each access site device, if the current network element electric layer single board of the access site device receives the data of the first receiving and transmitting component, adjustment is not needed, and if the current network element electric layer single board of the access site device receives the data of the second receiving and transmitting component, the network element electric layer single board is adjusted to receive the data of the first receiving and transmitting component. Next, the local point device modulates data of each access site device onto signal light of a first wavelength, obtains multiple subcarriers of the first wavelength, and sends the multiple subcarriers of the first wavelength to each access site device. Each access station device transmits data to the local station device using a subcarrier at the first wavelength. The network element electric layer single board of each access site device selects to receive the data on the sub-carrier wave of the first wavelength, and the network element electric layer single board of the local point device selects to receive the data received by the first sub-local point device.

In addition, the local point device modulates the data of each access site device onto the signal light with the second wavelength, obtains the multi-subcarrier with the second wavelength, and sends the multi-subcarrier with the second wavelength to each access site device. And each access station device also transmits data to the local station device using the sub-carrier of the second wavelength. In this way, even if data is not received on the sub-carrier of the first wavelength, data can be received from the sub-carrier of the second wavelength, so that the reliability of traffic communication is higher.

Step 904, allocating a subcarrier of the second wavelength to each access site device based on the bandwidth required by each access site device and the association relationship between each access site device and the subcarrier of the second wavelength.

The processing in step 904 is referred to as processing in step 804, and will not be described in detail herein.

Step 905, notifying the local point device and each access station device of the subcarriers of the second wavelength allocated for each access station device.

The process in step 905 is the same as that in step 704, and will not be described here.

At step 906, the control office point device communicates traffic with each access site device based on the sub-carriers of the second wavelength allocated to each access site device.

In this embodiment, in step 905, the capacity expansion device receives the adjustment completion message sent by the local point device, and the capacity expansion device sends a second communication switching notification to the local point device, where the second communication switching notification indicates that the local point device and the network element electrical layer board of each access station device receive data on a subcarrier of the second wavelength. After the local point device receives the second communication switching notification, the local point device sends the second communication switching notification to each access site device (similar to the first communication switching notification sent in the foregoing, which is not described herein again), and then adjusts the network element electrical layer board to receive the data received by the second sub-local point device from the access site device. After each access site device receives the second communication switching notification, the network element electric layer single board is adjusted to receive the data of the second receiving and transmitting component. The subsequent local point equipment modulates the data of each access site equipment to signal light with a second wavelength, obtains multi-subcarriers with the second wavelength, and sends the multi-subcarriers with the second wavelength to each access site equipment. Each access station device also transmits data to the local station device using the sub-carrier of the second wavelength. The network element electric layer single board of each access site device selects to receive the data on the subcarrier of the second wavelength, and the network element electric layer single board of the local site device selects to receive the data on the subcarrier of the second wavelength.

In addition, the local point device modulates the data of each access site device onto the signal light with the first wavelength, obtains the multi-subcarrier with the first wavelength, and sends the multi-subcarrier with the first wavelength to each access site device. Each access station device transmits data to the local station device using a subcarrier at the first wavelength. In this way, even if data is not received on the sub-carrier of the second wavelength, data can be received from the sub-carrier of the first wavelength, so that the reliability of traffic communication is relatively high.

The above description of step 906 is merely an example, and embodiments of the present application are not limited.

Step 907, reassigning the first wavelength sub-carrier to each access site device based on the bandwidth required by each access site device and the association of each access site device with the first wavelength sub-carrier.

The process of step 907 is referred to as the process of allocating subcarriers of the first wavelength to each access station apparatus in step 803.

Step 908 informs the local point device and each access station device of the sub-carriers of the first wavelength allocated for each access station device.

The process in step 908 is similar to the process in step 704 and will not be described again here.

In step 909, a capacity expansion completion message is sent to the local point device and each access station device, where the capacity expansion completion message indicates that both the sub-carrier of the first wavelength and the sub-carrier of the second wavelength can be used for service communication.

The process in step 909 is referred to as the process in step 806.

In step 910, if the sum of bandwidths required by the plurality of access station apparatuses is higher than the bandwidth of the sub-carrier of the second wavelength received by the local station apparatus, the local station apparatus is controlled to increase the bandwidth of the sub-carrier of the second wavelength received by the local station apparatus.

The process of step 910 is referred to as the process of step 807, and will not be described in detail herein.

Based on the flow shown in fig. 9, the capacity expansion device can be quickly switched to use the sub-carrier of the first wavelength to perform service communication.

After the processes of fig. 7, fig. 8 and fig. 9 are finished, the capacity expansion device sends a capacity expansion completion message to the terminal used by the manager, and the manager performs service upgrade in the access site equipment after capacity expansion to complete service upgrade of the access site equipment. Or the capacity expansion device sends a service upgrading instruction to the access site equipment with capacity expansion completion through the local point equipment, and the access site equipment with capacity expansion completion carries out service upgrading after receiving the service upgrading instruction.

According to the embodiment of the application, when the capacity expansion is carried out on the access site equipment, the lossless capacity expansion can be realized without increasing the complexity of the system, and the device bandwidth of the access site equipment can be utilized to the maximum (for example, the capacity expansion of the access site equipment is required to be 100G, the device bandwidth of the access site equipment is required to support 100G, and the whole bandwidth of the local site equipment is not required to be supported), so that the cost of the access site equipment is saved.

The capacity expansion device provided by the embodiment of the application is described below. Fig. 12 is a block diagram of a capacity expansion device according to an embodiment of the present application. The apparatus may be implemented as part or all of an apparatus by software, hardware, or a combination of both. The apparatus provided in this embodiment of the present application may implement the flows described in fig. 7, fig. 8, and fig. 9 in this embodiment, where the apparatus is applied to a coherent optical system, and the system includes a local point device and a plurality of access station devices, where the local point device and the plurality of access station devices are connected through an optical fiber ring, and the apparatus includes: a detection module 1210, a control module 1220, and an allocation module 1230, wherein:

a detection module 1210, configured to detect a capacity expansion requirement of at least one access site device of the plurality of access site devices, determine a bandwidth required by each access site device, and specifically may be configured to implement the detection function of step 701 and perform an implicit step included in step 701;

a control module 1220, configured to control the local point device to perform service communication with each access site device based on the subcarriers of the first wavelength, and specifically may be used to implement the control function of step 702 and execute the implicit steps included in step 702;

An allocation module 1230, configured to allocate, for each access site device, a subcarrier of a second wavelength based on a bandwidth required by each access site device and an association relationship between each access site device and the subcarrier of the second wavelength, which may specifically be used to implement the determining function of step 703 and execute the implicit step included in step 703;

the control module 1220 is further configured to notify the local point device and each access station device of the sub-carrier of the second wavelength allocated to each access station device, and may specifically be used to implement the control function of step 704 and execute the implicit steps included in step 704.

In a possible implementation manner, the detection module 1210 is further configured to determine, before the controlling the local point device to perform service communication with each access site device based on the subcarrier of the first wavelength, that the local point device and each access site device currently perform service communication based on the subcarrier of the second wavelength;

the control module 1220 is configured to:

allocating the subcarriers of the first wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the subcarriers of the first wavelength;

And controlling the local point equipment to carry out service communication with each access site equipment based on the sub-carriers with the first wavelength allocated to each access site equipment.

In a possible implementation manner, the control module 1220 is configured to control the office point device to perform service communication with each access site device based on the sub-carrier of the first wavelength currently allocated to each access site device;

the control module 1220 is further configured to control the local point device and each access site device to perform service communication based on the subcarrier of the second wavelength allocated to each access site device after notifying the local point device and each access site device of the subcarrier of the second wavelength allocated to each access site device;

the allocating module 1230 is further configured to re-allocate, to each access site device, a subcarrier of the first wavelength based on a bandwidth required by each access site device and an association relationship between each access site device and the subcarrier of the first wavelength;

the control module 1220 is further configured to notify the local point device and each access station device of the subcarriers of the first wavelength allocated to each access station device.

In a possible implementation manner, the control module 1220 is further configured to send a capacity expansion completion message to the local point device and each access station device, where the capacity expansion completion message indicates that both the sub-carrier of the first wavelength and the sub-carrier of the second wavelength can be used for service communications.

In one possible implementation, the allocation module 1230 is configured to:

allocating a subcarrier of the second wavelength to each access site device based on the bandwidth required by each access site device and the subcarrier of the second wavelength supported by each access site device; or alternatively, the process may be performed,

and allocating the subcarriers of the second wavelength for each access site device based on the bandwidth required by each access site device, the subcarriers of the second wavelength supported by each access site device and the subcarriers of the second wavelength currently allocated for each access site device.

In one possible implementation, the detection module 1210 is further configured to:

before controlling the local point device to perform service communication with each access site device based on the sub-carrier of the first wavelength, determining that the sum of bandwidths required by the plurality of access site devices is not higher than the bandwidth of the sub-carrier of the second wavelength received by the local point device.

In a possible implementation manner, the detection module 1210 is further configured to determine that a sum of bandwidths required by the plurality of access station apparatuses is higher than a bandwidth of a subcarrier of the second wavelength received by the local point apparatus;

the control module 1220 is further configured to control to increase a bandwidth of the local point device for receiving the subcarrier of the second wavelength.

In one possible implementation, the detection module 1210 is configured to:

determining that a capacity expansion requirement of the at least one access site device is detected when a capacity expansion request sent by the at least one access site device is received, wherein the capacity expansion request indicates an increase amount of bandwidth required by the at least one access site device or a required bandwidth; or, determining that a capacity expansion requirement of the at least one access site device is detected when a traffic upgrade notification is received, the traffic upgrade notification indicating an amount of bandwidth increase or a required bandwidth of the at least one access site device.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and modules described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.

In some embodiments, a computer program product is provided that includes computer instructions stored in a computer-readable storage medium. The processor of the capacity-expanding device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the capacity-expanding device performs the flow shown in fig. 7, 8 and 9.

Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described generally in terms of functionality in the foregoing description to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Those of ordinary skill in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system architecture, apparatus, and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or modules, or may be an electrical, mechanical, or other form of connection.

The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purposes of the embodiments of the present application.

In addition, each module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software.

The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method in the various embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The terms "first," "second," and the like in this application are used for distinguishing between similar elements or items having substantially the same function and function, and it should be understood that there is no logical or chronological dependency between the terms "first," "second," and no limitation on the amount or order of execution. It will be further understood that, although the following description uses the terms first, second, etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, a first wavelength may be referred to as a second wavelength, and similarly, a second wavelength may be referred to as a first wavelength, without departing from the scope of the various examples. The first wavelength and the second wavelength may both be wavelengths, and in some cases may be separate and distinct wavelengths.

The term "at least one" means one or more, and the term "plurality" means two or more.

The foregoing description is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions are all covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of expanding capacity, the method being applied to a coherent optical system including a local point device and a plurality of access point devices, the local point device and the plurality of access point devices being connected by a fiber optic ring, the method comprising:

detecting the capacity expansion requirement of at least one access site device in the plurality of access site devices, and determining the bandwidth required by each access site device;

controlling the local point equipment and each access site equipment to carry out service communication based on the subcarriers of the first wavelength;

allocating the sub-carrier of the second wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the sub-carrier of the second wavelength;

and notifying the local point equipment and each access site equipment of the sub-carriers of the second wavelength allocated for each access site equipment.

2. The method of claim 1, further comprising, prior to said controlling said office point device to communicate traffic with each access site device based on said first wavelength subcarrier: determining that the local point equipment and each access site equipment currently perform service communication based on the subcarriers of the second wavelength;

The controlling the local point device to perform service communication with each access site device based on the subcarrier of the first wavelength includes:

3. The method of claim 1, wherein said controlling the office point device to communicate with each access site device on a first wavelength subcarrier basis comprises:

controlling the local point equipment and each access site equipment to carry out service communication based on the subcarrier of the first wavelength currently allocated to each access site equipment;

after notifying the local point device and each access station device of the subcarriers of the second wavelength allocated to each access station device, the method further includes:

controlling the local point equipment and each access site equipment to perform service communication based on the sub-carriers of the second wavelength distributed to each access site equipment;

Re-distributing the sub-carriers of the first wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the sub-carriers of the first wavelength;

and notifying the local point device and each access site device of the sub-carriers of the first wavelength allocated to each access site device.

4. A method according to claim 2 or 3, characterized in that the method further comprises:

and sending a capacity expansion completion message to the local point device and each access station device, wherein the capacity expansion completion message indicates that the subcarriers with the first wavelength and the subcarriers with the second wavelength can be used for service communication.

5. The method according to any one of claims 1 to 4, wherein the allocating the sub-carrier of the second wavelength to each access site device based on the required bandwidth of each access site device and the association of each access site device with the sub-carrier of the second wavelength comprises:

6. The method according to any one of claims 1 to 5, wherein before controlling the local point device to perform traffic communication with each access site device based on the sub-carrier of the first wavelength, further comprises:

determining that the sum of bandwidths required by the plurality of access site devices is not higher than the bandwidth of the subcarrier of the second wavelength received by the local point device.

7. The method of claim 6, wherein the method further comprises:

determining that the sum of bandwidths required by the plurality of access site devices is higher than the bandwidth of the subcarrier of the second wavelength received by the local point device;

and controlling to increase the bandwidth of the subcarrier of the local point equipment for receiving the second wavelength.

8. The method according to any of claims 1 to 7, wherein said detecting a capacity expansion requirement of at least one of said plurality of access site devices comprises:

Determining that a capacity expansion requirement of the at least one access site device is detected when a capacity expansion request sent by the at least one access site device is received, wherein the capacity expansion request indicates an increase amount of bandwidth required by the at least one access site device or a required bandwidth; or alternatively, the process may be performed,

when a traffic upgrade notification is received, determining that a capacity expansion requirement of the at least one access site device is detected, the traffic upgrade notification indicating an amount of bandwidth increase or a required bandwidth of the at least one access site device.

9. An apparatus for expanding capacity, the apparatus being applied to a coherent optical system, the system comprising a local point device and a plurality of access point devices, the local point device and the plurality of access point devices being connected by a fiber optic ring, the apparatus comprising:

the detection module is used for detecting the capacity expansion requirement of at least one access site device in the plurality of access site devices and determining the bandwidth required by each access site device;

the control module is used for controlling the local point equipment and each access site equipment to carry out service communication based on the subcarriers of the first wavelength;

the allocation module is used for allocating the subcarriers of the second wavelength to each access site device based on the bandwidth required by each access site device and the association relation between each access site device and the subcarriers of the second wavelength;

The control module is further configured to notify the local point device and each access station device of the subcarrier of the second wavelength allocated to each access station device.

10. The apparatus of claim 9, wherein the detection module is further configured to determine that the local point device is currently in traffic communication with each access site device based on the subcarrier of the second wavelength before the controlling the local point device to be in traffic communication with each access site device based on the subcarrier of the first wavelength;

the control module is used for:

11. The apparatus of claim 9, wherein the control module is configured to control the local point device to perform traffic communication with each access site device based on the subcarriers of the first wavelength currently allocated to each access site device;

The control module is further configured to control the local point device and each access site device to perform service communication based on the subcarrier of the second wavelength allocated to each access site device after notifying the local point device and each access site device of the subcarrier of the second wavelength allocated to each access site device;

the allocation module is further configured to reallocate the first wavelength subcarrier to each access station device based on a bandwidth required by each access station device and an association relationship between each access station device and the first wavelength subcarrier;

the control module is further configured to notify the local point device and each access station device of the subcarrier with the first wavelength allocated to each access station device.

12. The apparatus according to claim 10 or 11, wherein the control module is further configured to send a capacity expansion completion message to the local point device and each access station device, the capacity expansion completion message indicating that both the sub-carrier of the first wavelength and the sub-carrier of the second wavelength are available for traffic communication.

13. The apparatus according to any one of claims 9 to 12, wherein the allocation module is configured to:

14. The apparatus of any one of claims 9 to 13, wherein the detection module is further configured to:

15. The apparatus according to any one of claims 9 to 14, wherein the detection module is configured to:

16. A capacity-expanding apparatus, comprising a processor and a memory, wherein:

the memory stores computer instructions;

the processor executing the computer instructions to cause the apparatus to perform the method of any one of claims 1 to 8.

17. A computer readable storage medium having stored therein at least one computer instruction that is readable by a processor to cause a capacity expanding device to perform the method of any of claims 1 to 8.