JP2021158515A - Resource allocation apparatus, resource allocation program, resource allocation method and station-side device - Google Patents

Abstract

To efficiently allocate resources to an optical line termination part in accordance with a traffic status to be used for a service by a subscriber-side device.SOLUTION: A resource allocation device in the present invention comprises: a plurality of optical line termination means each for constructing a virtual passive network for each service, allocating a band in accordance with a request band to each service of each accommodated subscriber-side device and terminating an optical signal of a different wavelength; traffic monitor means for monitoring a traffic status of each virtual passive network of each subscriber-side device to receive each service; and resource allocation means for determining a wavelength to accommodate each subscriber-side device by determining an allocation band of each subscriber-side device of each virtual passive network on the basis of the request band to each service of each subscriber-side device and the traffic status of each virtual passive network of each subscriber-side device receiving each service.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resource allocation device, a resource allocation program, a resource allocation method, and a station-side device. For example, a station-side device that allocates resources (wavelength and band) in order to construct a virtual PON (Passive Optical Network). Applicable.

In the optical access network, a passive optical subscriber network (PON) system is known. FIG. 7 illustrates the overall configuration of the PON system. In a PON system, an optical network unit (OLT) and a plurality of subscriber optical network units (ONUs) are connected by an optical fiber through an optical network unit called an optical splitter. There is.

Various multiplex techniques are used in PON systems. As one of the multiplexing technologies used in the PON system, time division multiplexing (TDM) technology that allocates a short section on the time axis to each subscriber and wavelength division multiplexing (TDM) that allocates different wavelengths to each subscriber (TDM) WDM: Wavelength Division Multiplex) technology and the like. Currently, the most widely used technology in PON systems is TDM technology.

In the PON system, the signal transmitted from the OLT to each ONU (hereinafter, also referred to as “downstream signal”) is branched by an optical splitter and transmitted to each ONU. On the other hand, the signal sent from each ONU to the OLT (hereinafter, also referred to as “uplink signal”) is combined by an optical splitter and transmitted to the OLT.

A typical PON system is a Gigabit Ethernet PON (GE-PON) system (see Non-Patent Document 1). In the GE-PON system, when an ONU is connected to a PON, the OLT automatically discovers the ONU, assigns the ONU an LLID (Logical Link.ID), and automatically establishes a communication link. Here, the LLID is an identifier of a logical link established between the OLT and each ONU.

In the PON system, a DBA (Dynamic Bandwidth Allocation) function and a DWA (Dynamic Wavelength Allocation) function are known as ONU band allocation functions (see Non-Patent Document 2).

DBA is a function that dynamically allocates a band according to the amount of transmission data of the ONU. For example, as illustrated in FIG. 8, when four ONUs # 1 to ONU # 4 are communicating, the entire band is allocated to the ONUs by a quarter. When two ONUs # 1 and ONU # 2 are communicating, the entire band is allocated to the ONU by half. In this way, the bandwidth can be used without waste by allocating the bandwidth to the ONU according to the traffic situation. DWA is a function that dynamically controls the wavelength assigned to each ONU. The functions of DBA and DWA are implemented in OLT.

Further, in the current optical access network, in addition to the demand for increasing the capacity of the network due to the increase in mobile traffic and the expansion of the use of video contents, the construction of a highly efficient network is required. Therefore, "NG-PON2" was standardized in 2015 as a next-generation optical access system.

FIG. 9 illustrates the basic configuration of NG-PON2. The basic system of NG-PON2 is a TDM technology consisting of a plurality of OSUs (Optical Subscriber Units; for example, 10 Gbps per OSU) having DWA and DBA functions, a wavelength / optical duplexer, an optical fiber, and an ONU. It is a TWDM-PON system that combines WDM technology with.

The TWDM-PON system has a feature that it can flexibly respond to the addition of services by accommodating a plurality of services at the same wavelength or adding OSUs (wavelengths). For example, it is possible to reduce the OSU to be driven when the traffic amount is small and to accommodate the ONU. For example, in the example of FIG. 10, when the traffic amount is small, the three OSUs # 1, OSU # 2, and OSU # 3 that have been driven up to that point are reduced to one OSU # 1, and the OSU # 1 is It is designed to accommodate ONU # 1 to ONU # 3. In addition, it is possible to restore communication by changing the OLT to be connected in the event of a failure.

In recent years, attention has been paid to virtualization of optical access systems. There is Patent Document 1 as a virtualization technique of a PON system. Patent Document 1 stores a correspondence between an ONU or an OLT and a VPID (Virtual PON Individual) that identifies a virtual PON (virtual passive optical network). For example, the VPIDs of ONU # 1 and ONU # 2 are ". When the VPID of OSU # 1 is "1" in "1", ONU # 1 and ONU # 2 belong to the virtual PON "1". Furthermore, when the same ONU requests multiple services, that is, when it has multiple LLIDs, a VPID is prepared for each LLID, and if the VPID stored in each LLID matches the VPID on the OSU side, that is the case. Communicates as a virtual PON.

Further, there is Patent Document 2 as a method for determining the wavelength of ONU in a virtual PON system. The description technique of Patent Document 2 determines the vPON parameter (wavelength of ONU, allocated band of ONU) from the required band of ONU and the type of virtual PON to which the ONU receives a service. It is possible to operate the OSU with low power consumption by allocating the ONUs having the largest required bandwidth values to the OSUs in order.

For example, FIG. 11A is information showing the relationship between the type of virtual PON (vPON) to which each of the six ONUs (ONU # 1 to ONU # 6) receives a service and the required bandwidth of each ONU. 11 (B) shows the bands allocated to the three OSUs # 1 to OSU # 3 from the information in FIG. 11 (A). Here, the bandwidth that can be accommodated per OSU is set to 8 Gbps.

From FIG. 11A, the total bandwidth of ONU # 1 is 4 [Gbps], the total bandwidth of ONU # 2 is 1 [Gbps], the total bandwidth of ONU # 3 is 1 [Gbps], and the total bandwidth of ONU # 4 is 1 [Gbps]. The total bandwidth of 5 [Gbps] and ONU # 5 is 3 [Gbps], the total bandwidth of ONU # 6 is 2 [Gbps], and the bandwidth that can be accommodated by one OSU is 8 [Gbps]. OSU # 1 and OSU # 2 are driven. Then, the bandwidth of each ONU is allocated in descending order of the total required bandwidth of the ONU so as not to exceed the accommodateable bandwidth of each OSU (OSU # 1 and OSU # 2) and to reduce the free bandwidth as much as possible. Then, it becomes as shown in FIG. 11 (B).

Japanese Unexamined Patent Publication No. 2008-227985 JP-A-2019-169804

"Technical Basic Course GE-PON Technology 2nd IEEE802.3ah Standard", NTT Journal, September 2005, pp. 91-94 "Technical Basic Course GE-PON Technology 3rd DBA Function", NTT Journal, October 2005, pp. 67-70 "Forefront of Global Standards Standardization Trends for Further Acceleration of PON Systems", NTT Journal, August 2017, pp. 51-53

However, the wavelength allocation method described in Patent Document 2 is limited to the case where the ONU band allocation policy is guaranteed (fixed). The traffic amount of the ONU is not always constant, and the time zone frequently used for the service (for example, the peak demand band value in FIG. 12B) and the time zone when it is not (for example, the average demand band in FIG. 12A) Value) and. A wavelength allocation method for accommodating such a service is not disclosed in Patent Document 2.

Further, when the conventional method is applied and the wavelength is assigned by the average value of the ONU in FIG. 12 (A), the wavelength is assigned as shown in FIG. 13 (A), and ONU # 1 and ONU # 2 are assigned according to the required band. Can't do. In FIG. 13, the accommodating bandwidth per OSU is set to 10 Gbps.

Further, for example, when the wavelength is assigned by the peak value of ONU in FIG. 12 (B), the wavelength is assigned as shown in FIG. 13 (B), and vPON # 4 of ONU # 3 to ONU # 8 has an increased free band and There is a problem that the wavelength used increases and the power consumption increases.

In view of the above-mentioned problems, the present invention is intended to enable efficient allocation of resources to the end of the optical line according to the traffic situation used by the subscriber-side device for the service. be.

In order to solve such a problem, the first resource allocation device of the present invention constructs a virtual passive network for each service and allocates bandwidth according to the required bandwidth for each service of each subscriber side device to be accommodated. , Multiple optical line termination means for terminating optical signals of different wavelengths, traffic monitoring means for monitoring the traffic status of each virtual passive network of each subscriber side device receiving each service, and each subscriber side device. Based on the required bandwidth for each service and the traffic status of each virtual passive network of each subscriber side device receiving each service, the allocated bandwidth of each subscriber side device of each virtual passive network is set. It is characterized by comprising a resource allocation means for determining and determining a wavelength for accommodating each subscriber-side device.

The second resource allocation program of the present invention constructs a virtual passive network for each service of the computer, allocates a band according to the required band for each service of each subscriber side device that accommodates the computer, and allocates a band according to the required band for each service, and each has a different wavelength. A plurality of optical line termination means for terminating optical signals, a traffic monitoring means for monitoring the traffic status of each virtual passive network of each subscriber side device receiving each service, and a request for each service of each subscriber side device. Based on the bandwidth and the traffic status of each virtual passive network of each subscriber side device receiving each service, the allocated bandwidth of each subscriber side device of each virtual passive network is determined, and each subscription is made. It is characterized in that it functions as a resource allocation means for determining a wavelength for accommodating a computer-side device.

In the third resource allocation method of the present invention, each of the plurality of optical line termination means constructs a virtual passive network for each service, and bandwidths according to the required bandwidth for each service of each subscriber-side device that accommodates the service. The traffic monitoring means monitors the traffic status of each virtual passive network of each subscriber side device that receives each service, and the resource allocation means is on each subscriber side. Allotted bandwidth of each subscriber device of each virtual passive network based on the required bandwidth for each service of the device and the traffic status of each virtual passive network of each subscriber device receiving each service. Is determined, and the wavelength for accommodating each subscriber-side device is determined.

The fourth station-side device of the present invention constructs a virtual passive network for each service, allocates a band according to the required band for each service of each subscriber-side device that accommodates the service, and outputs optical signals having different wavelengths. Multiple optical line termination means to terminate, traffic monitoring means to monitor the traffic status of each virtual passive network of each subscriber side device receiving each service, required bandwidth for each service of each subscriber side device, and Based on the traffic status of each virtual passive network of each subscriber side device receiving each service, the allocated bandwidth of each subscriber side device of each virtual passive network is determined, and each subscriber side device is determined. It is characterized by providing a resource allocation means for determining a wavelength for accommodating the above.

According to the present invention, resources can be efficiently allocated to the end of the optical line according to the traffic situation used by the subscriber-side device for the service.

It is an overall configuration diagram which shows the overall configuration of the PON system which concerns on 1st Embodiment. It is a flowchart which shows the operation of the wavelength allocation processing which concerns on 1st Embodiment. In the first embodiment, it is a figure which shows the average bandwidth value and the peak bandwidth value of each ONU which receives a service in each virtual PON. In the first embodiment, it is a figure which shows the actual traffic amount (traffic counter value) of each ONU which receives a service in each virtual PON at time t = t0 and t1. In the first embodiment, it is a figure which shows the result of the band setting value of each ONU which receives a service in each virtual PON at time t = t0, and the allocation result. In the first embodiment, it is a figure which shows the result of the band setting value and the allocation result of each ONU which receives a service in each virtual PON at time t = t1. The overall configuration of a conventional PON system is illustrated. It is explanatory drawing explaining the conventional DBA function. The basic configuration of the conventional NG-PON2 will be illustrated. It is explanatory drawing explaining the process which reduces OSU when the traffic volume is small in the conventional TWDM-PON system. It is explanatory drawing explaining the resource allocation of Patent Document 2. FIG. It is explanatory drawing explaining the solution problem (the 1). It is explanatory drawing explaining the solution problem (the 2).

(A) First Embodiment Hereinafter, the first embodiment of the resource allocation device, the resource allocation program, the resource allocation method, and the station-side device according to the present invention will be described in detail with reference to the drawings.

(A-1) Configuration of First Embodiment FIG. 1 is an overall configuration diagram showing an overall configuration of a PON system according to the first embodiment.

In FIG. 1, the PON system 9 according to the first embodiment includes a virtual PON management device 10, a station-side optical network unit (OLT) 20 as a master station device installed in a telecommunications carrier's station building, and a wavelength. It has a duplexer 30, a subscriber-side optical network unit (ONU) 40-1 to 40-N as a slave station device (N is a positive integer), and an optical splitter 50.

The OLT 20 and the optical splitter 50 are connected via an optical fiber common to all ONUs 40-1 to 40-N, and the optical splitter 50 and each ONU40-1 to 40-N are individually connected. It is connected via the optical fiber of.

[Virtual PON management device, virtual PON request unit]
The virtual PON management device 10 includes a virtual PON requesting unit 11. The virtual PON management device 10 requests the OLT 20 to allocate resources (wavelength and band) in units of virtual PON. For example, when the virtual PON management device 10 receives a bandwidth allocation request for an end user (ONU40) who provides a service from an MVNO (Mobile Virtual Network Operator) operator via a network (not shown), the virtual PON management device 10 receives a bandwidth allocation request from the OLT 20. Request the allocation of resources to build a virtual PON.

The virtual PON request unit 11 requests the resource allocation unit 21 of the OLT 20 to construct a virtual PON (virtual passive optical network). The virtual PON request unit 21 refers to the resource allocation unit 21 with respect to the type of virtual PON (vPON) to which each ONU 40 receives a service and the peak request bandwidth value for each virtual PON (hereinafter, also referred to as “peak bandwidth value”). It has a role of notifying information including the average required bandwidth value for each virtual PON (hereinafter, also referred to as “average bandwidth value”).

The peak required bandwidth value (peak bandwidth value) is the maximum value of the required bandwidth values requested by the ONU 40, which receives the service provided by the virtual PON, to receive the service within a predetermined time.

The average required bandwidth value (average bandwidth value) is the average value of the required bandwidth values requested by the ONU 40, which receives the service provided by the virtual PON within the predetermined time and within the predetermined time, to receive the service. ..

Here, the virtual PON is constructed for each service provided by each business operator. In other words, the ONU 40 that receives the service of the business operator belongs to the virtual PON constructed for each service. Further, when one business operator provides a plurality of services, a virtual PON is constructed for each service, so that the business operator constructs a plurality of PONs. Further, one ONU 40 can receive a plurality of services at the same time, and in that case, the ONU 40 belongs to a plurality of virtual PONs for each service at the same time.

[OLT]
The OLT 20 may be provided with a dedicated IC chip or the like equipped with the components illustrated in FIG. 1 as hardware, or may be configured as software centering on a CPU and a program executed by the CPU. However, functionally, it can be represented in FIG.

In FIG. 1, the OLT 20 includes a resource allocation device 200. The resource allocation device 200 includes a resource allocation unit 21, a plurality of (for example, four in FIG. 1) OSUs 22-1 to 22-4, and a traffic counter unit 26.

Note that FIG. 1 illustrates a case where four OSUs 22 are provided, but the present invention is not limited to this. Further, when a specific OSU is described separately from a plurality of OSUs 22-1 to OSU22-4, it is expressed as, for example, "OSU22-1" or "OSU # 1", and common processing is performed without distinguishing the OSUs. In the description, it is expressed as "OSU22".

Further, the number of drives of the OSU 22 corresponds to the number of wavelengths determined by the resource allocation unit 21.

Further, FIG. 1 shows an example in which the resource allocation unit 21 and / or the traffic counter unit 26 are configured inside the OLT 20, but as a modification, the resource allocation unit 21 is inside the virtual PON management device 10. And / or the traffic counter unit 26 may be configured.

(Resource allocation department)
The resource allocation unit 21 receives a request for resource allocation for each virtual PON from the virtual PON request unit 11 and allocates resources to each virtual PON. That is, the resource allocation unit 21 determines the allocated bandwidth of each ONU 40 that receives the service in the virtual PON, and allocates the wavelength to each ONU 40 belonging to each virtual PON.

Here, the resource allocation unit 21 provides information on the type of virtual PON (vPON) to which each ONU 40 receives a service from the virtual PON request unit 11, the peak bandwidth value for each virtual PON, and the average bandwidth value for each virtual PON. And also obtains information on the current traffic status from the traffic counter unit 26.

Then, the resource allocation unit 11 determines the allocated bandwidth of each ONU 40 to be serviced by each virtual PON based on the peak bandwidth value and the average bandwidth value for each virtual PON and the information on the current traffic status. Further, the resource allocation unit 11 determines the wavelength to be allocated to each ONU 40 by using the allocated band of each ONU 40 that receives the service in each virtual PON. A detailed description of the resource allocation method by the resource allocation unit 11 will be given in the section of operation.

(OSU)
The OSU 22 is an optical line terminal that performs optical communication with the accommodated ONU 40. The OSU 22 performs optical communication at different wavelengths, allocates time slots according to the band of each ONU 40 to be accommodated, and transmits the data addressed to each ONU 40 by time division multiplexing. For example, OSU22-m or OSU # m (m is a number from "1" to "4") shall use the wavelength λm.

The OSU 22 has a DBA unit 24 (24-1 to 24-4) and an optical transmission / reception unit 25 (25-1 to 25-4).

The DBA unit 24 dynamically allocates a band according to the amount of transmission data addressed to each ONU 40 to be accommodated. The DBA unit 24 performs DBA calculation according to a predetermined DBA algorithm within the maximum allocated bandwidth of each virtual PON transmitted from the resource allocation unit 21, dynamically allocates the bandwidth of each ONU 40, and allocates the result to the optical transmitter / receiver 25. Send to. In addition, the DBA unit 24 notifies the traffic counter unit 26 of information regarding the amount of transmitted data addressed to each ONU 40 accommodated.

The optical transmitter / receiver 25 converts the DBA calculation result into an optical signal and transmits it from the DBA unit 24.

(Traffic counter section)
The traffic counter unit 26 acquires information on the amount of transmission data of each ONU 40 accommodated from the DBA unit 25 provided in each OSU 22, and is the actual of each ONU 40 receiving service in each virtual PON at the current time. The traffic amount (also referred to as “traffic counter value”) is derived, and the traffic counter value for each ONU 40 receiving service in each virtual PON is notified to the resource allocation unit 21. That is, the traffic counter unit 26 notifies the resource allocation unit 21 of the actual traffic status of each ONU 40 receiving each service at the current time.

[Wavelength duplexer]
The wavelength combiner / demultiplexer 30 combines the optical signals transmitted from OSU22-1 to OSU22-4 and transmits them to each ONU40.

(A-2) Operation of First Embodiment [Basic Flow of Wavelength Allocation Processing]
FIG. 2 is a flowchart showing the operation of the wavelength allocation process according to the first embodiment.

The resource allocation unit 21 determines the band of ONU # i (1 ≦ i ≦ N) to be serviced by each virtual PON (vPON # k: 1 ≦ k ≦ L: L is a positive integer) according to the flowchart of FIG. do. Then, the resource allocation unit 21 determines the wavelength to be assigned to each ONU # i from the determined band value of each ONU # i.

First, the resource allocation unit 21 receives from the virtual PON request unit 11 the type of virtual PON (vPON) to which each ONU 40 receives a service, the peak bandwidth value for each virtual PON (vPON), and the average bandwidth value for each virtual PON (vPON). To get. Further, the resource allocation unit 21 acquires the actual traffic amount (traffic counter value) of each ONU 40 receiving the service in each virtual PON from the traffic counter unit 26 (S101).

Here, the parameters are defined as follows.

"Av_vPON _k _ONU _i ": Average request band of ONU # i receiving service of vPON # k "Pe_vPON _k _ONU _i ": Peak request band of ONU # i receiving service of vPON # k "Re_t _n _vPON _k _ONU _i " : Actual traffic amount (traffic counter value) of each ONU # i at time tn
"Cal_vPON _k _ONU _i": band set value of ONU # i to receive the service on each vPON # k.

The resource allocation unit 11 compares the actual traffic amount Re_t _n _vPON _k _ONU _{i of} ONU # i receiving the service of vPON # k with the average band value Av_vPON _k _ONU _{i of the} ONU # i receiving the service of vPON # k ( S102).

Then, when the actual traffic amount of ONU # i receiving the service of vPON # k is larger than the average band value of ONU # i receiving the service of vPON # k (that is, Re_t _n _vPON _k _ONU _i > Av_vPON _k _ONU _i : S102 / YES), the resource allocation unit 21 derives the first band value of ONU # i that receives the service of vPON # k according to the equation (1) (S103).

First band value = (Pe_vPON _k _ONU _i + Av_vPON _k _ONU _i ) / 2 ... (1)
The first band value is an average value of the peak band value and the average band value of ONU # i that receives the service of vPON # k.

Next, the resource allocation unit 21 compares the first band value of the ONU # i that receives the service of vPON # k with the actual traffic amount Re_t _n _vPON _k _ONU _{i of the ONU # i that receives the service of vPON # k.} (S104).

Then, when the first band value of ONU # i receiving the service of vPON # k is larger than the actual traffic amount of ONU # i receiving the service of vPON # k (that is, (Pe_vPON _k _ONU _i + Av_vPON _k _ONU _i ) / 2> In the case of Re_t _n _vPON _k _ONU _i ; S104 / YES), the resource allocation unit 21 sets the peak request band of ONU # i to receive the service of vPON # k and the band of ONU # i to receive the service of vPON # k. Set value (S105).

That is, it can be determined that the ONU # i receiving the service of vPON # k is in a situation where the traffic of the service is increasing and the required bandwidth for the service is increasing at this point. Therefore, in order to satisfy the required band of the ONU # i that receives the service of vPON # k, the peak request band of the ONU # i that receives the service of vPON # k is set to the band setting of the ONU # i that receives the service of vPON # k. Let it be a value.

On the other hand, when the first band value of the ONU # i that receives the service of vPON # k is not larger than the actual traffic amount of the ONU # i that receives the service of vPON # k (S105 / NO), the resource allocation unit 21 sets the vPON. The average requested band of ONU # i that receives the service of #k is set as the band setting value of ONU # i that receives the service of vPON # k (S106).

In S102, when the actual traffic amount of ONU # i receiving the service of vPON # k is not larger than the average band value of ONU # i receiving the service of vPON # k (S102 / NO), the resource allocation unit 21 sets the vPON. Let the average requested band of ONU # i receiving the service of #k and the band setting value of ONU # i receiving the service of vPON # k (S106).

Resource allocation unit 21 uses a band set value Cal_vPON _k _ONU _i of ONU # i served by VPON # k, determines the wavelength assigned to each ONU 40 (S107).

Specifically, the resource assignment unit 21 uses the band set value Cal_vPON _k _ONU _i of ONU # i served by VPON # k, determining the total request bandwidth value of each ONU # i.

Then, for example, the resource allocation unit 21 determines the allocation wavelength in order from the ONU 40 having the largest total band value. The method is not limited to this method as long as it can reduce the number of OSUs 22 to be driven to save power.

[Specific operation example]
Next, the operation of the wavelength allocation processing of the first embodiment will be described with specific reference. In the following, in the PON system 9, the number of OSUs 22 is three, and the number of ONUs 40-1 to ONU40-8 (hereinafter referred to as "ONU # 1" to "ONU # 8") is eight. And. The bandwidth that can be accommodated by one OSU22 is 10 Gbps. The number of OSUs 22, the bandwidth that can be accommodated, the number of ONUs 40, and the like are not limited to this.

FIG. 3A shows the average bandwidth value of each ONU receiving service in each virtual PON in the first embodiment, and FIG. 3B shows the service in each virtual PON in the first embodiment. It is a figure which shows the peak band value of each ONU which receives.

As for the types of virtual PON, virtual PON (vPON # 1) is service S1, virtual PON (vPON # 2) is service S2, virtual PON (vPON # 3) is service S3, and virtual PON (vPON # 4) is service. Let it be S4.

FIG. 4 is a diagram showing an actual traffic amount (traffic counter value) of each ONU receiving a service at each virtual PON at the current time in the first embodiment. FIG. 4A shows the actual traffic amount of each ONU at the time t = t0, and FIG. 4B shows the actual traffic amount of each ONU at the time t = t1.

[S101]
The resource allocation unit 21 acquires the information illustrated in FIGS. 3 (A) and 3 (B) from the virtual PON request unit 11.

[When time t = t0]
The resource allocation unit 21 acquires the actual traffic amount (FIG. 4A) of each ONU 40 from the traffic counter unit 26 at the current time (t = t0).

(Services S1 to S3)
With reference to FIGS. 3 (A) and 4 (A), the average bandwidth value and the actual traffic amount (traffic counter value) of each ONU # 1 to # 8 receiving each of the services S1 to S3 are assigned to the resource allocation unit. 21 is compared (S102).

_{In this case, since the value of each actual traffic amount Re_t n} _vPON _k _ONU _i of each ONU # 1 to # 8 receiving each of the services S1 to S3 is equal to the value of the corresponding average band value Av_vPON _k _ONU _{i, S102} determination is NO, the value of Cal_vPON _k _ONU _{i is} a value of Av_vPON k _{_ONU i} (S106).

(Service S4)
With reference to FIGS. 3A and 4A, the resource allocation unit 21 compares the average bandwidth value of each ONU # 1 to # 8 receiving the service S4 with the actual traffic amount (traffic counter value). (S102).

_{In FIG. 4A, the values of the actual traffic amounts Re_t n} _vPON _k _ONU _i of ONU # 1 to ONU # 3 are 1.8 [Gbps], 1.5 [Gbps], and 0.6 [Gbps], respectively. Yes, since it is larger than the average band value of each ONU # 1 to # 3 in FIG. 3 (A) (S102 / YES), the process shifts to S103.

_{On the other hand, the values of the actual traffic amounts Re_t n} _vPON _k _ONU _i in FIGS. 4 (A) ONU # 4 to ONU # 8 are all 0.4 [Gbps], and each ONU # 4 to in FIG. 3 (A). Since it is smaller than the average band value of each of ONU # 38 (S102 / NO), the processing shifts to S106. Then, the value _{of Cal_vPON k} _ONU _i of each of ONU # 4 to # 8 that receives the service S4 becomes the value of _{Av_vPON k} _ONU _{i (S106).}

Next, in S103, the first band amount of each of ONU # 1 to ONU # 3 that receives the service 4 is calculated.

Here, a specific example in the case of ONU # 1 receiving the service 4 will be described. For example, in FIG. 3 (B), the value of the peak bandwidth value Pe_vPON _k _ONU _i of ONU # 1 to receive a service 4 is 2 [Gbps], the value of the average bandwidth value Av_vPON _k _ONU _i is 0.5 [Gbps] Is.

Therefore, from the equation (1), the first band value of ONU # 1 that receives the service 4 = (Pe_vPON _k _ONU _i + Av_vPON _k _ONU _i ) / 2 = (2 + 0.5) / 2 = 1.25 [Gbps]. .. Similarly, the first band values of ONU # 2 and ONU # 3 that receive the service 4 are also 1.25 [Gbps], respectively (S103).

In S104, each first band value of ONU # 1 to ONU # 3 belonging to service 4 is compared with each actual traffic amount of ONU # 1 to ONU # 3 belonging to service 4 of FIG. 4 (A).

Then, the actual traffic volumes of ONU # 1 and ONU # 2 belonging to the service 4 are 1.8 [Gbps] and 1.5 [Gbps], respectively. Therefore, since the first bandwidth value 1.25 [Gbps] of ONU # 1 and ONU # 2 belonging to service 4 is smaller than the actual traffic volume of ONU # 1 and ONU # 2 belonging to service 4, the determination of S105 is YES. It becomes. _{That is, the values of Cal_vPON k} _ONU _i of each of ONU # 1 and ONU # 2 that receive the service S4 are the values of Pe_vPON _k _ONU _i (that is, 2 [Gbps], respectively) (S107).

The actual traffic volume of ONU # 3 belonging to the service 4 is 0.6 [Gbps]. Since the first bandwidth value 1.25 [Gbps] of the ONU # 3 belonging to the service 4 is larger than the actual traffic amount of the ONU # 3 belonging to the service 4, the determination of S105 is NO. _{That is, the value of Cal_vPON k} _ONU _i of ONU # 3 that receives the service S4 becomes the value of Av_vPON _k _ONU _i (that is, 0.5 [Gbps]) (S107).

FIG. 5A is a diagram showing the result of the band setting value of each ONU 40 receiving the service at each virtual PON at the time t = t0.

In the above example, each ONU # 1 to ONU # 8 in which the resource allocation unit 21 receives each of the services S1 to S4 with reference to FIGS. 3 (A), 3 (B), and 4 (A). The result of calculating each band setting value of is as shown in FIG. 5 (A).

Then, the resource allocation unit 21 determines the number of allocated wavelengths so as to reduce the number of OSUs 22 to be driven.

For example, the resource allocation unit 21 obtains the value of each of the total required bands of ONU # 1 to ONU # 8 with reference to FIG. 5A, and determines the wavelength in order from the one having the largest value of the total requested band. .. Here, the band that can be accommodated by one OSU 22 is 10 [Gbps]. Therefore, the value of the total required band of one or a plurality of ONUs accommodated in one OSU 22 is set to 10 [Gbps].

More specifically, as shown in FIG. 5A, the total required band values of ONU # 1 to ONU # 8 are 2.5 [Gbps], 4 [Gbps], 2 [Gbps], and 3. It becomes 5 [Gbps], 2 [Gbps], 2.5 [Gbps], 1 [Gbps], and 0.5 [Gbps]. Therefore, wavelengths are assigned in the order of ONU # 2, ONU # 4, ONU # 1, ONU # 6, ONU # 3, ONU # 5, ONU # 7, and ONU # 8. As a result, the wavelength allocation result as shown in FIG. 5 (B) is obtained.

[When time t = t1]
The resource allocation unit 21 acquires the actual traffic amount (FIG. 4B) of each ONU 40 from the traffic counter unit 26 at the current time (t = t1).

(Services S1 to S3)
With reference to FIGS. 3 (A) and 4 (B), the average bandwidth value and the actual traffic amount (traffic counter value) of each ONU # 1 to # 8 receiving each of the services S1 to S3 are assigned to the resource allocation unit. 21 is compared (S102).

_{In this case, since the value of each actual traffic amount Re_t n} _vPON _k _ONU _i of each ONU # 1 to # 8 receiving each of the services S1 to S3 is equal to the value of each corresponding Av_vPON _k _ONU _i , the determination of S102 is made. NO, and the value of each Cal_vPON _k _ONU _i is a value of each Av_vPON _k _ONU _i (S106).

(Service S4)
With reference to FIGS. 3A and 4B, the resource allocation unit 21 compares the average bandwidth value of each ONU # 1 to # 8 receiving the service S4 with the actual traffic amount (traffic counter value). (S102).

In FIG. 4B _{, the values of the actual traffic amounts Re_t n} _vPON _{k _ONU i} of ONU # 1 to ONU # 4 are 0.7 [Gbps], 1.8 [Gbps], 1.6 [Gbps], respectively. Since it is 0.6 [Gbps], which is larger than the average band value of each ONU # 1 to # 4 in FIG. 3 (A) (S102 / YES), the process shifts to S103.

_{On the other hand, the values of the actual traffic amounts Re_t n} _vPON _k _ONU _i in FIGS. 4 (B) ONU # 5 to ONU # 8 are 0.4 [Gbps], and each ONU # 5 to in FIG. 3 (A). Since it is smaller than the average band value of ONU # 8 (S102 / NO), the processing shifts to S106. Then, the value _{of each Cal_vPON k} _ONU _i of ONU # 5 to ONU # 8 that receives the service S4 becomes the value of _{Av_vPON k} _ONU _{i (S106).}

Next, in S103, the first band amount of each of ONU # 1 to ONU # 4 that receives the service 4 is calculated. Then, the first band values of ONU # 1 to ONU # 4 that receive the service 4 are 1.25 [Gbps], respectively (S103).

In S104, the first band value of ONU # 1 to ONU # 4 belonging to the service 4 is compared with the actual traffic amount of the ONU # 1 to ONU # 4 belonging to the service 4 of FIG. 4 (B).

Then, the actual traffic volumes of ONU # 2 and ONU # 3 belonging to the service 4 are 1.8 [Gbps] and 1.6 [Gbps], respectively. Therefore, since the first bandwidth value 1.25 [Gbps] of ONU # 2 and ONU # 3 belonging to service 4 is smaller than the actual traffic volume of ONU # 2 and ONU # 3 belonging to service 4, the determination of S105 is YES. It becomes. _{That is, the values of Cal_vPON k} _ONU _i of each of ONU # 2 and ONU # 3 that receive the service S4 are the values of Pe_vPON _k _ONU _i (that is, 2 [Gbps], respectively) (S107).

The actual traffic volumes of ONU # 1 and ONU # 4 belonging to the service 4 are 0.7 [Gbps] and 0.6 [Gbps], respectively. Since the first bandwidth value 1.25 [Gbps] of ONU # 1 and ONU # 4 belonging to service 4 is larger than the actual traffic volume of ONU # 1 and ONU # 4 belonging to service 4, the determination of S105 is NO. .. _{That is, the value of Cal_vPON k} _ONU _i of each of ONU # 1 and ONU # 4 receiving the service S4 is the value of Av_vPON _k _ONU _i (that is, 0.5 [Gbps]) (S107).

FIG. 6B is a diagram showing the result of the band setting value of each ONU 40 receiving the service at each virtual PON at the time t = t1.

In the above example, each ONU # 1 to ONU # 8 in which the resource allocation unit 21 receives each of the services S1 to S4 with reference to FIGS. 3 (A), 3 (B), and 4 (B). The result of calculating each band setting value of is shown in FIG. 6 (A).

Then, the resource allocation unit 21 determines the number of allocated wavelengths so as to reduce the number of OSUs 22 to be driven.

For example, the resource allocation unit 21 obtains the value of each of the total required bands of ONU # 1 to ONU # 8 with reference to FIG. 6A, and determines the wavelength in order from the one having the largest value of the total requested band. .. Here, the band that can be accommodated by one OSU 22 is 10 [Gbps]. Therefore, the value of the total required band of one or a plurality of ONUs accommodated in one OSU 22 is set to 10 [Gbps].

Specifically, as shown in FIG. 6A, the total required band values of ONU # 1 to ONU # 8 are 1 [Gbps], 4 [Gbps], 3.5 [Gbps], and 3.5, respectively. It becomes [Gbps], 2 [Gbps], 2.5 [Gbps], 1 [Gbps], 0.5 [Gbps]. Therefore, considering the accommodating band of one OSU 22, wavelengths are assigned in the order of ONU # 2, ONU # 3, ONU # 6, ONU # 4, ONU # 5, ONU # 1, ONU # 7, and ONU # 8. .. As a result, the wavelength allocation result as shown in FIG. 6 (B) is obtained.

Comparing FIGS. 5 and 6 and FIG. 13 described above, according to this embodiment, as shown in FIGS. 5 and 6, the required bandwidth of each ONU 40 is satisfied, and the drive OSU is driven more than before. It is possible to reduce the wavelength allocation.

(B-3) Effect of Second Embodiment As described above, according to the first embodiment, the set band value used for the ONU wavelength allocation calculation is calculated as the peak band value or the average band value from the traffic counter value. However, by allocating wavelengths, the number of drive OSUs can be reduced as compared with the conventional case, and power consumption can be reduced.

(C) Other Embodiments In the first and second embodiments, an example in which a plurality of OSUs and ONUs having different wavelengths are configured is shown, but a PON configuration using a plurality of OLTs having the same wavelength may also be used. Further, there is no problem even if the above PON is arranged in the mobile front hall.

10 ... Virtual PON management device, 11 ... Virtual PON request unit, 20 ... OLT, 200 ... Resource allocation device, 21 ... Resource allocation unit, 22-1 to 22-4 ... OSU, 24-1 to 24-4 ... DBA unit , 25-1 to 25-4 ... Optical transmitter / receiver, 26 ... Traffic counter section, 30 ... Wavelength duplexer, 50 ... Optical splitter, 40-1 to 40-N ... ONU.

In order to solve such a problem, the first resource allocation device of the present invention constructs a virtual passive network for each service and allocates bandwidth according to the required bandwidth for each service of each subscriber side device to be accommodated. , Multiple optical line termination means for terminating optical signals of different wavelengths, traffic monitoring means for monitoring the traffic status of each virtual passive network of each subscriber side device receiving each service, and each subscriber side device. Depending on the traffic status of each virtual passive network corresponding to each service, each subscriber-side device is based on either the peak required bandwidth value or the average required bandwidth value for the service, for each virtual passive network. It is characterized by comprising a resource allocation means for determining the allocated band of each subscriber-side device and determining the wavelength for accommodating each subscriber-side device.
The second resource allocation device of the present invention constructs a virtual passive network for each service, allocates a band according to the required band for each service of each subscriber side device that accommodates the service, and outputs optical signals having different wavelengths. Multiple optical line termination means to terminate, traffic monitoring means to monitor the traffic status of each virtual passive network of each subscriber side device receiving each service, and average required bandwidth value for each service of each subscriber side device. And, based on the comparison result with the value indicating the traffic amount used by each subscriber side device for each service, the band value of the virtual passive network of each subscriber side device is determined, and each subscriber side device is determined. It is characterized by comprising a resource allocation means for determining a wavelength for accommodating the light.

The third resource allocation program of the present invention constructs a virtual passive network for each service of the computer, allocates a band according to the required band for each service of each subscriber side device that accommodates the computer, and allocates a band according to the required band for each service, and each has a different wavelength. Supports multiple optical line termination means for terminating optical signals, traffic monitoring means for monitoring the traffic status of each virtual passive network of each subscriber side device that receives each service, and each service of each subscriber side device. Depending on the traffic situation of each virtual passive network, each subscriber side device for each virtual passive network based on either the peak required bandwidth value or the average required bandwidth value for the service. It is characterized in that it functions as a resource allocation means for determining the allocated band of the device and determining the wavelength for accommodating each subscriber side device.
The fourth resource allocation program of the present invention constructs a virtual passive network for each service of the computer, allocates a band according to the required band for each service of each subscriber side device that accommodates the computer, and allocates a band according to the required band for each service, and each has a different wavelength. Multiple optical line termination means for terminating optical signals, traffic monitoring means for monitoring the traffic status of each virtual passive network of each subscriber side device receiving each service, and average for each service of each subscriber side device. Based on the comparison result between the required bandwidth value and the value indicating the traffic amount used by each subscriber side device for each service, the band value of the virtual passive network of each subscriber side device is determined, and each subscription is performed. It is characterized in that it functions as a resource allocation means for determining a wavelength for accommodating a computer-side device.

In the fifth resource allocation method of the present invention, each of the plurality of optical line termination means constructs a virtual passive network for each service and accommodates the bandwidth according to the required bandwidth for each service of each subscriber-side device. The traffic monitoring means monitors the traffic status of each virtual passive network of each subscriber side device that receives each service, and the resource allocation means is on each subscriber side. Depending on the traffic status of each virtual passive network corresponding to each service of the device, each subscriber device has a virtual passive network based on either the peak required bandwidth value or the average required bandwidth value for the service. It is characterized in that the allocated band of each subscriber side device is determined for each, and the wavelength for accommodating each subscriber side device is determined.
In the sixth resource allocation method of the present invention, each of the plurality of optical line termination means constructs a virtual passive network for each service, and bandwidths according to the required bandwidth for each service of each subscriber-side device that accommodates the service. The traffic monitoring means monitors the traffic status of each virtual passive network of each subscriber side device that receives each service, and the resource allocation means is on each subscriber side. Bandwidth value of the virtual passive network of each subscriber side device based on the comparison result between the average required bandwidth value for each service of the device and the value indicating the traffic amount used by each subscriber side device for each service. Is determined, and the wavelength for accommodating each subscriber-side device is determined.

The seventh station-side device of the present invention constructs a virtual passive network for each service, allocates a band according to the required band for each service of each subscriber-side device to be accommodated, and outputs optical signals having different wavelengths. Multiple optical line termination means to terminate, traffic monitoring means to monitor the traffic status of each virtual passive network of each subscriber side device receiving each service, and each virtual corresponding to each service of each subscriber side device. Each subscriber-side device allocates each subscriber-side device for each virtual passive network based on either the peak demand bandwidth value or the average demand bandwidth value for the service, depending on the traffic situation of the passive network. It is characterized by including a resource allocation means for determining a band and determining a wavelength for accommodating each subscriber-side device.
The eighth station-side device of the present invention constructs a virtual passive network for each service, allocates a band according to the required band for each service of each subscriber-side device to be accommodated, and outputs optical signals having different wavelengths. Multiple optical line termination means to terminate, traffic monitoring means to monitor the traffic status of each virtual passive network of each subscriber side device receiving each service, and average required bandwidth value for each service of each subscriber side device. And, based on the comparison result with the value indicating the traffic amount used by each subscriber side device for each service, the band value of the virtual passive network of each subscriber side device is determined, and each subscriber side device is determined. It is characterized by comprising a resource allocation means for determining a wavelength for accommodating the light.

Average required bandwidth value (average bandwidth value) is within a predetermined time period, ONU 40 receiving the service in virtual PON is refers to the average value of the required bandwidth values required to receive provision of the service.

Claims (10)

With a plurality of optical line termination means for constructing a virtual passive network for each service, allocating a band according to the required band for each service of each of the subscriber-side devices to be accommodated, and terminating optical signals having different wavelengths. ,
A traffic monitoring means for monitoring the traffic status of each virtual passive network of each of the subscriber-side devices receiving each of the above services, and a traffic monitoring means for monitoring the traffic status of each of the above virtual passive networks.
Based on the required bandwidth for each service of each of the subscriber-side devices and the traffic status of each of the virtual passive networks of each of the subscriber-side devices receiving the services, each of the above virtual A resource allocation device comprising: a resource allocation means for determining an allocated band of each of the subscriber-side devices of a passive network and determining a wavelength for accommodating each of the subscriber-side devices. The resource allocation means so that each of the subscriber-side devices satisfies the required bandwidth value for the service based on the traffic status of each of the virtual passive networks corresponding to the services of each of the subscriber-side devices. The resource allocation device according to claim 1, wherein the allocated bandwidth of each of the subscriber-side devices for each virtual passive network is determined. The resource allocation means makes a peak request bandwidth value or an average request for the service according to the traffic status of each virtual passive network corresponding to each service of each subscriber side device. The resource allocation device according to claim 1 or 2, wherein any of the band values determines the allocated bandwidth of each of the subscriber-side devices for each virtual passive network. The resource allocation means is based on the comparison result between the average required bandwidth value of each of the subscriber-side devices for each of the services and the value indicating the traffic amount used by each of the subscriber-side devices for each of the services. The resource allocation device according to any one of claims 1 to 3, wherein the bandwidth value of the virtual passive network of each subscriber-side device is determined. According to claim 4, when the value indicating the traffic amount is equal to or less than the average required bandwidth value, the average required bandwidth value is set as the bandwidth value of the virtual passive network of each of the subscriber-side devices. The resource allocation device described. When the value indicating the traffic amount is larger than the average bandwidth value, the resource allocation means is the first average value of the peak demand bandwidth value and the average demand bandwidth value for each service of each subscriber side device. The resource allocation according to claim 4, wherein the bandwidth value of the virtual passive network of each of the subscriber-side devices is determined based on the result of comparison between the bandwidth value and the value indicating the traffic amount. Device. When the first band value is larger than the value indicating the traffic amount, the peak required band value is set as the band value of the virtual passive network of each subscriber side device, and the first band value is the traffic amount. The resource allocation device according to claim 6, wherein the average required bandwidth value is set as the bandwidth value of the virtual passive network of each of the subscriber-side devices when the value is equal to or less than the value indicating. Computer,
With a plurality of optical line termination means for constructing a virtual passive network for each service, allocating a band according to the required band for each service of each of the subscriber-side devices to be accommodated, and terminating optical signals having different wavelengths. ,
A traffic monitoring means for monitoring the traffic status of each virtual passive network of each of the subscriber-side devices receiving each of the above services, and a traffic monitoring means for monitoring the traffic status of each of the above virtual passive networks.
Based on the required bandwidth for each service of each of the subscriber-side devices and the traffic status of each of the virtual passive networks of each of the subscriber-side devices receiving the services, each of the above virtual A resource allocation program characterized in that it determines the allocated bandwidth of each of the subscriber-side devices of a passive network and functions as a resource allocation means for determining a wavelength for accommodating each of the subscriber-side devices. Each of the plurality of optical line termination means constructs a virtual passive network for each service, allocates a band according to the required band for each service of each of the subscriber-side devices to be accommodated, and optical signals having different wavelengths. Terminate and
The traffic monitoring means monitors the traffic status of each virtual passive network of each of the subscriber-side devices receiving each of the above services.
The resource allocation means is based on the required bandwidth for each service of each of the subscriber-side devices and the traffic status of each of the virtual passive networks of each of the subscriber-side devices receiving the services. A resource allocation method characterized in that the allocated band of each of the subscriber-side devices of each of the virtual passive networks is determined, and the wavelength for accommodating each of the subscriber-side devices is determined. With a plurality of optical line termination means for constructing a virtual passive network for each service, allocating a band according to the required band for each service of each of the subscriber-side devices to be accommodated, and terminating optical signals having different wavelengths. ,
A traffic monitoring means for monitoring the traffic status of each virtual passive network of each of the subscriber-side devices receiving each of the above services, and a traffic monitoring means for monitoring the traffic status of each of the above virtual passive networks.
Based on the required bandwidth for each service of each of the subscriber-side devices and the traffic status of each of the virtual passive networks of each of the subscriber-side devices receiving the services, each of the above virtual A station-side device comprising: a resource allocation means for determining an allocated band of each of the subscriber-side devices of a passive network and determining a wavelength for accommodating each of the subscriber-side devices.

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