WO2013108578A1 - 波長帯域割当方法 - Google Patents
波長帯域割当方法 Download PDFInfo
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- WO2013108578A1 WO2013108578A1 PCT/JP2012/084107 JP2012084107W WO2013108578A1 WO 2013108578 A1 WO2013108578 A1 WO 2013108578A1 JP 2012084107 W JP2012084107 W JP 2012084107W WO 2013108578 A1 WO2013108578 A1 WO 2013108578A1
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- 230000003287 optical effect Effects 0.000 claims description 9
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- 238000004891 communication Methods 0.000 claims description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0247—Sharing one wavelength for at least a group of ONUs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0098—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0084—Quality of service aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Definitions
- the present invention relates to a wavelength band allocation method in WDM / TDM-PON.
- the PON Passive Optical Network
- FTTH Fiber To The Home
- the wavelength band allocation efficiency is low because not all the bands of a plurality of operating wavelengths are used. Even if all the bands of a plurality of operating wavelengths are used, the subscribers' allocated bandwidths are not necessarily the same even though the subscribers have the same subscription service class. There was still unfairness between them.
- the present invention increases the wavelength band allocation efficiency, eliminates unfairness among subscribers, and cancels excess bandwidth and insufficient bandwidth in the variable wavelength WDM / TDM-PON.
- the purpose is to perform appropriate and appropriate bandwidth allocation.
- a plurality of subscriber devices are connected to one station side device, and each subscriber device transmits an upstream signal of any one of a plurality of wavelengths prepared in advance to the station side.
- a wavelength band allocating method performed by the station-side device in a passive optical communication network in which the station-side device receives an uplink signal of any wavelength among a plurality of wavelengths prepared in advance from each subscriber device.
- a wavelength determining step for determining a plurality of wavelengths of uplink signals from each subscriber unit to the station side unit so as to guarantee a guaranteed bandwidth according to a subscription service class of each subscriber unit; All the bands of the plurality of wavelengths determined in the wavelength determining step are distributed as reference bands to the subscriber devices according to the subscription service classes of the subscriber devices, and the subscription services having the same subscription service class are distributed.
- the wavelength band allocation efficiency can be increased and unfairness among subscribers can be eliminated.
- the weight of the subscription service class of each subscriber device is obtained by dividing the band of one wavelength by the maximum number of the subscriber devices accommodated by one wavelength.
- a wavelength band allocating method characterized in that a value obtained by multiplying is used as a guaranteed band according to the subscription service class of each subscriber unit.
- each subscriber device can at least guarantee a guaranteed bandwidth according to the subscription service class.
- the reference band distribution step as the subscription service class of each subscriber apparatus increases, the number of wavelengths having a band distributed as a reference band to each subscriber apparatus increases.
- the plurality of wavelengths determined in the wavelength determination step when the number of the plurality of wavelengths determined in the wavelength determination step is less than the number of subscription service classes of each subscriber unit, the plurality of wavelengths determined in the wavelength determination step A band of one wavelength among the wavelengths is distributed to two or more higher-level subscription service classes of each subscriber device according to the subscription service class of each subscriber device. This is a wavelength band allocation method.
- each subscriber device can be assigned more reference bandwidth as the subscription service class increases, and can be assigned the same reference bandwidth if the subscription service class is the same.
- the surplus bandwidth for each subscriber device whose reference bandwidth is more than the requested bandwidth is distributed to each subscriber device whose request bandwidth is more than the reference bandwidth.
- the present invention calculates a bandwidth request receiving step for receiving a bandwidth request from each of the subscriber devices and a difference between the requested bandwidth and the reference bandwidth of each of the subscriber devices, so that the reference bandwidth is more than the requested bandwidth.
- a difference calculating step for calculating an excess bandwidth for each of the subscriber devices in which an excess bandwidth and a required bandwidth for each of the subscriber devices are more than a reference bandwidth, in order after the reference bandwidth distribution step. This is a wavelength band allocation method.
- the present invention provides a surplus bandwidth distribution step for distributing the surplus bandwidth for each of the subscriber devices whose reference bandwidth is surplus from the required bandwidth to each of the subscriber devices whose request bandwidth is surpassing the reference bandwidth,
- the wavelength band allocation method is provided after the difference calculation step.
- the surplus bandwidth for each of the subscriber devices whose reference bandwidth is more than the requested bandwidth is set to each of the subscriber devices whose requested bandwidth is more than the reference bandwidth, etc.
- This is a wavelength band allocation method characterized in that distribution is performed in minutes.
- the surplus bandwidth can be distributed regardless of the difference between the reference bandwidth and the requested bandwidth and the subscription service class.
- the present invention provides a surplus bandwidth for each of the subscriber devices whose reference bandwidth is more than the requested bandwidth, for each subscriber device whose requested bandwidth is more than the reference bandwidth.
- the wavelength band allocation method is characterized in that the higher the subscription service class, the greater the distribution.
- each subscriber device can distribute more surplus bandwidth.
- the present invention provides a surplus bandwidth for each of the subscriber devices whose reference bandwidth is more than the requested bandwidth, for each subscriber device whose requested bandwidth is more than the reference bandwidth.
- the wavelength band allocation method is characterized in that a larger number of required bands than a reference band are distributed.
- each subscriber device can distribute more surplus bandwidth.
- wavelength band allocation efficiency can be increased, unfairness among subscribers can be eliminated, and appropriate band allocation can be performed so as to cancel out band surplus and band shortage.
- FIGS. 1-10 Outline of wavelength band allocation method A diagram showing the configuration of the PON of the present invention is shown in FIG. Flow charts showing the wavelength band allocation method of the present invention are shown in FIGS.
- PON includes n ONUs 1-1, 1-2, 1-3, 1-4,..., 1-n, OLT2, n transmission lines 3-1, 3-2, 3-3, 3-4,..., 3-n, a transmission path 4, and a power splitter 5.
- the OLT 2 includes a wavelength filter 21, m receivers 22-1, 22-2,..., 22-m, a wavelength determination unit 23, a reference band distribution unit 24, a band request reception unit 25, A difference calculation unit 26 and a surplus bandwidth distribution unit 27 are included.
- Each ONU 1 transmits an upstream signal of any one of a plurality of wavelengths ⁇ 1 ,..., ⁇ m prepared in advance to the OLT 2.
- the OLT 2 receives an upstream signal of any wavelength among the plurality of wavelengths ⁇ 1 ,..., ⁇ m prepared in advance from each ONU 1.
- Transmission lines 3-1,..., 3-n connect the ONUs 1-1,.
- the transmission line 4 connects the OLT 2 and the power splitter 5.
- Wavelength filter 21 the upstream signals from the ONU1 to OLT 2, the wavelength lambda 1, ⁇ ⁇ ⁇ , distributing the optical signal of lambda m.
- Receiver 22-1, ⁇ , 22-m respectively wavelengths lambda 1, ⁇ ⁇ ⁇ , receives the optical signal of lambda m.
- Each receiver 22 is an LC (Line Card) or the like. In this way, WDM / TDM-PON is configured.
- the number of receivers 22 to be operated is set to the minimum (for example, one).
- the number of receivers 22 to be operated is increased in accordance with the increase in the number of users and the demand of some users, and users that cannot be accommodated in the existing receivers 22 are accommodated in the new receivers 22.
- the total bandwidth provided by the operating receiver 22 is virtually regarded as the total bandwidth of a group of PONs, and the bandwidth is distributed to each ONU 1.
- the wavelength determining unit 23 determines a plurality of wavelengths of the uplink signal from each ONU 1 to the OLT 2 so as to guarantee a guaranteed bandwidth according to the subscription service class of each ONU 1 (step S4).
- the reference band distribution unit 24 distributes all bands of the plurality of wavelengths determined by the wavelength determination unit 23 to the respective ONUs 1 as reference bands according to the subscription service classes of the respective ONUs 1, and each ONU 1 having the same subscription service class. Are the same (step S5).
- step S4 and step S5 the wavelength determination unit 23 and the reference band distribution unit 24 detect each ONU 1 (step S1) and grasp the subscription status of each ONU 1 to the subscription service class (step S2). If there is a change in the subscription status (YES in step S3), steps S4 and S5 are performed. If there is no change in the subscription status (NO in step S3), it is not necessary to perform steps S4 and S5.
- the bandwidth request receiving unit 25 receives a bandwidth request from each ONU 1 (step S6).
- the difference calculation unit 26 calculates the difference between the requested bandwidth and the reference bandwidth of each ONU 1, and calculates the surplus bandwidth for each ONU 1 whose reference bandwidth is surplus from the requested bandwidth and the excess bandwidth for each ONU 1 whose surplus bandwidth is greater than the reference bandwidth. Calculate (step S7).
- the surplus bandwidth distribution unit 27 distributes the surplus bandwidth for each ONU 1 whose reference bandwidth is surplus from the request bandwidth to each ONU 1 whose request bandwidth is surplus than the reference bandwidth (step S8).
- step S4 performed by the wavelength determining unit 23 and step S5 performed by the reference band distributing unit 24, the wavelength band allocation efficiency can be increased and unfairness among subscribers can be eliminated in the wavelength tunable WDM / TDM-PON.
- step S8 performed by the surplus bandwidth distribution unit 27 appropriate bandwidth allocation can be performed in the wavelength tunable WDM / TDM-PON so as to offset the surplus bandwidth and the lack of bandwidth.
- FIG. 4 shows details of the wavelength determination step S4. Assume that ONU1-1,..., 1-7 are arranged as ONU1.
- the subscription service classes of ONU 1-1,..., 1-7 are class 1, 2, 2, 2, 3, 3, 4 respectively. It is assumed that the maximum number of ONUs 1 accommodated by one receiver 22 is eight. The bandwidth of one receiver 22 is assumed to be 1.
- the wavelength determining unit 23 multiplies the value 1/8 obtained by dividing the band 1 of one wavelength ⁇ by the maximum number of ONUs 1 accommodated by one wavelength ⁇ by the weight of the subscription service class of each ONU 1.
- the guaranteed bandwidth corresponds to the subscription service class of each ONU 1.
- the wavelength determination unit 23 sets the guaranteed bandwidths corresponding to the ONU 1-1,..., 1-7 subscription service classes to 1/8, 2/8, 2/8, 2/8, 3/8, 3 / 8, 4/8.
- the total guaranteed bandwidth corresponding to the subscription service classes of the ONUs 1-1, 1-7 is 17/8, and is guaranteed by the three wavelengths ⁇ of the upstream signal from each ONU 1 to the OLT 2. Therefore, receivers 22-1, 22-2, and 22-3 that receive optical signals of wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 are operated.
- the receiver 22-1 accommodates ONU1-1,..., 1-5 (for ONU1-5, the band 1/8 is accommodated)
- the receiver 22-2 includes ONU1-5, ..., 1-7 is accommodated (for ONU 1-5, the band 2/8 is accommodated, and for ONU 1-7, the band 3/8 is accommodated), and the receiver 22-3 receives the ONU 1-7 (Band 1/8 is accommodated). Then, the receiver 22-3 has room to accommodate the band 7/8. Therefore, a reference band distribution step S5 is performed.
- FIG. 5 shows details of the reference band distribution step S5.
- the wavelength ⁇ k accommodates only each ONU 1 whose subscription service class is k or more. That is, the wavelength ⁇ 1 accommodates each ONU 1-1,..., 1-7 having a subscription service class of 1 or more, and the wavelength ⁇ 2 includes each ONU 1-2,. , 1-7, and the wavelength ⁇ 3 accommodates each ONU 1-5,..., 1-7 having a subscription service class of 3 or more.
- the band of each wavelength ⁇ determined in the wavelength determination step S4 is equally distributed to each ONU 1 that distributes the band of each wavelength ⁇ determined in the wavelength determination step S4 as a reference band. That is, the band of wavelength ⁇ 1 is equally distributed to each ONU 1-1,..., 1-7, and the band of wavelength ⁇ 2 is distributed to each ONU 1-2,. Evenly distributed. However, the band possessed by the wavelength ⁇ 3 is distinguished from each of the ONUs 1-5, 1-6, and 1-7 by the subscription service classes 3, 3 , and 4, so that the ONUs 1-5, 1-6, and 1-7 are distinguished from each other. Tilt distributed.
- the band of one wavelength ⁇ among the plurality of wavelengths ⁇ determined in the wavelength determination step S4 is Distribution is performed according to the subscription service class of each ONU 1 with respect to two or more upper subscription service classes of the ONU 1.
- the number of the plurality of wavelengths ⁇ determined in the wavelength determination step S4 is 3, the number of subscription service classes of each ONU 1 is 4, and the former is less than the latter. Therefore, the bandwidth of the wavelength ⁇ 3 is that of each ONU 1-5, 1-6, 1-7 with respect to the two upper subscription service classes 3, 4 of each ONU 1-5, 1-6, 1-7. Distribution is made according to the respective subscription service classes 3, 3, and 4.
- the distribution ratio for each ONU 1-5, 1-6, 1-7 may be 3: 3: 4 faithfully to the respective subscription service class, and for example, 1: 1 in order to differentiate each subscription service class more. : 2 may be sufficient, and other ratios may be sufficient.
- the distribution ratio for each of the ONUs 1-5, 1-6, and 1-7 is 1: 1: 2.
- the guaranteed bandwidth shown in FIG. 4 is a guaranteed bandwidth on the subscription service class.
- the reference band shown in FIG. 5 is an actual guaranteed band in the number of receivers 22 to be operated at a certain point in time and the subscription status at a certain point in time to the subscription service class of each ONU 1.
- the guaranteed bandwidth may not be able to effectively use the bandwidth of all the operating receivers 22, but the reference bandwidth may be the maximum use of the bandwidth of all the operating receivers 22. it can.
- FIGS. 6 and 7 show details of the difference calculation step S7.
- Each ONU 1 does not necessarily request a band equal to the reference band, but may request a band smaller than the reference band, or may request a band larger than the reference band.
- FIG. 6 shows a case where the requested bandwidth is smaller than the reference bandwidth for ONU 1-5.
- the entire reference band is allocated to the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 as reference bands F51, F52, and F53, respectively.
- the entire request band is equally allocated to the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 as request bands R51, R52, and R53, respectively.
- excess bands S51, S52, and S53 are generated for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively.
- FIG. 7 shows a case where the requested bandwidth is larger than the reference bandwidth for ONU 1-5.
- the entire reference band is allocated to the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 as reference bands F51, F52, and F53, respectively.
- the entire request band is equally allocated to the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 as request bands R51, R52, and R53, respectively.
- insufficient bands D51, D52, and D53 are generated for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively.
- FIGS. 8 and 9 show details of the surplus bandwidth distribution step S8.
- the reference bands for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 in each ONU 1 are the reference bands shown in FIG. 8 and 9, the required bands for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 in each ONU 1-1,..., 1-6 are the same, but the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ in the ONU 1-7 are the same.
- the required bandwidth for 3 is different.
- FIG. 8 will be described, and then FIG. 9 will be described.
- FIG. 8 will be described.
- Each ONU 11, ⁇ ⁇ ⁇ , reference band F11 with respect to the wavelength lambda 1 in the 1-7, F21, F31, F41, F51, F61, F71 is 0.143.
- Each ONU1-2, ⁇ ⁇ ⁇ , the reference band F22, F32, F42, F52, F62, F72 for the wavelength lambda 2 in 1-7 is 0.167.
- Reference band F 53, F 63 with respect to the wavelength lambda 3 in each ONU1-5,1-6 is 0.250.
- Reference band F73 with respect to wavelength lambda 3 in ONU1-7 is 0.500.
- the entire requested bandwidth in each ONU 1-1,..., 1-7 is 0.200, 0.200, 0.286, 0.334, 0.300, 1.000, and 0.700, respectively.
- Insufficient bandwidth D11 with respect to the wavelength lambda 1 in ONU1-1 is 0.057.
- the surplus bands S21 and S22 for the wavelengths ⁇ 1 and ⁇ 2 in the ONU 1-2 are 0.043 and 0.067, respectively.
- the surplus band S32 for the wavelength ⁇ 2 in the ONU 1-3 is 0.024.
- Reference band F31 and the requested bandwidth R31 with respect to the wavelength lambda 1 in ONU1-3 are equal, no surplus or shortage of bandwidth.
- Insufficient bandwidth D41 with respect to the wavelength lambda 1 in ONU1-4 is 0.024.
- Reference band F42 and the requested bandwidth R42 with respect to the wavelength lambda 2 in ONU1-4 are equal, no surplus or shortage of bandwidth.
- the surplus bands S51, S52, and S53 for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 in the ONU 1-5 are 0.043, 0.067, and 0.150, respectively.
- Insufficient bands D61, D62, and D63 for wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 in ONU 1-6 are 0.190, 0.166, and 0.083, respectively.
- the shortage bands D71 and D72 and the surplus band S73 for the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 in the ONU 1-7 are 0.090, 0.066, and 0.267, respectively.
- the wavelength ⁇ 1 will be described.
- the sum of the surplus bandwidths S21 and S51 of each ONU 1-2 and 1-5 is 0.086.
- the wavelength ⁇ 2 will be described.
- the sum of the surplus bandwidths S22, S32, S52 of each ONU 1-2, 1-3, 1-5 is 0.158.
- the wavelength ⁇ 3 will be described.
- the sum of the surplus bandwidths S53 and S73 of each ONU 1-5 and 1-7 is 0.417.
- the shortage band D63 of the ONU 1-6 is 0.083. Since the total surplus bandwidth is larger than the total shortage bandwidth, the surplus bandwidth can compensate for the lack bandwidth. Therefore, the insufficient bandwidth D63 is permitted as an additional bandwidth for the ONU 1-6. Therefore, the actual bandwidth for each ONU 1-5,..., 1-7 is 0.100, 0.333, 0.233.
- FIG. 9 will be described.
- the reference band for each ONU 1 is the same in FIGS.
- the entire required bandwidth in each ONU 1 is the same in FIGS.
- the entire requested bandwidth in each ONU 1-1,..., 1-6 is distributed in the same manner in FIGS.
- the entire requested bandwidth in ONU1-7 is first supplemented by reference band F71 with respect to the wavelength lambda 1, then supplemented by reference band F72 with respect to the wavelength lambda 2, and then supplemented by reference band F73 with respect to the wavelength lambda 3.
- the surplus bandwidth or insufficient bandwidth for each ONU 1-1,..., 1-6 is the same as in FIGS.
- Reference band F71 and the requested bandwidth R71 with respect to the wavelength lambda 1 in ONU1-7 are equal, no surplus or shortage of bandwidth.
- Reference band F72 and the requested bandwidth R72 with respect to the wavelength lambda 2 in ONU1-7 are equal, no surplus or shortage of bandwidth.
- Surplus bandwidth S73 with respect to the wavelength lambda 3 in ONU1-7 is 0.110.
- the wavelength ⁇ 1 will be described.
- the sum of the surplus bandwidths S21 and S51 of each ONU 1-2 and 1-5 is 0.086.
- the wavelength ⁇ 2 will be described.
- the sum of the surplus bandwidths S22, S32, S52 of each ONU 1-2, 1-3, 1-5 is 0.158.
- the wavelength ⁇ 3 will be described.
- the sum of the surplus bandwidths S53 and S73 of each ONU 1-5 and 1-7 is 0.260.
- the shortage band D63 of the ONU 1-6 is 0.083. Since the total surplus bandwidth is larger than the total shortage bandwidth, the surplus bandwidth can compensate for the lack bandwidth. Therefore, the insufficient bandwidth D63 is permitted as an additional bandwidth for the ONU 1-6. Therefore, the actual bandwidth for each ONU 1-5,..., 1-7 is 0.100, 0.333, 0.390.
- the sum of the bands distributed to each ONU 1 for wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 may exceed 1.
- the upper limit of the bandwidth allocated to each ONU 1 in a certain time zone is 1, so that the wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 are distributed to each ONU 1 .
- the difference between the sum of the bands and the upper limit of the band allocated to each ONU 1 in a certain time slot is discarded.
- the surplus bandwidth for each ONU 1 whose reference bandwidth is surplus from the required bandwidth is equally distributed to each ONU 1 whose request bandwidth is surplus than the reference bandwidth. Therefore, the surplus bandwidth can be distributed regardless of the difference between the reference bandwidth and the requested bandwidth and the subscription service class.
- the surplus bandwidth for each ONU 1 whose reference bandwidth is surplus from the requested bandwidth is set higher for each ONU 1 whose request bandwidth is surpassed than the reference bandwidth. Many may be distributed. Therefore, as the subscription service class becomes higher, each ONU 1 can distribute more surplus bandwidth.
- the surplus bandwidth for each ONU 1 whose reference bandwidth is surplus from the request bandwidth is set to the required bandwidth for each ONU 1 whose request bandwidth is surpassing the reference bandwidth. You may distribute more, so that it is excessive. Therefore, each ONU 1 can distribute more surplus bandwidth as the difference between the reference bandwidth and the required bandwidth increases.
- the wavelength band allocation method according to the present invention is suitable for performing appropriate band allocation in a wavelength tunable WDM / TDM-PON.
- ONU 2 OLT 3: Transmission path 4: Transmission path 5: Power splitter 21: Wavelength filter 22: Receiver 23: Wavelength determination unit 24: Reference band distribution unit 25: Band request acceptance unit 26: Difference calculation unit 27: Surplus band distribution unit
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Abstract
Description
本発明のPONの構成を示す図を図1に示す。本発明の波長帯域割当方法を示すフローチャートを図2及び図3に示す。
波長決定ステップS4の詳細を示す図を図4に示す。ONU1として、ONU1-1、・・・、1-7が配置されているとする。ONU1-1、・・・、1-7の加入サービスクラスは、それぞれクラス1、2、2、2、3、3、4とする。1台の受信器22が収容するONU1の最大個数を8個とする。1台の受信器22が有する帯域を1とする。
基準帯域分配ステップS5の詳細を示す図を図5に示す。各ONU1の加入サービスクラスが増加するに従って、各ONU1に基準帯域として分配する帯域を有する波長λの数が増加する。これは、既存の波長λは、下位の加入サービスクラスの各ONU1をも収容してもよいが、新たな波長λは、上位の加入サービスクラスの各ONU1のみ収容すべきである、という考え方に基づくものである。具体的には、波長λkは、加入サービスクラスがk以上の各ONU1のみ収容する。つまり、波長λ1は、加入サービスクラスが1以上の各ONU1-1、・・・、1-7を収容し、波長λ2は、加入サービスクラスが2以上の各ONU1-2、・・・、1-7を収容し、波長λ3は、加入サービスクラスが3以上の各ONU1-5、・・・、1-7を収容する。
差分計算ステップS7の詳細を示す図を図6及び図7に示す。各ONU1は、基準帯域に等しい帯域を要求するとは限らず、基準帯域より少ない帯域を要求することもあり、基準帯域より多い帯域を要求することもある。
余剰帯域分配ステップS8の詳細を示す図を図8及び図9に示す。図8及び図9では、各ONU1における波長λ1、λ2、λ3に対する基準帯域は、図5で示した基準帯域である。図8及び図9では、各ONU1-1、・・・、1-6における波長λ1、λ2、λ3に対する要求帯域は同一であるが、ONU1-7における波長λ1、λ2、λ3に対する要求帯域は異なる。まず図8について説明し、次に図9について説明する。
2:OLT
3:伝送路
4:伝送路
5:パワースプリッタ
21:波長フィルタ
22:受信器
23:波長決定部
24:基準帯域分配部
25:帯域要求受付部
26:差分計算部
27:余剰帯域分配部
Claims (9)
- 一の局側装置に複数の加入者装置が接続され、前記各加入者装置は予め用意された複数の波長のうちいずれかの波長の上り信号を前記局側装置に送信し、前記局側装置は予め用意された複数の波長のうちいずれの波長の上り信号も前記各加入者装置から受信する受動光通信網において、前記局側装置が行なう波長帯域割当方法であって、
前記各加入者装置の加入サービスクラスに応じた保証帯域を保証するように、前記各加入者装置から前記局側装置への上り信号の複数の波長を決定する波長決定ステップと、
前記波長決定ステップで決定した複数の波長が有する全帯域を、前記各加入者装置の加入サービスクラスに応じて前記各加入者装置に基準帯域として分配し、加入サービスクラスが同一である前記各加入者装置の基準帯域を同一とする基準帯域分配ステップと、
を順に備えることを特徴とする波長帯域割当方法。 - 前記波長決定ステップでは、一の波長が有する帯域を、一の波長が収容する前記加入者装置の最大個数で除算した値に、前記各加入者装置の加入サービスクラスの重みを乗算した値を、前記各加入者装置の加入サービスクラスに応じた保証帯域とすることを特徴とする請求項1に記載の波長帯域割当方法。
- 前記基準帯域分配ステップでは、前記各加入者装置の加入サービスクラスが増加するに従って、前記各加入者装置に基準帯域として分配する帯域を有する波長の数が増加し、前記波長決定ステップで決定した各波長が有する帯域が、前記波長決定ステップで決定した各波長が有する帯域を基準帯域として分配する前記各加入者装置に等分に分配されることを特徴とする請求項1又は2に記載の波長帯域割当方法。
- 前記基準帯域分配ステップでは、前記波長決定ステップで決定した複数の波長の数が前記各加入者装置の加入サービスクラスの数より少ないとき、前記波長決定ステップで決定した複数の波長のうち一の波長が有する帯域が、前記各加入者装置の2つ以上の上位の加入サービスクラスに対して、前記各加入者装置の加入サービスクラスに応じて分配されることを特徴とする請求項3に記載の波長帯域割当方法。
- 前記各加入者装置から帯域要求を受け付ける帯域要求受付ステップと、
前記各加入者装置の要求帯域及び基準帯域の差分を計算し、基準帯域が要求帯域より余剰である前記各加入者装置に対する余剰帯域及び要求帯域が基準帯域より過剰である前記各加入者装置に対する過剰帯域を計算する差分計算ステップと、
を前記基準帯域分配ステップの後に順に備えることを特徴とする請求項1から4のいずれかに記載の波長帯域割当方法。 - 基準帯域が要求帯域より余剰である前記各加入者装置に対する余剰帯域を、要求帯域が基準帯域より過剰である前記各加入者装置に対して分配する余剰帯域分配ステップ、
を前記差分計算ステップの後に備えることを特徴とする請求項5に記載の波長帯域割当方法。 - 前記余剰帯域分配ステップでは、基準帯域が要求帯域より余剰である前記各加入者装置に対する余剰帯域を、要求帯域が基準帯域より過剰である前記各加入者装置に対して等分に分配することを特徴とする請求項6に記載の波長帯域割当方法。
- 前記余剰帯域分配ステップでは、基準帯域が要求帯域より余剰である前記各加入者装置に対する余剰帯域を、要求帯域が基準帯域より過剰である前記各加入者装置に対して、前記加入サービスクラスが高いほど多く分配することを特徴とする請求項6に記載の波長帯域割当方法。
- 前記余剰帯域分配ステップでは、基準帯域が要求帯域より余剰である前記各加入者装置に対する余剰帯域を、要求帯域が基準帯域より過剰である前記各加入者装置に対して、要求帯域が基準帯域より過剰であるほど多く分配することを特徴とする請求項6に記載の波長帯域割当方法。
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