CN108512601B - Method and device for multi-homing access network - Google Patents
Method and device for multi-homing access network Download PDFInfo
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- CN108512601B CN108512601B CN201710120698.4A CN201710120698A CN108512601B CN 108512601 B CN108512601 B CN 108512601B CN 201710120698 A CN201710120698 A CN 201710120698A CN 108512601 B CN108512601 B CN 108512601B
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The embodiment of the application provides a method and a device for multi-homing access network, relates to the field of communication, and can solve the problem that the composite wave of the access network cannot be subjected to dispersion compensation. The method comprises the following steps: the first site determines the wavelength of service information to be sent of the first site, wherein the wavelength of the service information to be sent of the first site comprises a subcarrier corresponding to each host site, and the subcarrier corresponding to each host site is pre-compensated according to a dispersion value corresponding to each host site; and the first site sends the service information carried by the subcarrier pre-compensated by each host site to the next hop site. The embodiment of the application is applied to the scene of asymmetric upper and lower service bandwidths.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for multi-homing access to a network.
Background
The current optical network networking adopts a typical ring network structure. In ring networks, point-to-point termination and point-to-point traffic up-down techniques are the most common. As shown in fig. 1, the architecture diagram is a hardware module and an architecture diagram of a ring Network structure using point-to-point termination and point-to-point service technology, where the architecture diagram includes Broadband Gateway control devices (BNG) and Optical Line Terminals (OLT), and 60% of bandwidth penetrates through an electrical layer. An optical module used in the first prior art is low in cost, and bandwidth in a ring is not wasted, so that the first prior art is a networking mode based on the bandwidth in the ring.
However, the point-by-point termination and point-by-point up-and-down service technology can cause most of bandwidth to pass through in the electrical layer, while the optical layer needs precise dispersion compensation, but point-by-point electrical relay wastes optical layer modules and introduces delay. In addition, the residual dispersion of the new wavelength and the through wavelength in the service transmission is not easy to control, and the composite wave dispersion compensation can not be carried out.
Disclosure of Invention
The embodiment of the application provides a method and a device for multi-home access network, which can solve the problem that the composite wave of the access network cannot be subjected to dispersion compensation.
In one aspect, an embodiment of the present application provides a method for a multi-homing access network, including: the first site determines the wavelength of service information to be sent of the first site, wherein the wavelength of the service information to be sent of the first site comprises a subcarrier corresponding to each host site, and the subcarrier corresponding to each host site is pre-compensated according to a dispersion value corresponding to each host site; and the first site sends the service information carried by the subcarrier pre-compensated by each host site to the next hop site. Therefore, the first station can respectively pre-compensate the sub-carriers corresponding to each host station according to the dispersion value corresponding to each host station, and compared with the prior art, the dispersion compensation cannot be performed on the composite wave of each station.
In a possible design, before the first station determines a wavelength of the service information to be sent by the first station, the method further includes: the first station allocates subcarriers to each sink station according to the bandwidth required by each sink station, and pre-estimates the corresponding dispersion value of each sink station when the subcarriers allocated by each sink station are transmitted to each sink station. Thus, the first station can allocate sub-carriers to each sink station according to the bandwidth required by each sink station, and compared to the solution of point-to-point transmission shown in fig. 2, the optical network shown in fig. 2 includes several BNGs and OLTs, and the wavelength of any BNG can directly reach any OLT from point to point, or vice versa. In the technical scheme of point-to-point transmission, the number of logical connections of a network is in direct proportion to the number of single boards of each site, so that the correlation between the point-to-point transmission technology and the bandwidth is weak, and the bandwidth is wasted.
In a possible design, the first station determines a wavelength of service information to be transmitted by the first station, where the wavelength of the service information to be transmitted by the first station includes a subcarrier corresponding to each host station, and the pre-compensating the subcarrier corresponding to each host station according to a dispersion value corresponding to each host station includes: the first site determines the wavelength of the service information to be sent of the first site according to the wavelength non-conflict distribution principle in the wavelength division multiplexing network; the first station determines the bandwidth required for transmitting the subcarrier corresponding to each host station according to the dispersion value corresponding to each host station; the first station adjusts the sub-carrier waves distributed by each host station according to the bandwidth required by the sub-carrier waves corresponding to each host station to be sent to each host station; and the first station respectively carries out dispersion pre-compensation on the adjusted subcarriers corresponding to each host station according to the dispersion value corresponding to each host station. Thus, when the first station performs dispersion pre-compensation on the subcarriers corresponding to each host station, the first station may first determine the bandwidth required by each host station according to the dispersion value corresponding to each host station, and then adjust the subcarriers allocated to each host station according to the bandwidth required by each host station; and then, respectively carrying out dispersion pre-compensation on the sub-carriers corresponding to each adjusted host site according to the dispersion value corresponding to each host site.
In one possible design, the method further includes: a first station receives the wavelength of corresponding service information of each source station sent by a last hop station; and the first station demodulates the sub-carriers corresponding to the first station from the wavelength of the service information corresponding to each source station. In this way, the first station can receive the wavelength of the service information corresponding to each source station, but only demodulate the subcarrier corresponding to the first station in the wavelength of the service information corresponding to each source station.
On the other hand, an embodiment of the present application provides a method for a multi-homing access network, including: the first site determines the wavelength of service information to be sent of the first site, and allocates the service information carried by the wavelength of the service information to be sent to the time slot of each host site according to the dispersion value corresponding to each host site; and the first site sends the service information carried by the wavelength of the service information to be sent to the next hop site according to the adjusted time slot of each host site. Therefore, after the first site determines the wavelength of the service information to be transmitted by the first site, the service information carried by the wavelength of the service information to be transmitted can be allocated to the time slot of each host site according to the dispersion value corresponding to each host site.
In one possible design, before the first station determines the wavelength of the service information to be transmitted by the first station, the method further includes: the first station allocates time slots for each host station according to the bandwidth required by each host station, and pre-estimates the corresponding dispersion value of each host station when the wavelength of the service information to be sent is sent to each host station. Therefore, the first station can allocate time slots according to the bandwidth required by each station, and the problem that the technical scheme of point-to-point transmission wastes bandwidth can be solved.
In a possible design, the determining, by the first station, a wavelength of service information to be sent by the first station, and adjusting, according to a dispersion value corresponding to each host station, a time slot allocated to each host station by the service information carried by the wavelength of the service information to be sent includes: the first site determines the wavelength of the service information to be sent of the first site according to the wavelength non-conflict distribution principle in the wavelength division multiplexing network; the first site determines the bandwidth required for transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot according to the corresponding dispersion value of each host site; the first site adjusts the time slot allocated by each host site according to the bandwidth required by the transmission of the wavelength of the service information to be transmitted to each host site according to the allocated time slot; and the first station carries out dispersion pre-compensation on the time slot distributed by each adjusted host station according to the corresponding dispersion value of each host station, and the time slot of each host station after dispersion pre-compensation is carried to the time slot which distributes the service information carried by the wavelength of the service information to be sent to each host station. Thus, when the first station adjusts the time slot of each host station according to the dispersion value corresponding to each host station, the first station may determine the bandwidth required by each host station according to the dispersion value corresponding to each host station, then adjust the time slot allocated to each host station according to the bandwidth required by each host station, and then carry the time slot of each host station after dispersion pre-compensation to the time slot allocated to each host station for the service information carried by the wavelength of the service information to be transmitted.
In one possible design, the method further includes: a first station receives the wavelength of corresponding service information of each source station sent by a last hop station; and the first site demodulates the wavelength of the service information corresponding to the first site from the wavelength of the service information corresponding to each source site according to the time slot allocated by the first site. In this way, the first station can receive the wavelength of the service information corresponding to each source station, but only demodulate the service information carried by the wavelength of the service information corresponding to each source station in the time slot allocated by the first station.
In another aspect, an embodiment of the present application provides a first station, including: the determining unit is configured to determine a wavelength of the service information to be sent by the first site, where the wavelength of the service information to be sent by the first site includes a subcarrier corresponding to each host site, and precompensates the subcarrier corresponding to each host site according to a dispersion value corresponding to each host site; and the sending unit is used for sending the service information carried by the subcarrier pre-compensated by each host station to the next hop station.
In one possible design, the first site further includes: and the distribution unit is used for distributing the subcarriers for each host site according to the bandwidth required by each host site and pre-estimating the dispersion value corresponding to each host site when the subcarriers distributed by each host site are sent to each host site.
In one possible embodiment, the determination unit is configured to: determining the wavelength of service information to be sent of a first site according to a wavelength non-conflict distribution principle in a wavelength division multiplexing network; determining the bandwidth required for transmitting the subcarrier corresponding to each host site according to the dispersion value corresponding to each host site; adjusting the sub-carriers distributed by each host site according to the bandwidth required by the sub-carriers corresponding to each host site to be sent to each host site; and respectively carrying out dispersion pre-compensation on the adjusted sub-carriers corresponding to each host site according to the dispersion value corresponding to each host site.
In one possible design, the first site further includes: a receiving unit, configured to receive a wavelength of service information corresponding to each source station sent by a previous hop station; and the demodulation unit is used for demodulating the subcarrier corresponding to the first site from the wavelength of the service information corresponding to each source site.
In another aspect, an embodiment of the present application provides a first station, including: the determining unit is used for determining the wavelength of the service information to be sent of the first site, and adjusting the time slot for distributing the service information carried by the wavelength of the service information to be sent to each host site according to the corresponding dispersion value of each host site; and the sending unit is used for sending the service information carried by the wavelength of the service information to be sent to the next hop site according to the adjusted time slot of each host site.
In one possible design, the first site further includes: and the distribution unit is used for distributing time slots for each host site according to the bandwidth required by each host site and pre-estimating the corresponding dispersion value of each host site when the wavelength of the service information to be sent is sent to each host site.
In one possible embodiment, the determination unit is configured to: determining the wavelength of service information to be sent of a first site according to a wavelength non-conflict distribution principle in a wavelength division multiplexing network; determining the bandwidth required for transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot according to the corresponding dispersion value of each host site; adjusting the time slot allocated to each host site according to the bandwidth required by transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot; and respectively carrying out dispersion pre-compensation on the time slot distributed by each adjusted host site according to the dispersion value corresponding to each host site, and carrying the time slot of each host site subjected to dispersion pre-compensation to the time slot for distributing the service information carried by the wavelength of the service information to be sent to each host site.
In one possible design, the first site further includes: a receiving unit, configured to receive a wavelength of service information corresponding to each source station sent by a previous hop station; and the demodulation unit is used for demodulating the wavelength of the service information corresponding to the first site from the wavelength of the service information corresponding to each source site according to the time slot allocated by the first site.
In yet another aspect, the present application provides a computer storage medium for storing computer software instructions for the first station, which includes a program designed to perform the above aspects.
Thus, the first station may determine the wavelength of the service information to be transmitted of the first station, where the wavelength of the service information to be transmitted includes the subcarrier that is subjected to dispersion compensation by each host station, then the first station precompensates the subcarrier that corresponds to each host station according to the dispersion value that corresponds to each host station, and then the first station transmits the service information carried by the compensated subcarrier to each host station. Compared with the prior art that the composite wave dispersion compensation can not be carried out, the embodiment of the application can carry out the dispersion compensation respectively through the sub-carriers of the wavelength of the service information to be sent, thereby solving the problem that the composite wave of the access network can not carry out the dispersion compensation. Or after the first site determines the wavelength of the service information to be transmitted by the first site, the first site allocates the service information carried by the wavelength of the service information to be transmitted to the time slot of each host site according to the dispersion value corresponding to each host site.
Drawings
Fig. 1 is a schematic diagram of a network architecture of a point-by-point termination and point-by-point uplink and downlink service technology according to an embodiment of the present application;
fig. 2 is a schematic diagram of a network architecture of a point-to-point transmission technique according to an embodiment of the present application;
fig. 3 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 4 is a schematic internal structural diagram of a first station according to an embodiment of the present disclosure;
fig. 5 is a schematic signal interaction diagram of a multi-home access network according to an embodiment of the present application;
fig. 6 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of λ 1 according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of an OLT according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of λ 9 according to an embodiment of the present application;
fig. 10 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 11 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of an OLT1 according to an embodiment of the present disclosure;
fig. 13 is a schematic diagram of a network architecture of a passive optical network technology according to an embodiment of the present application;
fig. 14 is a schematic signal interaction diagram of a multi-home access network according to an embodiment of the present application;
fig. 15 is a schematic diagram of a timeslot corresponding to a first station according to an embodiment of the present application;
fig. 16 is a schematic diagram of a timeslot corresponding to each BNG according to an embodiment of the present application;
fig. 17 is a schematic structural diagram of a first station according to an embodiment of the present application;
fig. 18 is a schematic structural diagram of a first station according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a networking scheme of a plurality of remote sites driven by a multi-core layer switch, for example, a networking scheme of a plurality of sites within 100km directly driven by a multi-core layer switch, which can be applied to a scene of data transmission in an optical network, each core switch can realize flow balance, bandwidth of each site can be configured as required, and the networking scheme is applicable to a scene of asymmetric upper and lower service bandwidth.
The network architecture of the embodiment of the present application may include a plurality of sites, and the plurality of sites are at least two types of sites, which may be, for example, an OLT and a BNG. The present invention is described by taking a first station as an example, the first station is included in the plurality of stations, and the first station may be an OLT or a BNG. For example, as shown in fig. 3, it is assumed that the optical network includes 4 BNGs and 8 OLTs, and if the first site is the OLT, when the OLT receives the service information carried by the wavelength of the service information corresponding to the BNG, the BNG is a source site of the OLT, and the OLT is a sink site of the BNG; when the OLT sends the service information carried by the wavelength of the service information corresponding to the OLT to the BNG, the BNG is a sink of the OLT, and the OLT is a source of the BNG, that is, the source and the sink are relatively speaking. When the first station is OLT2, OLT2 may be configured to receive service information carried by wavelengths of service information respectively corresponding to 4 BNGs sent by OLT1 of the previous hop station, where the wavelengths of the service information corresponding to the BNGs may be referred to as downlink wavelengths, and may send the service information carried by the wavelengths to be sent by the first station to the 4 BNGs; if the first site is the BNG2, the BNG2 may be configured to receive service information carried by the wavelengths of the service information corresponding to the 8 OLTs and sent by the BNG3 of the previous hop site, where the wavelength of the service information corresponding to the OLT may be an uplink wavelength, and the service information carried by the wavelength to be sent by the first site may be sent to the 8 OLTs.
Fig. 4 is a schematic diagram of an internal structure of a first station of the present application, in which the first station may include an Erbium-doped Fiber Amplifier (EDFA) 401, an Optical splitter 402, an Optical combiner 403, an Optical Add-drop multiplexer (OADM) 404, and a line card 405. The EDFA401 is configured to amplify an input wavelength, the optical splitter 402 is configured to distribute power to the wavelengths, the optical combiner 403 is configured to combine the wavelengths into one wavelength, the OADM404 is configured to distinguish each wavelength in the one wavelength, the line card 405 is configured to analyze the wavelengths and generate the wavelengths, and the line card 405 may include an Application Specific Integrated Circuit (ASIC) 4051 and may be configured to process signals.
The embodiment of the present application provides a method for multi-homing access to a network, which is described in the embodiments of the present application by taking a network architecture including an OLT and a BNG and a first station as the OLT. The OLT determines the wavelength of service information to be sent by the OLT, wherein the wavelength of the service information to be sent by the OLT comprises a subcarrier corresponding to each BNG; then, the OLT may send the service information carried by the wavelength of the service information to be sent by the OLT to each BNG, so that each BNG can analyze the sub-carrier corresponding to itself from the wavelength of the service information corresponding to the OLT. Meanwhile, the OLT may also receive service information carried by the wavelength of the service information corresponding to each BNG, and demodulate the subcarrier corresponding to the OLT from the wavelength of the service information corresponding to each BNG. Or, the OLT determines the wavelength of the service information to be sent by the OLT; then determining the time slot of each BNG according to the dispersion value corresponding to each BNG; and then the OLT respectively sends the service information carried by the wavelength of the service information to be sent by the OLT to each BNG according to the determined time slot of each BNG. The OLT may also receive the wavelength of the service information corresponding to each BNG, and demodulate the service information carried by the wavelength of the service information corresponding to each BNG according to the time slot allocated by the OLT.
In addition, in this embodiment of the application, the downlink wavelength corresponding to the OLT and the uplink wavelength corresponding to the BNG may be transmitted on the same optical fiber. If the downlink wavelength corresponding to the OLT and the uplink wavelength corresponding to the BNG are transmitted on two different optical fibers, the downlink and uplink wavelengths can be reused.
An embodiment of the present application provides a method for a multi-homing network in which a network architecture includes an OLT and a BNG and a first site is the OLT, as shown in fig. 5, the method includes:
501. and the first station receives the wavelength of the corresponding service information of each source station sent by the last hop station.
As shown in fig. 3, if the first site is OLT2, the previous hop site is OLT1, and the source site is BNG1-BNG4, the OLT2 may receive the wavelengths of the service information corresponding to BNG1-BNG4 through OLT 1. Wherein, the wavelengths of the business information corresponding to the BNG1-BNG4 include the wavelengths of all the business information transmitted by the BNG1-BNG4 to the OLT1-OLT 8. It should be noted that the first station may be any one of OLT1-OLT 8.
Similarly, as shown in fig. 3, if the first site is BNG3, the previous hop site is BNG4, and the source site is OLT1-OLT8, the BNG3 may receive the wavelengths of the service information corresponding to OLTs 1-8 through BNG4, where the wavelengths of the service information corresponding to OLTs 1-8 include the wavelengths of all the service information sent by OLTs 1-8 to BNG1-BNG 4. It should be noted that the first site can be any one of BNG1-BNG 4.
502. And the first station demodulates the sub-carriers corresponding to the first station from the wavelength of the service information corresponding to each source station.
According to the example in step 501, the OLT2 demodulates the sub-carriers corresponding to the OLT2 from the wavelengths of the traffic information corresponding to the BNGs 1-BNG 4.
As shown in fig. 6, the wavelengths of the service information corresponding to BNG1-BNG4 are downlink wavelengths λ 1- λ 8, and are respectively λ 1 and λ 2 corresponding to BNG 1; BNG2 corresponds to λ 3 and λ 4; BNG3 corresponds to λ 5 and λ 6; BNG4 corresponds to λ 7 and λ 8. And each λ includes subcarriers corresponding to 8 OLTs, for example, as shown in fig. 7, which is a schematic diagram of λ 1, and each two subcarriers in λ 1 correspond to one OLT. That is, the OLT2 parses out the subcarriers corresponding to the OLT2 from the received λ 1- λ 8, respectively. The sub-carriers may carry traffic information sent by each BNG to the first station.
In a possible design, as shown in fig. 8, which is a schematic diagram of an OLT and a schematic diagram of an internal structure of the OLT, when a downstream wavelength (λ 1- λ 8) sent by the BNG1-BNG4 reaches the OLT side, the downstream wavelength may be amplified by an EDFA in the OLT, then power distribution is performed by an optical splitter, the optical wavelength after the power distribution is divided into OADM portions entering 1 × 8, each light outlet of the OADM portion is connected to a Photodiode (PD), each PD portion obtains an electrical signal after photoelectric conversion, and the electrical signal is sampled by an Analog to Digital Converter (ADC) and then enters a signal processing unit for processing, so as to demodulate a subcarrier corresponding to the OLT in each wavelength of λ 1- λ 8.
In one possible design, the subcarriers may be Orthogonal Frequency Division Multiplexing (OFDM) subcarriers.
503. The first station allocates subcarriers to each sink station according to the bandwidth required by each sink station, and pre-estimates the corresponding dispersion value of each sink station when the subcarriers allocated by each sink station are transmitted to each sink station.
The first station may obtain a bandwidth required by each sink station, and when the first station sends a wavelength to each sink station, the first station may allocate subcarriers to each sink station according to the bandwidth required by each sink station. Meanwhile, the first station measures the distance from each host station to the first station, so that the corresponding dispersion value of each host station is pre-estimated when the first station transmits the subcarrier to each host station.
For example, assuming that there are 3 host stations, i.e., an a station, a B station, and a C station, the first station measures a distance from the first station to the a station of 25 km, a distance from the first station to the B station of 50 km, and a distance from the first station to the C station of 100km, the dispersion values corresponding to the a station, the B station, and the C station may be 500(ps/nm), 1000(ps/nm), and 2000(ps/nm), respectively. In general, the greater the distance from each of the sink sites to the first site, the greater the corresponding dispersion value for each of the sink sites.
504. The first station determines the wavelength of the service information to be sent by the first station according to the wavelength non-conflict distribution principle in the wavelength division multiplexing network.
The first station may select a wavelength that does not conflict with wavelengths of other stations as the wavelength of the service information to be transmitted.
505. And the first station determines the bandwidth required for transmitting the subcarrier corresponding to each sink station according to the dispersion value corresponding to each sink station, and adjusts the subcarrier distributed by each sink station according to the bandwidth required by each sink station.
The larger the dispersion value corresponding to each sink site is, the larger the bandwidth required by the first station to transmit the subcarrier corresponding to each sink site is. The first site adjusts the number n of subcarriers corresponding to each host site according to the bandwidth required by each host sitei(i＝1,2,…)，niIs a positive integer. The number n of subcarriers corresponding to each host siteiThe multiplication may be greater than the bandwidth required by each sink site.
As the transmission distance increases, a periodic Signal To Noise Ratio (SNR) degradation occurs in subcarriers of each frequency point (each subcarrier in subcarriers corresponding To each host site corresponds To one frequency point), and therefore when subcarriers are allocated, subcarriers of each sequence number (each subcarrier of each frequency point corresponds To one sequence number) need dispersion pre-compensation, the embodiment of the method further includes:
506. and the first station respectively carries out dispersion pre-compensation on the adjusted subcarriers corresponding to each host station according to the dispersion value corresponding to each host station.
The first station modulates the sub-carriers corresponding to each sink station on available wavelengths and transmits the modulated sub-carriers to each sink station through the optical transmitter of the first station. Each sink station measures the received SNR values for all subcarriers at that wavelength. Selecting n per sink siteiSubcarrier, average SNRavg of subcarrier corresponding to each host sitei(i ═ 1,2, …) two conditions need to be met: first, SNRavgiGreater than a first preset threshold, which may be 15dB, for example. Second, SNRavg between different host sitesiPhase differenceNot exceeding a second predetermined threshold, e.g., the second predetermined threshold may be 1dB, and if the two aforementioned conditions are not met, each of the sink sites may reselect niSub-carriers and determining n of reselectioniWhether the sub-carriers satisfy a condition. N after each host site will satisfy the conditioniThe first station is informed of the individual subcarriers.
The first station may use an in-phase quadrature (IQ) modulator to treat n corresponding to each destination station in the wavelength of the service information to be transmittediThe sub-carriers are respectively subjected to dispersion pre-compensation, and each sub-carrier can pre-compensate different dispersion values. For example, as shown in fig. 6, if the first site is BNG1, the sink sites are OLT1 to OLT8, the wavelength of the service information to be transmitted by BNG1 is λ 1, and the distances from BNG1 to OLT1 to OLT8 are 10km to 80km, respectively; the BNG1 pre-filters the sub-carriers corresponding to the OLTs 1 to OLTs 8 respectively in the lambda 1 according to the dispersion values corresponding to 10km to 80km respectively.
507. And the first site sends the service information carried by the subcarrier pre-compensated by each host site to the next hop site.
That is to say, after the first station performs dispersion pre-compensation on the subcarrier corresponding to each host station in the wavelength of the service information to be transmitted, the first station transmits the service information carried by the wavelength of the service information to be transmitted to the next hop station.
For example, as shown in fig. 9, the wavelength of the traffic information to be sent may be λ 9, and assuming that there are 4 sink sites, BNG1-BNG4, for each sink site, the sink site may receive λ 9 and resolve the subcarriers of the sink site in λ 9.
In one possible design, each sink station receives the subcarriers transmitted by the first station not directly, but through neighboring stations. For example, as shown in fig. 10, if the first station is OLT1, OLT1 needs to send the wavelength of the service information to be sent to OLT2, and then each station sequentially sends the service information carried by the wavelength of the service information to be sent to the next station until sending the service information to BNG 1.
In addition, as shown in fig. 10, when the first site is OLT1, OLT1 may send traffic information carried by an uplink wavelength (λ 9) to be sent by OLT1 to OLT2, and OLT1 may send traffic information carried by a downlink wavelength sent by BNG1-BNG4 to OLT2, so that OLT2 analyzes a subcarrier corresponding to OLT2 in the downlink wavelength sent by BNG1-BNG 4. When the first station is OLT2, OLT2 may send service information carried by the wavelength of service information to be sent by OLT2 to OLT3, and OLT2 may send service information carried by the downlink wavelength sent by BNG1-BNG4 and service information carried by the wavelength (λ 9) of service information to be sent by OLT1 to OLT3, so that OLT3 analyzes a subcarrier corresponding to OLT3 in the downlink wavelength sent by BNG1-BNG4, and sends service information carried by the uplink wavelength to be sent by OLT1 and OLT2, respectively, to the next station. Thus, in the case of such ring-wise sequential transmission, when the first station is OLT8, since the next hop station is BNG, OLT8 may transmit only the traffic information carried by the uplink wavelength transmitted by each OLT to BNG4, and when the first station is BNG4, BNG4 may transmit the traffic information carried by the uplink wavelength to BNG3 and the traffic information carried by the wavelengths (λ 1 and λ 2) of the traffic information to be transmitted by BNG4 to BNG3, and thus in the case of such ring-wise sequential transmission, when the first station is BNG1, since the next hop station is OLT, BNG1 may not transmit the traffic information carried by the uplink wavelength to OLT1, and transmit only the traffic information carried by the downlink wavelengths of BNG1-BNG4 to OLT 1.
In a possible design, when the downstream wavelength sent by the BNG1-BNG4 shown in fig. 11 reaches the OLT1 side, as shown in fig. 12, the downstream wavelength enters the 1x2 optical splitter after passing through the EDFA1 for power distribution, and then the optical wavelength after power distribution is divided into two paths, where the case of passing through the first optical outlet is already described in step 502 and is not described herein again, and the other path passes through the optical outlet 2 of the optical splitter, and then passes through the 1x2 optical combiner and the optical amplifier to be transmitted to the OLT 2. Meanwhile, the ASIC in the line card of the OLT1 is used as a signal processing unit, which converts the service information that the OLT1 needs to send to the BNGs 1-BNG4 into an analog electrical signal through a DAC (Digital analog Converter), and then modulates the analog electrical signal to the optical transmitter, so that the optical transmitter converts the analog electrical signal into wavelengths λ 9 and λ 10, and combines λ 9 and λ 10 by an optical combiner and transmits the combined signal to the EDFA2 through the same optical fiber, and the EDFA2 amplifies λ 9 and λ 10 and outputs the amplified signal to the next hop station, i.e., the OLT 2. In addition, when there are more than 2 optical transmitters, the optical transmitters can be coupled out through one optical combiner, and then wavelength combination can be performed through another optical combiner.
Therefore, when each station is in ring networking, the first station may determine the wavelength of the service information to be transmitted of the first station, where the wavelength of the service information to be transmitted includes the subcarrier of each host station after dispersion compensation, the first station pre-compensates the subcarrier corresponding to each host station according to the dispersion value corresponding to each host station, and then the first station transmits the service information carried by the subcarrier corresponding to each host station after compensation to each host station. Compared with the prior art that the composite wave dispersion compensation can not be carried out, the embodiment of the application can carry out the dispersion compensation respectively through the sub-carriers of the wavelength of the service information to be sent, thereby solving the problem that the composite wave dispersion compensation can not be carried out. And the first site can also receive the wavelength of the service information corresponding to each source site, and only analyzes the subcarrier corresponding to the first site, so that the number of optical transmitters at the source site side can be greatly reduced, and the cost is reduced.
In addition, as shown in fig. 13, a schematic diagram of a Network architecture of a Passive Optical Network (PON) technology with a tree structure is shown, where one OLT can access three BNGs. The distance between the stations is limited within 20km because the dispersion compensation cannot be carried out, and the crosstalk is caused by different stations, but the embodiment of the application can carry out the dispersion compensation, so that the crosstalk of different stations is reduced, and the distance between the stations can reach 100km or more.
An embodiment of the present application provides a method for a multi-homing network in which a network architecture includes an OLT and a BNG and a first site is the OLT, as shown in fig. 14, the method includes:
1401. and the first station receives the wavelength of the corresponding service information of each source station sent by the last hop station.
The specific process may refer to step 501, and it should be noted that the wavelength in step 1401 is different from the wavelength in step 501, the wavelength in step 501 may include multiple subcarriers, and the wavelength in step 1401 is sent to the next hop station in a time slot.
1402. And the first site demodulates the wavelength of the service information corresponding to the first site from the wavelength of the service information corresponding to each source site according to the time slot allocated by the first site.
Each source station allocates a wavelength, each source station point corresponds to a wavelength of the service information and transmits the service information in a time-division manner, and the first station demodulates the wavelength of the time slot corresponding to the first station from the wavelength of the service information corresponding to each source station point, that is, the first station demodulates the wavelength of the service information corresponding to each source station point in the time slot corresponding to the first station.
As shown in fig. 15, it is assumed that the source sites are BNG1, BNG2, and BNG3, respectively, each source site transmits the wavelength of the traffic information in 6 time slots, and the 6 time slots are t1, t2, t3, t4, t5, and t6, respectively. Among the wavelengths of the service information corresponding to the BNG1, the wavelengths of the time slot t1 and the time slot t4 are the time slots corresponding to the first station; among the wavelengths of the service information corresponding to the BNG2, the wavelengths of the time slot t2 and the time slot t5 are the time slots corresponding to the first station; of the wavelengths of the traffic information corresponding to the BNG3, the wavelengths of the time slot t3 and the time slot t6 are the time slots corresponding to the first station.
1403. The first station allocates time slots for each host station according to the bandwidth required by each host station, and pre-estimates the corresponding dispersion value of each host station when the wavelength of the service information to be sent is sent to each host station.
The first station may pre-store a bandwidth required by each sink station, and when the first station transmits a wavelength to the sink stations, a time slot may be allocated to each sink station according to the bandwidth required by each sink station, and the wavelength of each time slot corresponds to each sink station, so that the rates at which the wavelength transmitted by the first station reaches different sink stations are the same.
For example, assuming that the sink sites are BNG1, BNG2, and BNG3, respectively, the bandwidth required by the first site to acquire each sink site is 56Gbps for BNG1, 28Gbps for BNG2, and 22Gbps for BNG3, when the system specification index requires a certain time, 22 μ s,45 μ s, and 58 μ s of time slots may be allocated to BNG1, BNG2, and BNG3, respectively, so that the rate at which the wavelength of the service information to be transmitted by the first site reaches different sink sites is 10 Gbps.
The first station pre-estimates a dispersion value corresponding to each sink station when the wavelength of the service information to be transmitted is transmitted to each sink station, which may refer to step 503.
1404. The first station determines the wavelength of the service information to be sent by the first station according to the wavelength non-conflict distribution principle in the wavelength division multiplexing network.
That is, the first station selects a wavelength that does not conflict with wavelengths of other stations as the wavelength of the service information to be transmitted.
1405. And the first site determines the time slot for the first site to distribute the service information carried by the wavelength of the service information to be sent to each host site according to the dispersion value of each host site.
The larger the distance from the first station to each sink station is, the larger the dispersion value of each sink station is, and the larger the time slot allocated by the first station to the sink station with the larger dispersion value is.
1406. And the first site determines the bandwidth required for transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot according to the dispersion value corresponding to each host site.
The larger the dispersion value of each host site is, the smaller the bandwidth required by the first site to transmit the wavelength of the service information to be transmitted to each host site according to the allocated time slot is.
1407. And the first site adjusts the time slot allocated to each host site according to the bandwidth required by transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot.
The first station determines the time slot delta t allocated to each sink station according to the bandwidth required by each sink stationi，ΔtiThe multiplication by the unit slot bandwidth may be greater than the bandwidth required by each sink site.
1408. And the first site respectively performs dispersion pre-compensation on the time slot allocated to each adjusted host site according to the dispersion value corresponding to each host site, and determines the time slot of each host site after dispersion pre-compensation as the time slot for allocating the service information carried by the wavelength of the service information to be transmitted to each host site.
The larger the corresponding dispersion value of each host site is, the larger the time slot of each host site is after dispersion pre-compensation.
1409. And the first site sends the service information carried by the wavelength of the service information to be sent to the next hop site according to the adjusted time slot of each host site.
That is to say, the first station sends the service information carried by the wavelength of the service information to be sent to the next hop station according to the time slot of each host station after dispersion pre-compensation.
For example, as shown in fig. 16, assuming that the sink sites are BNG1, BNG2, and BNG3, respectively, the time slots of each sink site after the first site performs dispersion pre-compensation are: BNG1 corresponds to slots t1 and t4, BNG2 corresponds to slots t2 and t5, and BNG3 corresponds to slots t3 and t 6.
The first station sends the service information carried by the wavelength of the service information to be sent to the next hop station according to the time slot of each destination station, so that the service information carried by the wavelength can be sent to each destination station in a ring shape. Meanwhile, if the next hop site of the first site is not a sink site, that is, the first site is an OLT, and the next hop site is also an OLT site instead of a BNG site, the first site may send the service information carried by the wavelength of the service information corresponding to each BNG and the service information carried by the wavelength of the service information to be sent to the next hop site, so that the next hop site analyzes the service information carried by the wavelength of the service information corresponding to each BNG according to the time slot allocated by the next hop site, and continuously sends the service information carried by the wavelength of the service information to be sent to the next hop site; if the next-hop site of the first site is a sink site, that is, if the first site is the OLT, and the next-hop site is the BNG, the service information carried by the wavelength of the service information corresponding to each BNG does not need to be sent to the next-hop site, and the service information carried by the wavelength of the service information to be sent by each OLT may only be sent to the next-hop site.
Similarly, when the first site is a BNG and the next hop site is also a BNG, the first site may send, to the next hop site, the service information carried by the wavelength of the service information corresponding to each OLT and the service information carried by the wavelength of the service information to be sent by the BNG, so that the next hop site analyzes, according to the time slot allocated by the next hop site, the service information carried by the wavelength of the service information corresponding to each BNG, and continuously sends the service information carried by the wavelength of the service information to be sent to the next hop site; if the next-hop site of the first site is a host site, that is, the first site is a BNG, and the next-hop site is an OLT, it is not necessary to send the service information carried by the wavelength of the service information corresponding to each OLT to the next-hop site, and it is only necessary to send the service information carried by the wavelength of the service information to be sent by each BNG to the next-hop site.
Therefore, when each station is in ring networking, after the first station determines the wavelength of the service information to be sent by the first station, the service information carried by the wavelength of the service information to be sent is allocated to the time slot of each host station according to the dispersion value corresponding to each host station. In addition, compared with the problem of dispersion crosstalk between stations in the architecture diagram shown in fig. 13, which results in that the distance between stations is limited to 20km, in the embodiments of the present application, dispersion compensation may be performed on each station, so as to reduce crosstalk between different stations, and thus the distance between stations may reach 100km or more.
The scheme provided by the embodiment of the present application is mainly described from the perspective of the first station. It is understood that the first station contains corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those skilled in the art will readily appreciate that the algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the first site may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In the case of dividing each functional module by corresponding functions, fig. 17 shows a possible structural schematic diagram of the first station 17 in the above embodiment, where the first station includes: determination unit 1701, transmission unit 1702, allocation unit 1703, reception unit 1704, and demodulation unit 1705. Determining unit 1701 is configured to support the first station to perform processes 504-506 in fig. 5, processes 1404-1408 in fig. 14; a sending unit 1702 for supporting the first station to execute the process 507 in fig. 5, the process 1409 in fig. 14; an allocating unit 1703 is configured to support the first station to execute the process 503 in fig. 5, the process 1403 in fig. 14; receiving unit 1704 is configured to support the first station to perform process 501 in fig. 5, process 1401 in fig. 14; demodulation unit 1705 is configured to support the first station to perform process 502 in fig. 5, and process 1402 in fig. 14. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In the case of integrated units, fig. 4 shows a possible structural representation of the first station involved in the above-described embodiment. The first site includes: EDFA401, optical splitter 402, optical combiner 403, OADM404, and line card 405.
When EDFA401 is an amplifier, OADM is a multiplexer, and line card 405 is a processor, the first station according to the embodiment of the present application may be the first station shown in fig. 18.
Referring to fig. 18, the first station 18 includes: an amplifier 1801, an optical splitter 1802, an optical combiner 1803, a multiplexer 1804, a processor 1805, and a bus 1806. The amplifier 1801, the optical splitter 1802, the optical combiner 1803, the multiplexer 1804 and the processor 1805 are connected to each other through a bus 1806; the bus 1806 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 18, but this does not mean only one bus or one type of bus.
The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc read only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.
Those skilled in the art will recognize that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.
Claims (12)
1. A method of multi-homing access network, comprising:
a first station determines the wavelength of service information to be sent by the first station, wherein the wavelength of the service information to be sent by the first station comprises a subcarrier corresponding to each host station, and the subcarrier corresponding to each host station is pre-compensated according to a dispersion value corresponding to each host station;
the first station sends the service information carried by the subcarrier pre-compensated by each host station to a next hop station;
before the first station determines the wavelength of the service information to be sent by the first station, the method further includes: the first station allocates subcarriers to each sink station according to the bandwidth required by each sink station, and pre-estimates a dispersion value corresponding to each sink station when the subcarriers allocated to each sink station are sent to each sink station;
the first station determines a wavelength of service information to be sent by the first station, where the wavelength of the service information to be sent by the first station includes a subcarrier corresponding to each host station, and pre-compensating the subcarrier corresponding to each host station according to a dispersion value corresponding to each host station includes: the first station determines the wavelength of the service information to be sent of the first station according to the wavelength non-conflict allocation principle in the wavelength division multiplexing network; the first station determines, according to the dispersion value corresponding to each of the sink stations, a bandwidth required for transmitting the subcarrier corresponding to each of the sink stations; the first station adjusts the sub-carriers distributed by each host station according to the bandwidth required by the sub-carriers corresponding to each host station to be sent to each host station; and the first station respectively performs dispersion pre-compensation on the adjusted subcarriers corresponding to each host station according to the dispersion value corresponding to each host station.
2. The method of claim 1, further comprising:
the first station receives the wavelength of the corresponding service information of each source station sent by the last hop station;
and the first site demodulates the sub-carriers corresponding to the first site from the wavelength of the service information corresponding to each source site.
3. A method of multi-homing access network, comprising:
the first site determines the wavelength of service information to be sent of the first site, and allocates the service information carried by the wavelength of the service information to be sent to a time slot of each host site according to the dispersion value corresponding to each host site; and the first site sends the service information carried by the wavelength of the service information to be sent to the next hop site according to the adjusted time slot of each host site.
4. The method according to claim 3, wherein before the first station determines the wavelength of the service information to be transmitted by the first station, the method further comprises:
and the first site allocates a time slot to each host site according to the bandwidth required by each host site, and pre-estimates a dispersion value corresponding to each host site when the wavelength of the service information to be sent is sent to each host site.
5. The method according to claim 4, wherein the determining, by the first station, the wavelength of the service information to be sent by the first station, and adjusting, according to the dispersion value corresponding to each sink station, the time slot allocated to each sink station by the service information carried by the wavelength of the service information to be sent comprises:
the first station determines the wavelength of the service information to be sent of the first station according to the wavelength non-conflict allocation principle in the wavelength division multiplexing network;
the first station determines, according to the dispersion value corresponding to each host station, a bandwidth required for transmitting the wavelength of the service information to be transmitted to each host station according to the allocated time slot;
the first station adjusts the time slot allocated by each host station according to the bandwidth required by the transmission of the wavelength of the service information to be transmitted to each host station according to the allocated time slot;
and the first site respectively performs dispersion pre-compensation on the adjusted time slot allocated to each host site according to the dispersion value corresponding to each host site, and loads the time slot of each host site subjected to dispersion pre-compensation to the time slot for allocating the service information carried by the wavelength of the service information to be transmitted to each host site.
6. The method according to any one of claims 3-5, further comprising:
the first station receives the wavelength of the corresponding service information of each source station sent by the last hop station;
and the first site demodulates the wavelength of the service information corresponding to the first site from the wavelength of the service information corresponding to each source site according to the time slot allocated by the first site.
7. A first station, comprising:
a determining unit, configured to determine a wavelength of service information to be sent by a first site, where the wavelength of the service information to be sent by the first site includes a subcarrier corresponding to each host site, and precompensates the subcarrier corresponding to each host site according to a dispersion value corresponding to each host site;
a sending unit, configured to send service information carried by the subcarrier pre-compensated by each host station to a next hop station;
wherein the first site further comprises: a distributing unit, configured to distribute subcarriers to each sink site according to a bandwidth required by each sink site, and pre-estimate a dispersion value corresponding to each sink site when the subcarriers distributed by each sink site are sent to each sink site;
wherein the determination unit is configured to:
determining the wavelength of the service information to be sent of the first site according to a wavelength non-conflict distribution principle in a wavelength division multiplexing network;
determining a bandwidth required for transmitting the subcarrier corresponding to each sink site according to the dispersion value corresponding to each sink site;
adjusting the sub-carriers distributed by each host site according to the bandwidth required by the sub-carriers corresponding to each host site and transmitted to each host site;
and respectively carrying out dispersion pre-compensation on the adjusted sub-carriers corresponding to each host site according to the dispersion value corresponding to each host site.
8. The first station of claim 7, further comprising:
a receiving unit, configured to receive a wavelength of service information corresponding to each source station sent by a previous hop station;
and the demodulation unit is used for demodulating the subcarrier corresponding to the first site from the wavelength of the service information corresponding to each source site.
9. A first station, comprising:
a determining unit, configured to determine a wavelength of service information to be sent by a first site, and adjust, according to a dispersion value corresponding to each host site, a time slot for allocating service information carried by the wavelength of the service information to be sent to each host site;
and the sending unit is used for sending the service information carried by the wavelength of the service information to be sent to the next hop site according to the adjusted time slot of each host site.
10. The first station of claim 9, further comprising:
and the allocation unit is used for allocating time slots to each host site according to the bandwidth required by each host site and pre-estimating a dispersion value corresponding to each host site when the wavelength of the service information to be sent is sent to each host site.
11. The first station of claim 10, wherein the determining unit is configured to:
determining the wavelength of the service information to be sent of the first site according to a wavelength non-conflict distribution principle in a wavelength division multiplexing network;
determining a bandwidth required for transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot according to the dispersion value corresponding to each host site;
adjusting the time slot allocated to each host site according to the bandwidth required for transmitting the wavelength of the service information to be transmitted to each host site according to the allocated time slot;
and respectively carrying out dispersion pre-compensation on the time slots distributed by each adjusted host site according to the dispersion value corresponding to each host site, and carrying the time slots of each host site subjected to dispersion pre-compensation to the time slots distributing the service information carried by the wavelength of the service information to be sent to each host site.
12. A first station according to any of claims 9 to 11, characterised in that the first station further comprises:
a receiving unit, configured to receive a wavelength of service information corresponding to each source station sent by a previous hop station;
and the demodulation unit is used for demodulating the wavelength of the service information corresponding to the first site from the wavelength of the service information corresponding to each source site according to the time slot allocated by the first site.
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| US20090238578A1 (en) * | 2007-10-09 | 2009-09-24 | Michael George Taylor | apparatus and method of compensating for compact digital domain chromatic dispersion |
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