JP6865700B2 - Communication systems, control systems, and optical communication network systems - Google Patents

Description

The present invention relates to communication systems, control systems, and optical communication network systems, and can be applied to, for example, the infrastructure of mobile communication networks.

In recent years, various infrastructures used for mobile communication network networks are being replaced with those constructed by using network virtualization technology such as NFV (Network Virtualization).

In Patent Document 1, an operation method when the infrastructure of a mobile communication network (each node or transmission path on the network) is constructed by a virtual link or a virtual node (VNF = Virtualized Network Function) using network virtualization technology. Is described. Specifically, in the system described in Patent Document 1, the infrastructure (resource) of the mobile communication network and the virtual node VNF are 3 of VNFM (VNF Manager), VIM (Virtual Infrastructure Manager) and Orchestrator. It is managed by one element. The VNFM sets a VNF on a virtual machine (a virtual machine set on the physical infrastructure by the VIM), and manages (controls) each VNF via the VIM for the set VNF. VIM abstracts the physical infrastructure under the control of VNFM or the orchestrator, and creates and deletes virtual machines on it.

Specifically, the sequence diagrams shown in FIGS. 15 and 16 of Patent Document 1 describe an example of a method of virtually managing the infrastructure on the network of the mobile communication network by VNF. First, in the sequence diagram of Patent Document 1, the orchestrator periodically inquires of VIM for resource information and acquires the resource information (see steps S001 and S002 of FIG. 15 of Patent Document 1). .. Next, the OSS (Operation & Service System) requests the orchestrator to provide a service for providing a virtual network (see step S003 in FIG. 15). After that, the orchestrator selects the VNMF required to provide the service, and inquires the VNFM to return the resources required to construct and set the VNF (virtual network function) (Patent Document 1). See step S006 in FIG. 15). Then, the VNFM that received the inquiry inquires the VIM about the resource usage status (see steps S007 and S008 in FIG. 15 of Patent Document 1), and returns the resource information for which the VNF is to be constructed and set to the orchestra (FIG. 1 of Patent Document 1). See step S011 in step 15). After that, the orchestrator makes a resource reservation to VIM (see step S013 in FIG. 15 of Patent Document 1). After that, a request for generation (construction / setting) of VNF is issued to VNFM (see step S017 in FIG. 15 of Patent Document 1), and the VNFM receiving the request instructs VIM to make VNF (Patent Document 1). See step S019 in FIG. 15). If VNF can be generated by VIM, it is notified to the orchestrator via VNFM (see steps S021 and S023 in FIG. 16 of Patent Document 1). In Patent Document 1, the infrastructure on the network of the mobile communication network is virtually managed by VNF by the above processing.

Normally, the virtual network function is composed of virtual nodes, virtual links, etc., and a virtual network is constructed by combining these with a management function.

Next, there is a slice architecture technique described in Non-Patent Document 2 as a slice architecture technique for constructing a plurality of virtual networks in which virtual nodes are combined on the same physical resource group.

Non-Patent Document 2 describes the slice architecture under consideration in ITU-T (see FIG. 2 of Non-Patent Document 2). In Non-Patent Document 2, a plurality of virtual networks are constructed as slices, and each network slice has a different administrator, and the administrator of each slice makes the virtual network as if it actually owns the network. Shows how to make it operational. The following are the differences (differences) between the virtual network called slice and the conventional technology.
[First difference] The slice administrator can freely build, monitor, modify, and delete multiple virtual network functions (node parts) that he / she desires by using authorized resources.
[Second difference] The slice administrator can freely build, monitor, modify, and delete multiple virtual network functions (links) that he or she desires, using authorized resources.
[Third difference] The administrator can freely build a virtual network by using the above virtual network function (node part + link part).

International Publication WO2015 / 099035

Goto “ITU-T FG-IMT2020 Activity Report”, NTT Technical Journal, 2017.4 p62 ResearchGate GmbH, "Handover Reduction in Virtualization Cloud Radio Access Network", [Online], [Online], [Online], INTERNET, [January 20, 2018], [Online], INTERNET, [January 20, 2018] 310952820_Handover_Reduction_in_Virtualized_Cloud_Radio_Access_Networks_Using_TWDM-PON_Fronthaul> Keita Nishimoto, Masashi Tadokoro, Takeaki Mochida, Akiyuki Takeda, Toshikiyo Tanaka and Takashi Inoue, "Virtualization of EPON OLT functions and collision suppression techniques for Multi-Point MAC Control", [Online], INTERNET, [1 May 20, 2018 Search ], <URL: http://ieeexplore.ieee.org/document/7537775/metrics?part=1>

In the description technique of Patent Document 1, it is shown that VNFM uses VNI to inquire about resource information and select a resource (infrastructure) suitable for installing VNF (step S007 in FIG. 15 of Patent Document 1). , S008), as a specific example, when VNFM wants to use PON (Passive Optical Network) as a resource (infrastructure) for installing VNF, a specific method for constructing VNF (virtual node) on PON is shown. It has not been. Conventionally, as a PON control means related to this, there are the techniques described in Non-Patent Documents 2 and 3.

However, with respect to the conventional PON control means (the techniques described in Non-Patent Documents 2 and 3), it is difficult to construct a VNF as described in Patent Document 1 and construct a slice using the VNF. .. Specifically, when applying the conventional PON control means (the techniques described in Non-Patent Documents 2 and 3) to the slice architecture technique as described in Patent Document 1, the following problems exist. To do.
[First problem] There is no means for dynamically constructing a virtual PON using a physical PON.
[Second problem] When the policies of a plurality of virtual PONs to be constructed are different, it is not possible to construct virtual PONs having different policies on one physical PON.
[Third Problem] There is no suitable resource allocation means for a virtual PON when the physical PON uses a plurality of wavelengths and it takes time to change the wavelength.
[Fourth Problem] A method of providing a plurality of virtual PONs for power saving is not provided.

In view of the above problems, communication systems, control systems, and optical communication network systems that can configure one or more virtual PONs on a physical PON and provide a highly convenient operating environment for virtual PONs are available. It is desired.

The first communication system of the present invention comprises (1) one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device. An optical communication network system to be provided, and (2) a virtual slave station communication device is set in each of the slave station communication devices, a virtual master station communication device is set in the master station communication device, and a plurality of the virtual slave station communication devices are set. And, control is performed for each virtual optical communication network system in which the virtual master station communication device is combined, and a separate communication band of the optical transmission line is set for each virtual optical communication network system. It has a virtual optical communication network system control means, and (3) the virtual optical communication network system control means sets a shared communication band shared by a plurality of the virtual slave station communication devices in the optical communication network system. The virtual optical communication network system of 1 and the second virtual optical communication network system in which a separate unique communication band is set for each slave station communication device can be set at the same time, and (4) the optical transmission path. The optical signal is transmitted by the TDMA method, and (5) the virtual optical communication network system control means sets a communication band of continuous time slots at the same wavelength with respect to the first virtual optical communication network system. Priority is given to allocation , and (6) the virtual optical communication network system control means is used as much as possible for the virtual optical communication network system in which a shared communication band shared by the plurality of virtual slave station communication devices is set. For the first band setting policy of allocating the communication band of continuous time slots within one wavelength and the virtual optical communication network system in which a separate unique communication band is set for each slave station communication device. Within the scope of the second band setting policy that the communication band spanning a plurality of wavelengths may be set, the first band setting policy, and the second band setting policy, each virtual Allocate the communication band of the optical transmission line to each of the virtual optical communication network systems in accordance with the third band setting policy of allocating a band that leaves a free communication band of continuous time slots to the optical communication network system. It is characterized by that.

The second control system of the present invention includes an optical communication device including one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device. It controls the network system, and sets a virtual slave station communication device in each of the slave station communication devices, sets a virtual master station communication device in the master station communication device, and sets a plurality of the virtual slave station communication devices. It controls each virtual optical communication network system, which is a slice combining the device and one virtual master station communication device, and is a customer terminal separately defined for each virtual optical communication network system. It is characterized by having a virtual optical communication network system control means for setting a separate communication band of the optical transmission line based on management.

The third optical communication network system of the present invention includes one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device. The optical communication network system is characterized in that it operates in response to the control of the second control system of the present invention.

According to the present invention, one or a plurality of virtual PONs can be configured on a physical PON to provide a highly convenient operating environment for virtual PONs.

It is a block diagram which showed the example of the whole structure of the communication system which concerns on embodiment. It is a block diagram which showed the functional structure of the VIM which concerns on embodiment. It is a block diagram which showed the functional structure of VNFM which concerns on embodiment. It is a block diagram which showed the structure of the virtual mobile communication system (slice data plane and control brain) which concerns on embodiment. It is explanatory drawing which showed the method of virtualizing the physical PON and the antenna device group which concerns on embodiment. It is explanatory drawing which showed the structural example of the OLT setting data which concerns on embodiment. It is explanatory drawing which showed the structural example of the ONU setting data which concerns on embodiment. It is explanatory drawing which showed the structural example of the vPON configuration data which concerns on embodiment. It is explanatory drawing which showed the example (the 1) of the band allocation data (the band allocation method) which concerns on embodiment. It is explanatory drawing which showed the example (the 2) of the band allocation data (the band allocation method) which concerns on embodiment.

(A) Main Embodiments Hereinafter, one embodiment of the communication system, the control system, and the optical communication network system according to the present invention will be described in detail with reference to the drawings. Hereinafter, an example in which the communication system of the present invention is applied to a virtual PON providing system will be described. Further, an example in which the optical communication network system of the present invention is applied to a physical PON will be described below. Further, an example in which the control system of the present invention is applied to a system having a VNFM and VIM configuration described later will be described below.

(A-1) Configuration of Embodiment FIG. 1 is a block diagram showing an overall configuration of a network system 1 according to this embodiment.

In the network system 1, a system in which a mobile network system 100 is sliced (logically divided) by a slice architecture (hereinafter, also referred to as a “virtual mobile communication system”) is referred to as a plurality of Network SlicesCustomers (hereinafter, simply referred to as “customers”). ) Is a system provided to.

The customer is, for example, a business operator that provides a mobile communication network to an end user (terminal ET possessed by the end user) by receiving the provision of a virtual mobile communication system. That is, the customer is a function or person (organization) that requests, receives, and manages slices from a communication carrier having its own equipment, such as an MVNO (Mobile Virtual Network Operator) operator, and uses a terminal ET. As mentioned above, it is the end user (customer of the customer). Each terminal ET connects to the mobile network system 100, but uses only the virtual mobile communication system of the customer who subscribes.

In the example of this embodiment, the network system 1 is a mobile communication network system in which a terminal ET as a wireless communication terminal (mobile communication terminal) is connected to the core network N2. As the terminal ET, various wireless communication terminals (for example, terminals such as smart phones and mobile routers) can be applied.

In the network system 1, for example, the mobile network system 100 as a Network Slice Blueprint will be described as being sliced by the same slice architecture as in Non-Patent Document 1. In the network system 1, LCM & O2 (IMT2020 Sense Lifecycle Management & Orchestration), which plays an orchestrator function in the slice architecture, is arranged. Further, in FIG. 1, customer terminals CT-1 and 2000-2 are arranged as terminals used by two customers. The LCM & O2 controls slicing the mobile network system 100 in response to a request from the customer terminals CT-1 and CT-2, and provides each customer with a sliced virtual mobile communication system.

Next, an outline of each element (resource) of the mobile network system 100 will be described.

As shown in FIG. 1, the mobile network system 100 includes an antenna device group 8, a physical PON 6, a base station device 7, a metro network N1, a mobility management device 9, and a core network N2.

The antenna device group 8 is an element including a plurality of antenna devices 50 (15 in FIG. 1) that wirelessly connect the terminal ET used by the end user. The base station device 7 is a device that controls each antenna device 50 of the antenna device group 8. The physical PON 6 is an optical communication network system (access network) that makes a PON connection (1: N connection) between the base station device 7 and each antenna device 50. The mobility management device 9 is a device that controls the terminal ET via the base station device 7 and the antenna device 50 and relay-connects the terminal ET to the core network N2. The metro network N1 is a network that relays between the base station device 7 and the mobility management device 9. In the mobile network system 100, the terminal ET can communicate with the core network N2 by the above configuration.

Next, a configuration in which the mobile network system 100 is sliced in the network system 1 and provided to each customer will be described.

As described above, in the network system 1, the VNF that virtualizes each element of the mobile network system 100 is incorporated into a slice (Network Slice Instruction) centering on the LCM & O2 that functions as an orchestrator, and is provided to each customer.

In this specification, a configuration in which a physical PON 6 directly related to the present invention is virtualized to be formed as a VNF and incorporated into a slice will be described. The means for virtualizing elements other than the physical PON6 to obtain VNF is not limited, and various virtualization means can be applied. Hereinafter, the VNF formed by virtualizing from the physical PON 6 will also be referred to as “vPON”.

As described above, in the network system 1, the mobile network system 100 is sliced by the same slice architecture as in Non-Patent Document 1. In the slice architecture shown in Non-Patent Document 1, each slice is a slice management function (Slice Instance), a resource (Resource), a data plane (D-Plane), a control plane (C-Plane), and an application. It is composed of five functions. To each customer who uses each slice, it seems as if each function (each function constituting the slice) exists. In addition, since the application is not an indispensable element in the slice, there are some that do not have the function of the application. In this embodiment, of the functions constituting the slice, the resources in each slice are provided by the VIM setting each infrastructure in the mobile network system 100.

In FIG. 1, VNFM4 and VIM5 are arranged as elements for configuring and controlling vPON (VNF) by virtualizing physical PON6. That is, in FIG. 1, a virtual PON providing system 3 that provides vPON is configured by VNFM4, VIM5, and physical PON6. Further, the control system of the present invention corresponds to a system composed of VNFM4 and VIM5 (system for controlling physical PON6).

The vPON provided by the virtual PON providing system 3 corresponds to a part of the VNF used for the data plane and the control plane existing in the slice provided to each customer. The vPON as a VNF is configured by the VIM5 and the VNFM4 using the above-mentioned resource (physical PON6), and is incorporated into each customer's slice (virtual mobile communication system).

Again, the slices provided to the customer are constructed by LCM & O2 by combining the resources, data planes and control planes provided by VIM5 and VNFM4 with services and slice management functions. The vPON provided by the virtual PON providing system 3 corresponds to a part of the data plane and the control plane among these elements. That is, in the network system 1, a "virtual mobile communication system" configured by virtualizing (VNFing) the mobile network system 100 including the virtual PON providing system 3 is provided to each customer for each slice. It will correspond to a part of the data plane and the control plane.

Note that FIG. 1 shows in detail only the virtual PON providing system 3 that provides vPON as an element constituting the data plane and the control plane. In the network system 1, other elements (antenna device group 8, base station device 7, metro network N1, mobility management device 9, and core network N2) also correspond to VIM (not shown) and VNFM (not shown). ) Is placed. Then, in the network system 1, each of the other elements (antenna device group 8, base station device 7, metro network N1, mobility management device 9, and core network N2) is also virtualized (VNF) and sliced (sliced). It will be incorporated into the data plane and control plane that make up the above.

FIG. 4 is a block diagram showing a configuration of a virtual mobile network system 1000 (1000-1, 1000-2) as a data plane and a control plane provided to two customer slices in the network system 1.

FIG. 4A illustrates the virtual mobile network system 1000-1 provided for the first customer slice. Also, FIG. 4B illustrates the virtual mobile network system 1000-2 provided for the second customer slice.

As shown in FIG. 4, the virtual mobile network system 1000 (1000-1, 1000-2) has an antenna device group 8, a physical PON 6, a base station device 7, a metro network N1, a mobility management device 9, and a core, respectively. Virtual antenna device group 800 (800-1, 800-2), vPON600 (600-1, 600-2), virtual base station device 700 (700-1, 700-2) virtualized (VNF) from network N2 ), Virtual metro network N100 (N100-1, N100-2), virtual mobility management device 900 (900-1, 900-2), and virtual core network N200 (N200-1, N200-2). .. Details of each element of the virtual mobile network system 1000 (1000-1, 1000-2) will be described later.

Next, the physical configuration of the section from the base station device 7 to the antenna device group 8 constituting the mobile network system 100 will be described.

As shown in FIG. 1, the mobile network system 100 includes a base station device 7 arranged in a station building of a communication carrier and a plurality of antenna devices 50 connected under the base station device 7. ing. In FIG. 1, it is assumed that 15 antenna devices 50 (50-1 to 50-15) are connected under the base station device 7. Further, in the following, the antenna devices 50-1 to 50-15 connected under the base station device 7 will be collectively referred to as an antenna device group 8. In the network system 1, each antenna device 50 constitutes one cell (cell for wireless communication), and is connected to the terminal ET in the cell according to the control of the base station device 7.

In the example shown in FIG. 1, in the mobile network system 100, the wired section between each base station device 7 and each antenna device 50 is composed of an OLT 10 as a master station communication device and an ONU 20 as a slave station communication device. It is connected by the physical PON6 (optical communication network system).

Specifically, in the example shown in FIG. 1, the OLT 10 is connected to the lower side of the base station apparatus 7. Further, ONUs 20-1 to 20-15 are connected to the upper side of the antenna devices 50-1 to 50-15, respectively. Furthermore, the lower side of the OLT 10 is an optical fiber 40 as an optical transmission line branched (1: N-branched) by the splitter 30 and is connected to the ONUs 20-1 to 20-15.

The interface of the OLT 10 and the ONU 20 (the interface of the PON section) is not limited, but for example, ITU-T G.I. A TWDM-PON (Time and Wavelength Division Multiplexing-PON) interface compatible with the 989 series can be applied. In this embodiment, TWDM-PON will be described as an interface of the OLT 10 and the ONU 20 constituting the PON 2.

The splitter 30 branches the optical fiber 40 on the lower side (ONU20 side) (several branches of the ONU20) and connects it to the optical fiber 40 on the upper side (OLT10 side).

Next, the internal configuration of the OLT 10 will be described.

In the OLT 10, it is assumed that communication of 10 Gbps at one wavelength (1λ) is possible in both downlink communication (communication from OLT 10 to ONU 20) and uplink communication. Further, in the OLT 10, it is assumed that communication using three wavelengths (hereinafter, these three wavelengths are referred to as λ1 to λ3) is possible in both downlink communication and uplink communication. Therefore, it is assumed that the OLT 10 enables a total of 30 Gbps (10 Gbps x 3) communication for both downlink communication and uplink communication.

Next, the internal configuration of each OLT 10 will be described.

The OLT 10 has a transport unit 11 that connects to a PON (optical fiber 40) and relays (transports) communication with a higher-level side (base station device 7), and a control unit 12 that controls the entire device. There is.

The transport unit 11 is an optical filter 111 (optical transceiver) capable of processing a plurality of variable wavelength light (optical signals of each wavelength of λ1 to λ3), and three termination devices (termination devices for terminating PON for one wavelength). ) As an OLTC 112 (112-1 to 112-3), and a switch 113.

The control unit 12 has an OLTC control unit 121 that controls the transport unit 11.

The transport unit 11 controls each OLTC 112 and each ONU 20 via each OLTC 112 according to the instruction of the OLTC control unit 121. For example, the OLTC control unit 121 performs a process of assigning any wavelength (any of λ1 to λ3) to the OLTC112-1 to 112-3.

The optical filter 111 branches the optical fiber 40 branched on the lower side (splitter 30 side) on the upper side and connects it to the OLTC 112-1 to 112-3. The optical filter 111 mixes optical signals of each wavelength (optical signals of each wavelength of λ1 to λ3) supplied from OLTC 112-1 to 112-3 on the upper side and sends them to the lower side (splitter 30 side). ..

Further, the optical filter 111 extracts an optical signal of each wavelength from an optical signal (an optical signal in which wavelengths of λ1 to λ3 are mixed) supplied from the lower side, and corresponds the optical signal of each wavelength to the OLTC112-. Supply to 1-112-3.

The OLTCs 112-1 to 112-3 use optical signals having different wavelengths to communicate with the subordinate ONU50 and control the subordinate ONU20 (PON control). In this embodiment, the OLTCs 112-1 to 112-3 will be described as performing optical communication at wavelengths of λ1 to λ3, respectively. Further, each OLTC 112-1 to 112-3 is connected to the switch 113 on the upper side.

The OLTCs 112-1 to 112-3 communicate with the lower side (PON) at different wavelengths (wavelengths corresponding to the control of the OLTC control unit 121), and control the ONU 20 communicating at the same wavelength. Further, each of the OLTCs 112-1 to 112-3 transfers (transmits) the uplink communication data (packet) received from the lower side to the upper side via the switch 113, and receives the downlink communication data (packet) from the upper side via the switch 113. Communication data (packet) is transmitted to the lower side (to the subordinate ONU20).

The switch 113 is a switch that relays the transmission / reception of packets (Ethernet (registered trademark) frames) between the OLTC 112-1 to 112-3 and the upper side (base station device 7 side). It is assumed that the switch 113 is connected to the base station apparatus 7 by an Ethernet interface (Ethernet cable).

Next, the outline of the base station apparatus 7 will be described.

The base station device 7 determines the allocation of resources (for example, frequency, time slot, etc.) for wireless communication for each antenna device 50, and controls each antenna device 50 so as to operate according to the determined contents. Further, the base station device 7 connects to each antenna device 50 via the physical PON 6 (OLT10 and ONU20), and performs a communication process for relaying communication between each antenna device 50 and the metro network N1.

Next, a method for forming the virtual antenna device group 800 from the antenna device group 8 will be described.

FIG. 5 is an explanatory diagram showing a method of virtualizing the physical PON 6 and the antenna device group 8.

Each antenna device 50 constituting the antenna device group 8 can communicate using a plurality of communication channels by various multiple access methods. The multiple access method applied to each antenna device 50 is not limited, and for example, TDMA (Time Division Multiple Access), FDMA (Frequency-Division Multiple Access), FTDMA (Frequency Multiple Access), etc. Can be done.

In the antenna device group 8, the antenna device 50 is virtualized by setting a different communication channel (for example, a communication channel composed of time division and / or frequency division) for each customer of the slice (for each virtual antenna device group 800). Can be realized.

As shown in FIG. 5, in the antenna devices 50-1 to 50-15, the communication channel Ch1 is set for the virtual antenna device group 800-1 of the first customer, and the virtual antenna device group 800- of the second customer. The communication channel Ch2 can be set for 1. This makes it possible to logically form two virtual antenna devices 500 from each antenna device 50. In this embodiment, for the sake of simplicity, one type of communication channel is set in one virtual antenna device group 800, but a plurality of types of communication channels are applied in the same virtual antenna device group 800. You may do so.

As shown in FIG. 4A, the virtual antenna device group 800-1 has a virtual antenna device 500-101 to 500-110 composed of antenna devices 50-1 to 50-10. Further, as shown in FIG. 4B, the virtual antenna device group 800-2 is composed of virtual antenna devices 500-201 to 500-215 configured by antenna devices 50-1 to 50-15.

Next, a method of setting a plurality of vPON600s in the physical PON6 will be described with reference to FIGS. 4, 5, and the like.

In the following, a configuration in which two vPON600s (600-1, 600-2) as shown in FIGS. 4 and 5 are set by LCM & O2, VNFM4, and VIM5 will be described. The operation of the LCM & O2, the VNFM4, and the VIM5 to set a new vPON600 in response to the request of the customer (customer terminals CT-1, CT-2) will be described later.

Normally, in the transmission / reception of a frame between an ONU and an OLT in a PON, an identifier that identifies a logical path such as an LLID (Logical Link. ID) is used to identify a destination or a source. Therefore, in this embodiment, as shown in FIG. 5, in the physical PON6, the traffic of each vPON600 is distinguished by assigning a different LLID (Logical Link ID) to each ONU20 for each vPON600. ..

In the following, vPON600-1 and 600-2 will also be referred to as "vPON1" and "vPON2", respectively.

In the physical PON6 of this embodiment, as shown in FIG. 5, X101 to X110 are assigned as LLIDs for vPON1 to ONU20-1 to 20-10, respectively. Further, in the physical PON6 of this embodiment, as shown in FIG. 5, X201 to X215 are assigned to ONU20-1 to 20-15 as LLIDs for vPON2, respectively.

Further, in each ONU 20, it is possible to set a virtual NIC 21 (virtual Ethernet port) corresponding to each LLID in communication with the lower side (antenna device 50). Then, a different MAC address is set for each virtual NIC 21 of each ONU 20.

As shown in FIG. 5, a corresponding LLID is set for each vPON 600 in each ONU 20. Therefore, for ONU20-1 to 20-10, a virtual NIC 21 is set for each of the two LLIDs, and for ONU20-10 to 20-15, a virtual NIC is set for each of the two LLIDs.

Specifically, in the physical PON6 of this embodiment, as shown in FIG. 5, ONU20-1 is a virtual NIC21-101 (corresponding to LLID: X101) for vPON1 and a virtual NIC21-201 (LLID: X201) for vPON2. ONU20-2 has a virtual NIC21-102 (corresponding to LLID: X102) for vPON1 and a virtual NIC21-202 (corresponding to LLID: X202) for vPON2. 10 has a virtual NIC21-210 (corresponding to LLID: X210) for vPON2, ..., ONU20-15 has a virtual NIC21-215 (corresponding to LLID: X215) for vPON2. Further, in the physical PON6 of this embodiment, as shown in FIG. 5, the MAC addresses corresponding to the LLIDs "X101" to "X110" and "X201" to "X215" are set to "A101" to "A110" and "A110", respectively. It is referred to as "A201" to "A215".

Further, in the OLT 10, it is possible to set different virtual NICs (virtual Ethernet ports) for each vPON600 in the connection with the upper side (metro network N1) (connection by the switch 113). .. That is, in the OLT 10 (switch 113), it is possible to control and identify the packet on the upper side for each vPON 600 by communicating with the upper side using a virtual NIC different for each vPON 600.

In the OLT 10 of this embodiment, as shown in FIG. 5, "A01" is set as the MAC address of the virtual NIC101-1 for vPON1, and "A02" is set as the MAC address of the virtual NIC101-2 for vPON2. There is.

In this embodiment, each ONU 20 and the antenna device 50 are connected by a cable 501 (for example, a cable such as an Ethernet cable or a serial cable), and each virtual NIC 21 of each ONU 20 is connected by the antenna device 50. It is assumed that communication linked with the corresponding communication channel of vPON600 is possible.

As a result, for example, in the antenna device 50-1, the communication of the communication channel Ch1 for vPON1 is communicated via the MAC address A101 (virtual NIC21-101) set on ONU20-1, and the communication for vPON2 is performed. Regarding the communication of channel Ch2, vPON1 (communication channel Ch1) and vPON2 (communication channel 2) communicate with each other via the MAC address A201 (virtual NIC21-201) for vPON2 set on ONU20-2. Communication using different LLIDs (logical paths) can be performed. The same applies to other ONU 20s. Similarly, in the OLT10, the communication for vPON1 is communicated via the MAC address A01 (virtual NIC101-1) set on the OLT10, and the communication for vPON2 is the MAC set on the OLT10. By communicating via the address A02 (virtual NIC101-2), it is possible to perform communication using different LLIDs (logical paths) between vPON1 and vPON2.

As described above, in the physical PON6, a different LLID (MAC address) is used for each communication channel (for each virtual antenna device group 800) corresponding to each antenna device 50 (virtual antenna device 500), and a PON section (each ONU20) is used. By communicating (between and OLT10), it is possible to carry out distinct communication for each vPON600. As a result, as shown in FIG. 4, vPON1 and vPON2 can be formed on the physical PON6 (OLT10 and ONU20-1 to 20-15).

As shown in FIG. 4A, the vPON1 has a vOLT100-1 and 10 vONU200-101 to 200-110, and a virtual branch between the vOLT100-1 and each vONU200 at a ratio of 1:10. It is configured to be connected by a transmission line 400-1. Further, as shown in FIG. 4B, vPON2 has vOLT100-2 and 15 vONU200-201 to 200-215, and a virtual transmission line branched between vOLT100-2 and each vONU200. It is configured to be connected by 400-2.

Next, a method of band control for the virtual transmission lines 400-1 and 400-2 in each vPON 600 will be described.

As described above, in the physical PON6, different LLIDs (MAC addresses) are used for each communication channel (for each virtual antenna device group 800) corresponding to each antenna device 50 (virtual antenna device 500), and the PON section (each ONU20) is used. By communicating with the OLT 10), it is possible to distinguish the communication for each vPON600. For example, in the physical PON6, by performing bandwidth control for each LLID in the PON section, the total amount of bands used in each vPON600 is indirectly controlled (the total amount of bands used in all LLIDs belonging to each vPON600). It is also possible to do. It is assumed that the physical PON 6 is set to a vPON 600 having N vONU 200s. In this case, in the physical PON6, a band control function for each N LLIDs (vONU200) is set as the first-stage band control, and N LLIDs (vONU200) are bundled as the second-stage band control. The band control function may be set. That is, in the physical PON 6, N + 1 band control functions may be used to control the band of the vPON 600 having N vONU 200s. To such a bandwidth allocation control function, the bandwidth allocation control function in various PONs can be applied.

Further, in a PON corresponding to normal Ethernet, it is possible to set a VLAN (Virtual LAN; for example, a tag VLAN) in a PON section (between a virtual NIC on an ONU and a virtual NIC on an OLT), and the VLAN can be set. It is possible to set the maximum usable band for each trunk (transmission path).

Therefore, in the physical PON6, different VLAN-IDs are set for each virtual NIC (virtual NIC21 of each ONU20 and virtual NIC101 of OLT10) for each vPON600 unit or vONU200 unit, and the maximum usable bandwidth is set for each VLAN. Therefore, it is possible to control the band for each vPON600.

Here, vPON1 is a type in which each vONU200 shares a band (hereinafter, referred to as "bandwidth sharing type"), and vPON2 is a type in which each vONU200 sets a unique band (hereinafter, referred to as "bandwidth-specific type"). ).

In this case, in vPON1, for example, a VLAN-ID "1" common to each virtual NIC21-101 to 21-110 corresponding to each vONU200-101 to 200-110 and the virtual NIC101-1 on the OLT10 side is set. By allocating the bandwidth shared by one VLAN, a bandwidth sharing type configuration can be realized.

Further, in vPON2, for example, different VLAN-IDs "2" to "16" are set in the 15 virtual NICs 21-201 to 21-215 corresponding to each vONU200-201 to 200-115, and further, the OLT10 side. All 15 VLAN-IDs (all VLAN-IDs set on the vONU200 side) are set in the virtual NIC101-2 of. Then, in vPON2, by allocating a unique band to each of the 15 VLANs (VLANs of VLAN-IDs "2" to "16"), it is possible to realize the setting of the band-specific type. In the following, in the physical PON6, the VLAN of the VLAN-ID "1" set in vPON1 is referred to as "VLAN1", and the VLANs of the VLAN-IDs "2" to "16" set in vPON2 are referred to as "VLAN2", respectively. "To" VLAN16 ".

In the network system 1, the process of setting a plurality of vPON600s in the physical PON6 as described above is performed by the VNFM4 and the VIM5 controlling the control unit 12 (OLTC control unit 121) of the OLT10. That is, in the VNFM4 and the VIM5, the configuration information related to each vPON600 is generated (designed) and held.

Next, an example of the internal configuration of the VIM 5 will be described.

FIG. 2 is a block diagram showing a functional configuration of VIM5.

The VIM 5 has a control unit 51 and a data storage unit 52.

The VIM 5 may be configured by installing a program (including a physical PON management program according to the embodiment) on a computer such as a PC or a workstation.

The control unit 51 performs processing related to the control of the entire device, and has a physical PON control processing unit 511.

The data storage unit 52 stores physical PON setting data 521 which is configuration information of the physical PON 6 (for example, information including setting information and configuration information of each ONU 20 and OLT 10).

The physical PON control processing unit 511 performs a process of updating the data of the physical PON setting data 521 and a control process of changing the settings for the physical PON 6 (each ONU20 and OLT10) in response to the control of the LCM & O2, the VNFM4, or the like.

The physical PON control processing unit 511 performs processing for controlling each element of the physical PON 6 (each ONU 20 and OLT 10) according to the physical PON setting data 521 of the data storage unit 52.

It is assumed that at least the OLT setting data 521a, the ONU setting data 521b, and the bandwidth allocation data 521c are stored in the physical PON setting data 521.

FIG. 6 is an explanatory diagram showing a configuration example of the OLT setting data 521a.

As shown in FIG. 6, in the OLT setting data 521a, the setting data for the OLT 10 for each vPON 600 (vPON-ID) is registered.

In this embodiment, it is assumed that an ID for identifying each vPON 600 (hereinafter referred to as "vPON-ID") is assigned. In the following, the vPON-ID of vPON1 (vPON600-1) will be referred to as “1”, and the vPON-ID of vPON2 (vPON600-2) will be referred to as “2”.

In the OLT setting data 521a shown in FIG. 6, at least the corresponding MAC address and VLAN-ID are set for each vPON-ID.

FIG. 7 is an explanatory diagram showing a configuration example of ONU setting data 521b.

As shown in FIG. 7, in the ONU setting data 521b, setting data corresponding to each vONU 200 to which the ONU 200 belongs is registered for each vPON-ID. At least vONU-ID, physical ONU-ID, VLAN-ID, LLID, and MAC address are registered in the setting data of each vONU200. In the ONU setting data 521b shown in FIG. 7, the setting data corresponding to vONU200-101 to 200-110 belonging to vPON1 having vPON-ID 1 and vONU200-201 to 200- belonging to vPON2 having vPON-ID 2 The setting data corresponding to 215 and 215 are registered respectively.

FIG. 9 is an explanatory diagram showing a configuration example of the bandwidth allocation data 521c. 9 (a) to 9 (c) show band allocation data 521c having different allocation methods.

As shown in FIG. 9, the band allocation data 521c shows the band allocation state (distribution of wavelengths and time slots assigned to each band) for each wavelength (λ1 to λ3) corresponding to the OLT10.

In FIG. 9, for the sake of simplicity, the band allocation data 521c is shown in the form of a visual band graph, but in reality, the band allocation data 521c is used to draw a band graph as shown in FIG. It is assumed that the data is described in a required data format (for example, vPON-ID data corresponding to each slot constituting each wavelength). In the band graph shown in FIG. 9, continuous bands represent the distribution of continuous time slots.

Next, an example of the internal configuration of the VNFM4 will be described.

FIG. 3 is an explanatory diagram showing a functional configuration of the VNFM4.

The VNFM4 has a control unit 41 and a data storage unit 42.

The VNFM 4 may be configured by installing a program (including a virtual PON management program according to the embodiment) on a computer such as a PC or a workstation, for example.

The data storage unit 42 stores vPON configuration data 421 (421-1, 421-2), which is setting information for each vPON 600. The vPON configuration data 421-1 and 421-2 are data corresponding to vPON1 and vPON2, respectively.

The control unit 41 performs processing related to the control of the entire device, and has a vPON control processing unit 411.

The vPON control processing unit 411 performs control processing such as updating the data of the physical PON setting data 521 and changing the settings for vPON600 (each vONU200 and vOLT100) according to the control of LCM & O2 or the like. The vPON control processing unit 412 performs processing for controlling each element of the vPON 600 (each vONU200 and vOLT100) according to the vPON configuration data 421 of the data storage unit 42.

FIG. 8 is an explanatory diagram showing a configuration example of vPON configuration data 421-1 and 421-2.

FIG. 8A shows a configuration example of vPON configuration data 421-1, and FIG. 8B is an explanatory diagram showing a configuration example of vPON configuration data 421-2.

As shown in FIG. 8, the vPON configuration data 421-1 and 421-2 include a vPON-ID and an ONU20 (physical ONU) ID corresponding to each vONU200 (hereinafter, referred to as “physical ONU-ID”). Information (hereinafter referred to as "traffic characteristic information") indicating the characteristics of the physical ONU-ID list indicating the above, the band setting condition, and the traffic flowing through the corresponding vPON 600 (traffic flowing through the virtual optical transmission line 400) is set. ..

The item of the band setting condition is information indicating the band setting method and the like given to each vONU200 of the corresponding vPON600. Here, it is assumed that the band setting type (for example, band sharing type or band-specific type) and the value (maximum value) of the band to be allocated are set in the band setting condition items.

In the item of the band setting condition of vPON1 shown in FIG. 8A, "band sharing type" is set as the band setting type, and the shared band (band shared by vPON1) = 8 Gbps is set. Further, in the item of the band setting condition of vPON2 shown in FIG. 8B, "band unique type" is set as the band setting type, and the unique band (unique band of each vONU 200) = 1 Gb / s is set. ing. The specific description format of the band setting condition is not limited, and the unique band may be set individually for each vONU200 (for each vONU-ID or physical ONU-ID).

The traffic characteristic information indicates, for example, a state in which burst-like traffic (for example, transfer of a large-capacity file) occurs in the corresponding vPON600, and the period during which the traffic does not occur is long (the period during which data transmission / reception does not occur is long). It is assumed that "burst traffic" and "always-use traffic" indicating a state in which traffic is constantly occurring are set. Other types of information may be set in the traffic characteristic information. Further, the traffic characteristic information may be deleted from the vPON configuration data 421.

As described above, in the virtual PON providing system 3, the vPON control processing unit 411 of the VNFM 4 and the physical PON control processing unit 511 of the VIM 5 control the virtual optical communication network system to configure the vPON on the physical PON 6. It has been realized.

(A-2) Operation of the Embodiment Next, the operation of the network system 1 of the embodiment having the above configuration will be described.

In (A-1), the configurations of two virtual mobile network systems 1000-1 and 1000-2 (including vPON1 and vPON2) as shown in FIG. 4 have been described. In the following, LCM & O2, INF & VNFM3, and VNFM4 cooperate to configure virtual mobile network systems 1000-1 and 1000-2 (including vPON1 and vPON2) in response to requests from customer terminals CT-1 and CT-2. The operation at the time of doing is explained.

The customer terminals CT-2 and CT-1 are slices having the capabilities required for the specifications of their own MVNO service (for example, specifications within the scope of the contract with the carrier that owns the network system 1) for LCM & O2, respectively. Request to provide. The specifications of the interface between the customer terminals CT-2 and CT-1 and the LCM & O2 are not limited, and various slice architecture configurations can be applied. Here, the first customer terminal CT-1 refers to the LCM & O2 between each virtual antenna device 500 of the virtual antenna device group 800-1 and the virtual base station 700-2 (that is, a section of vPON600-1). It is assumed that a virtual mobile network system 1000-1 of a type that does not prepare a fixed band (that is, a band sharing type) is requested. Further, the second customer terminal CT-2 is connected to the LCM & O2 between each virtual antenna device 500 of the virtual antenna device group 800-2 and the virtual base station 700-2 (that is, a section of vPON600-2). It is assumed that a virtual mobile network system 1000-2 of a type that prepares a fixed band (that is, a band-specific type) is requested.

Then, LCM & O2 obtains the VNF of each element (VNF of each element constituting the virtual mobile network systems 1000-1 and 1000-2) necessary to achieve the required conditions of each requested slice. Instruct the INF & VNFM of each element to provide the required VNF and resources.

Here, the LCM & O2 requests the virtual PON providing system 3 (INF & VNFM of the access network) vPON1 and vPON2 (vPON600-1, 600-2) to be incorporated into the requested slice.

Specifically, LCM & O2 sets vPON1 and vPON2 for VNFM4 and VIM5 as setting conditions (for example, conditions such as the number of vONU200 and band setting of PON section; hereinafter referred to as "vPON setting condition"). Request with. VNFM4 and VIM5 request the setting of resources for constructing the requested two sets of vPON600 (vPON1, vPON2) on one existing infrastructure (physical PON6), and the infrastructure (physical PON6) is requested to set the resources. Control to make such settings. The vPON setting condition may include at least data in the same format as the "physical ONU-ID list" item, the "bandwidth setting condition" item, and the "traffic characteristic information" item of the vPON configuration data 421. Good.

Here, the LCM & O2 sets the vPON setting condition of the vPON1 for the first customer for the virtual PON providing system 3 (VNFM4 and VIM5) as the vONU200 based on 10 vONU200s (ONU20-1 to 20-10). ) And the 8 Gb / s band shared by the 10 vONU200s. That is, the vPON setting condition of vPON1 is that the number of vONU200 is 10, and the bandwidth sharing type policy in which the shared bandwidth is 8 Gb / s is applied.

Further, here, the LCM & O2 is based on 15 vONU200 (ONU20-1 to 20-15) as the vPON setting condition of vPON2 for the second customer with respect to the virtual PON providing system 3 (VNFM4 and VIM5). It is assumed that a band of 1 Gb / s is set for each of the vONU200) and the 15 vONU200s. That is, the vPON setting condition of vPON2 is that the number of vONU200 is 15, and the band-specific type policy in which the unique band of each vONU200 is 1 Gb / s is applied.

Then, the VNFM4 and the VIM5 design vPON1 and vPON2 that meet the vPON setting conditions (designed as a configuration that can be set in the physical PON6) in response to the request of the LCM & O2.

Specifically, the vPON control processing unit 411 of the VNFM4 creates and sets the vPON configuration data 421-1 as shown in FIG. 8A according to the setting conditions of the vPON1. Further, the vPON control processing unit 411 of the VNFM4 creates and sets the vPON configuration data 421-2 as shown in FIG. 8B according to the setting conditions of the vPON2. The vPON control processing unit 411 of the VNFM4 sets at least the items of the physical ONU-ID list, the band setting condition, and the traffic characteristic information of the vPON configuration data 421-1 and 421-2 based on the contents of the vPON setting condition from the LCM & O2. Can be set.

Then, the physical PON control processing unit 511 of the VIM 5 designs the setting contents in the physical PON 6 for constructing the vPON 1 and vPON 2 according to the vPON configuration data 421-1 and 421-2.

Specifically, the physical PON control processing unit 511 of the VIM 5 creates the OLT setting data 521a and the ONU setting data 521b according to the vPON configuration data 421-1 and 421-2.

As shown in FIG. 8A, the physical ONU-ID list of vPON1 is 1, 2, ..., 10, and the band setting condition is the band sharing type. Therefore, the physical PON control processing unit 511 of the VIM5 Assigns the virtual NIC101 (including the MAC address) corresponding to vPON1 to the OLT10, and assigns the virtual NICs 21, 101 (including the MAC address) and the LLID corresponding to vPON1 to each of ONU20-1 to 20-10. One common VLAN-ID is assigned to each virtual NIC 21 and 101 of vPON1. Then, the physical PON control processing unit 511 of the VIM 5 registers the result of the addition to the vPON 1 in the OLT setting data 521a and the ONU setting data 521b.

Further, as shown in FIG. 8B, the physical ONU-ID list of vPON2 is 1, 2, ..., 15, and the band setting condition is a band-specific type. Therefore, the physical PON control process of VIM5 Part 511 assigns the virtual NIC101 (including the MAC address) corresponding to vPON2 to the OLT 10, and assigns the virtual NIC21 (including the MAC address) and the LLID corresponding to vPON2 to each of the ONUs 20-1 to 20-15. A separate VLAN-ID is assigned to each ONU20-1 to 20-15 virtual NIC21, and all ONU20 (20-1 to 20-15) VLAN-IDs (15 VLANs) are assigned to the OLT10 virtual NIC21. -ID) is given. Then, the physical PON control processing unit 511 of the VIM 5 registers the result of granting to vPON2 in the OLT setting data 521a and the ONU setting data 521b.

As described above, when the physical PON control processing unit 511 of the VIM5 creates the OLT setting data 521a and the ONU setting data 521b according to the vPON configuration data 421-1 and 421-2, the results are shown in FIGS. 6 and 7. The contents will be.

Next, when the physical PON control processing unit 511 of the VIM5 sets the physical PON6 (ONU20-1 to 20-15, OLT10) according to the OLT setting data 521a and the ONU setting data 521b as shown in FIGS. 6 and 7. The result is as shown in FIG. That is, by the above processing, vPON1 and vPON2 as shown in FIG. 4 are formed on the physical PON6.

Further, the physical PON control processing unit 511 of the VIM 5 designs the bandwidth configuration to be given to the vPON1 and vPON2 according to the contents of the vPON configuration data 421-1 and 421-2, and sets the bandwidth allocation data 521c.

Here, an example of a band allocation method by the physical PON control processing unit 511 of the VIM 5 will be described. Here, it is assumed that two optical transmitters / receivers are built in each ONU. (Alternatively, regardless of the explanation so far, consider the case where the number of physical ONUs is 26 and the ONU to which VPON1 is assigned and the ONU used for VPON2 are different ONUs).

Here, since the band setting condition of vPON1 (vPON configuration data 421-1) is "bandwidth shared type, shared band = 8 Gb / s", the total band assigned to vPON1 is 8 Gb / s. The band setting condition of vPON2 (vPON configuration data 421-2) is "band unique type, unique band of each vONU = 1 Gb / s", and the physical ONU-ID list is "1, 2, ..., 15". Therefore, the total bandwidth assigned to vPON2 is 15 Gb / s.

As described above, in the OLT 10, a total band of 30 Gbps (10 Gbps × 3) can be set by using optical communication channels of three wavelengths (λ1 to λ3). High-speed optical communication is possible if the bands of each vPON600 are combined into one wavelength. If one band is set across a plurality of wavelengths, it may be necessary to change the wavelength on the ONU20 side (for example, change the setting of a light emitting element (not shown)) during communication, so that a delay occurs in communication. There is a risk of

However, since the wavelength (optical communication channel) in the PON section is a finite resource, if different wavelengths are assigned to all the bands, problems such as insufficient bands to be allocated to the newly set vPON occur. Therefore, a policy for efficiently allocating the band of each wavelength to each vPON is required.

Here, an example of applying the following first to third band setting policies will be described. In the following first to third band setting policies, some policies may be omitted or other policies may be added.

[First band setting policy] The PON band including the band sharing type band allocates a band of continuous time slots within one wavelength as much as possible.

[Second band setting policy] The vPON band composed of bands of only the band-specific type may span a plurality of wavelengths.

[Third Band Setting Policy] Within the range of the first and second band setting policies, bandwidth allocation that leaves free bandwidth in continuous time slots is performed as much as possible.

Next, in accordance with the above-mentioned first to third policies, the wavelengths λ1 to λ3 are set to vPON1 (band of 8 Gb / s including the band sharing type band) and vPON2 (band of 10 Gbps only for the band specific type band). An example of allocating bandwidth will be described.

First, it is assumed that the physical PON control processing unit 511 of the VIM 5 performs the band allocation processing for vPON1. Since the band of vPON1 is a band of 8 Gb / s including the band of the band sharing type, the physical PON control processing unit 511 of VIM5 has the vPON1 within one wavelength according to the first and third band setting policies. While giving priority to the bandwidth allocation in, the bandwidth allocation that leaves the free bandwidth of the time slots that are continuous as much as possible will be performed. As a result, the physical PON control processing unit 511 of the VIM 5 secures a band of 8 Gb / s at the beginning of the wavelength λ1 and allocates it to vPON1.

Next, it is assumed that the physical PON control processing unit 511 of the VIM 5 performs the band allocation processing for vPON2. The band of vPON2 is "band-specific type and unique band of each vONU = 1 Gb / s". Therefore, the physical PON control processing unit 511 of the VIM 5 allows the band allocation across a plurality of wavelengths for vPON2 in accordance with the second and third band setting policies, and makes the free band of the time slot as continuous as possible. The remaining bandwidth will be allocated. As a result, the physical PON control processing unit 511 of the VIM5 secures the remaining 2 Gbps band at the wavelength λ1, the entire band (10 Gb / s) at the wavelength λ2, and the first 3 Gb / s band at the wavelength λ3. It will be assigned to vPON2.

As described above, when the physical PON control processing unit 511 of the VIM 5 performs a process of allocating a band of wavelengths λ1 to λ3 to vPON1 and vPON2 in accordance with the above-mentioned first to third policies, the resulting band allocation data. 521c has the contents as shown in FIG. 9B.

Next, it is verified whether the allocation method as shown in FIG. 9B is efficient.

In FIG. 9, in addition to FIG. 9 (b), the allocation method of FIGS. 9 (a) and 9 (c) is shown. Hereinafter, the allocation methods of FIGS. 9A to 9C will be referred to as the first allocation method to the third allocation method, respectively. When the physical PON6 uses multiple wavelengths for optical communication (here, three wavelengths λ1 to λ3) and it takes time to change the wavelength on the ONU20 side, the resource allocation method (band allocation method) to vPON is used. Can be considered as the first allocation method to the third allocation method shown in FIGS. 9 (a) to 9 (c).

In the band allocation data 521c of the first allocation method shown in FIG. 9A, all bands (10 Gb / ps) are allocated to vPON2 for the wavelength λ1. Further, in the band allocation data 521c of the first allocation method shown in FIG. 9A, the first 5 Gb / s is assigned to vPON2 and the subsequent 5 Gb / s is assigned to vPON1 for the wavelength λ2. .. Furthermore, in the band allocation data 521c of the first allocation method shown in FIG. 9A, the first 3 Gb / s of the wavelength λ3 is assigned to vPON1.

The third allocation method is vPON1 and vPON2, which allocate bands having different wavelengths as much as possible. In the band allocation data 521c of the third allocation method shown in FIG. 9C, the first 8 Gb / s of the wavelength λ1 is allocated to vPON1, and the subsequent 2 Gb / s is a free band. Further, in the band allocation data 521c of the third allocation method shown in FIG. 9C, all the bands (10 Gb / s) for the wavelength λ2 are allocated to vPON2. Further, in the band allocation data 521c of the third allocation method shown in FIG. 9C, the first 5 Gb / s is allocated to vPON2 for the wavelength λ3, and the subsequent 5 Gb / s becomes a free band. There is.

When the most efficient allocation method is examined for the above first to third allocation methods, the most efficient allocation method is the second allocation method. The reasons for such a conclusion are explained below. vPON1 shares 8 Gb / s among 10 vONU200s. Therefore, in the first allocation method, the band of vPON1 spans a plurality of wavelengths. Therefore, if the resource of vONU200-101 is allocated to λ3 and the required band exceeds 3 Gb / s, the other Even if the band required by the vONU200 is small, it is not immediately possible to increase it to 3 Gb / s or more, and the wavelength must be changed to λ2. Even in that case, the vONU200-101 set to λ3 has a problem that a band exceeding 5 Gb / s cannot be used. In vPON2, each vONU200 fixedly secures 1 Gb / s, so if there is an allocation limit in 1 Gb / s units (1 time slot = 1 Gb / s), any allocation method is inconvenient for vPON2. Few. Further, when there is an additional request for a bandwidth sharing type vPON, in order to receive a request for as large a bandwidth as possible, the second allocation method that maximizes the continuous unused area is the third allocation. It can be said that it is more appropriate than the one. For the above reasons, it can be said that the second allocation method (the allocation method according to the above-mentioned first to third band setting policies) is appropriate. However, in the case of the second allocation method, when it is necessary to increase the band of VPON1, it is necessary to move VPON2 allocated to λ1 to λ3. During this time, there is a risk that the ONU to which the wavelength to be moved by VPON2 is assigned becomes unusable. Therefore, if the goal is not an excellent allocation in response to a new VPON request, but a quick response when the bandwidth required by VPON1 increases, the third allocation method is the most suitable. This is a suitable allocation method.

Up to this point, the band allocation method in consideration of the "band setting condition" of the vPON configuration data 421 has been described, but the traffic characteristic information may also be considered.

Hereinafter, the third to sixth vPON600s are tentatively referred to as "vPON3" to "vPON6". It is assumed that the band setting conditions of "vPON3" to "vPON6" are all band sharing types. Further, it is assumed that the traffic characteristic information of vPON4 and vPON6 is burst traffic, and the traffic characteristic information of vPON3 and vPON5 is always-use traffic. Further, it is assumed that the band allocated to vPON3 is 6 Gb / s, the band allocated to vPON4 is 3 Gb / s, the band allocated to vPON5 is 4 Gb / s, and the band allocated to vPON6 is 4 Gb / s.

FIG. 10 is an explanatory diagram showing an example of how to allocate the bands of vPON3 to vPON6.

In FIG. 10, the allocation method of FIGS. 10 (a) and 10 (b) is shown. Hereinafter, the allocation methods of FIGS. 10 (a) and 10 (b) will be referred to as a fourth allocation method and a fifth allocation method, respectively.

When the physical PON control processing unit 511 of the VIM 5 performs a process of allocating a band of wavelengths λ1 to λ3 to vPON3 to vPON5 in accordance with the above-mentioned first to third policies, the resulting band allocation data 521c is shown in FIG. The content is as in a). In the band allocation data 521c of the fourth allocation method shown in FIG. 10A, the first 6 Gb / s band of the wavelength λ1 is assigned to vPON3, and the subsequent 3 Gb / s band is assigned to vPON4. .. Further, in the band allocation data 521c of the fourth allocation method shown in FIG. 10A, the first band of 4 Gb / s is allocated to vPON5 for the wavelength λ2, and the subsequent band of 4 Gb / s is assigned to vPON5. It is assigned to vPON6.

In FIG. 10A, the wavelength λ1 is a mixture of vPON3, which is a constant-use traffic, and vPON4, which is a burst-type traffic. Further, regarding the wavelength λ2, vPON5 of the constant use type traffic and vPON6 of the burst type traffic are mixed. In this case, since the wavelengths λ1 and λ2 both include the band of always-use traffic, the OLTC112-1 and 112-2 corresponding to the wavelengths λ1 and λ2 on the OLT10 side are in a state of being constantly operating.

However, as shown in FIG. 10B, by collecting only the bands of vPON4 and vPON6 of burst traffic at the wavelength λ1, the OLT 10 side is used for the period during which burst traffic does not occur in vPON4 and vPON6. It is possible to suspend the OLTC 112-1 corresponding to the wavelength λ1 and operate it with low power consumption. In other words, by collecting the burst traffic band at the same wavelength and not allocating the always-use traffic band to that wavelength, the power saving operation of the OLT 10 becomes possible.

That is, in the fifth allocation method shown in FIG. 10B, in addition to the above-mentioned first to third policies, as a fourth band control policy, "burst traffic bands are collected at the same wavelength, and the wavelengths thereof are collected. By additionally setting a policy of "not allocating the bandwidth of always-use traffic to the computer", the power saving operation of the OLT 10 becomes possible. In the band allocation data 521c of the fifth allocation method shown in FIG. 10B, the first 4 Gb / s band of the wavelength λ1 is assigned to vPON6, and the subsequent 3 Gb / s band is assigned to vPON4. .. Further, in the band allocation data 521c of the fifth allocation method shown in FIG. 10B, for the wavelength λ2, the first 4 Gb / s band is assigned to vPON5, and the subsequent 6b / s band is assigned to vPON3. Assigned.

In this embodiment, the combination of the first to fourth band setting policies described above has been described as the band allocation algorithm, but the combination of the band setting policies is free. For example, a plurality of bandwidth allocation algorithms (sets of bandwidth setting policies) are prepared in the physical PON control processing unit 511 of the VIM5 and changed according to the customer or vPON setting conditions, or the physical PON control processing unit 511 of the VIM5 can be used. An environment that enables programming of the bandwidth allocation algorithm may be prepared freely.

(A-3) Effect of Embodiment According to this embodiment, the following effects can be achieved.

(A-3-1) First Problem In the network system 1 (virtual PON providing system 3) of this embodiment, a logical path and a VLAN setting using different LLIDs (identifiers on the PON section) are set for each vPON 600. It is configured so that it can be controlled in units of vPON600 by performing the communication using it. As a result, the network system 1 (virtual PON providing system 3) of this embodiment provides means for constructing a plurality of vPON 600s using the physical PON 6 of this embodiment. That is, in the network system 1 (virtual PON providing system 3) of this embodiment, there is no means for dynamically constructing a plurality of virtual PONs by using the above-mentioned [first problem] (physical PONs). ) Can be solved.

(A-3-2) Second Problem In the network system 1 (virtual PON providing system 3) of this embodiment, by applying different bandwidth control settings using VLAN, LLID, etc. for each vPON600, 1 On the physical PON6, different bandwidth setting policies (for example, bandwidth sharing type, bandwidth specific type, etc.) can be applied. As a result, in the virtual PON providing system 3, for example, a plurality of setting algorithms (for example, VLAN setting and bandwidth allocation algorithms (policy)) corresponding to the policy applied to the vPON 600 (policy according to the request of LCM & O2) are prepared. By making the selection variable or freely setting by programming, it is possible to flexibly respond to the request of the customer (customer terminal CT). As described above, in the network system 1 (virtual PON providing system 3) of this embodiment, the above-mentioned [second problem] (when the policies of the plurality of virtual PONs to be constructed are different, they are different on one physical PON. The virtual PON of the policy cannot be constructed.) Can be solved.

(A-3-3) Third Problem In the network system 1 (virtual PON providing system 3) of this embodiment, the above-mentioned first band setting policy (the PON band including the band sharing type band is possible. As long as it is, the band for each vPON 600 can be allocated according to (allocating the band of continuous time slots within one wavelength). As a result, in the network system 1 (virtual PON providing system 3) of this embodiment, [third problem] (when the physical PON uses a plurality of wavelengths and it takes time to change the wavelength, the virtual PON is provided. There is no resource allocation means) can be solved.

(A-3-4) Fourth Problem In the network system 1 (virtual PON providing system 3) of this embodiment, the above-mentioned fourth band setting policy (“burst traffic bands are collected at the same wavelength and the same wavelength is collected). A band for each vPON 600 can be assigned according to "No band for always-use traffic is assigned to the wavelength"). Thereby, the network system 1 (virtual PON providing system 3) of this embodiment can solve the [fourth problem] (a method of providing a plurality of virtual PONs for power saving is not provided). ..

(B) Other Embodiments The present invention is not limited to the above embodiments, and modified embodiments as illustrated below can also be mentioned.

(B-1) In the above embodiment, in the vPON configuration data 421, each vONU200 belonging to the corresponding vPON600 has an acceptable delay time (for example, from the reception of the frame to the transfer) when transmitting the frame. The maximum value (hereinafter, the item of "maximum allowable standby time") may be set and reflected in the algorithm when the physical PON control processing unit 511 of the VIM 5 allocates the band to each vPON 600. For example, in each ONU20, the time required for switching the wavelength applied to the PON section (communication with the OLT10) (hereinafter referred to as “wavelength switching time”) is T1 second, and the maximum allowable delay time is T2 seconds. It is assumed that the case was. For example, when T2 <T1, it is not permissible for each vONU200 to receive a certain frame, switch the wavelength, and then transfer the frame. On the other hand, when T2> T1, it is permissible for each vONU200 to receive a certain frame, switch the wavelength, and then transfer the frame. For vPON600 with a shared band, it is desirable to continuously set the same wavelength band. Therefore, for example, when the physical PON control processing unit 511 of the VIM5 allocates a band to each vPON 600, "for a vPON in which T2> T1 is obtained even in the band sharing type, a band allocation that leaves a free band of continuous time slots is assigned. You may want to add a fifth bandwidth setting policy that says "allow to do".

1 ... network system, 2 ... LCM & O, 3 ... virtual PON providing system, 4 ... VNFM, 41 ... control unit, 411 ... vPON control processing unit, 42 ... data storage unit, 421, 421-1, 421-2 ... vPON configuration Data, 421a ... vOLT configuration information, 421b ... vONU configuration information, 5 ... VIM, 51 ... control unit, 511 ... physical PON control processing unit, 52 ... data storage unit, 521 ... physical PON setting data, 521a ... OLT setting data, 521b ... ONU setting data, 521c ... Band allocation data, 6 ... Physical PON, 7 ... Base station device, 8 ... Antenna device group, 9 ... Mobility management device, 10 ... OLT, 11 ... Transport unit, 111 ... Optical filter, 112, 112-1, 112-2, 112-3 ... OLTC, 13 ... Switch, 12 ... Control unit, 121 ... OLT control unit, 101, 101-1, 101-2 ... Virtual NIC, 20, 20-1 to 20-15 ... ONU 20, 21, 21-101-21-110, 21-201-21-215 ... Virtual NIC, 30 ... Splitter, 40 ... Optical fiber, 50, 50-1 to 50-15 ... Antenna device, 1000 , 1000-1, 1000-2 ... Mobile network system, 100, 100-1, 100-2 ... vOLT, 200-101-200-110, 200-201-200-215 ... vONU400, 400-1, 400- 2 ... Virtual optical transmission line, 500, 500-101 to 500-110, 500-201 to 500-215 ... Virtual antenna device, 501 ... Cable, 600, 600-1, 600-2 ... vPON, 700, 700-1 , 700-2 ... Virtual base station device, 800, 800-1, 800-2 ... Virtual antenna device group, 900 ... Virtual mobility management device, 1000, 1000-1, 1000-2 ... Virtual mobile network system, CT, CT-1, CT-2 ... Customer terminal, ET ... Terminal, N1 ... Metro network, N100 ... Virtual metro network, N2 ... Core network, N200 ... Virtual core network.

Claims (5)

An optical communication network system including one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device.
A virtual slave station communication device is set in each of the slave station communication devices, a virtual master station communication device is set in the master station communication device, and a plurality of the virtual slave station communication devices and one virtual master station communication device are installed. It controls each of the combined virtual optical communication network systems, and has a virtual optical communication network system control means that sets a separate communication band of the optical transmission line for each of the virtual optical communication network systems. And
The virtual optical communication network system control means includes a first virtual optical communication network system in which a shared communication band shared by a plurality of virtual slave station communication devices is set in the optical communication network system, and each of the slave stations. It is possible to simultaneously set up the second virtual optical communication network system in which a separate unique communication band is set in the communication device.
An optical signal is transmitted by the TDMA method in the optical transmission line.
The virtual optical communication network system control means preferentially allocates a communication band of continuous time slots at the same wavelength to the first virtual optical communication network system .
The virtual optical communication network system control means has a continuous time within one wavelength as much as possible for the virtual optical communication network system in which a shared communication band shared by the plurality of virtual slave station communication devices is set. For the first band setting policy of allocating the communication band of the slot and the virtual optical communication network system in which a separate unique communication band is set for each slave station communication device, the communication band spans a plurality of wavelengths. Is continuous for each of the virtual optical communication network systems as much as possible within the scope of the second band setting policy, the first band setting policy, and the second band setting policy. A communication system characterized in that the communication band of the optical transmission line is allocated to each of the virtual optical communication network systems in accordance with a third band setting policy of allocating a band that leaves an empty communication band of the time slot. The virtual optical communication network system control means collects the communication bands of the virtual optical communication network system having the first traffic characteristic of high burst property and long non-traffic period at the same wavelength as much as possible. The communication band is allocated to the wavelength, and a fourth band setting policy is added so that the communication band of the virtual optical communication network system having the second traffic characteristic that traffic always occurs is added to the virtual optical communication network system. The communication system according to claim 1 , wherein the communication band of the optical transmission line is allocated to the optical communication network system. It controls an optical communication network system including one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device. , A virtual slave station communication device is set in each of the slave station communication devices, a virtual master station communication device is set in the master station communication device, and a plurality of the virtual slave station communication devices and one virtual master station communication device are set. The control is performed for each virtual optical communication network system, which is a slice combining the above, and the optical transmission lines are separate based on the management of the customer terminal separately defined for each virtual optical communication network system. A control system characterized by having a virtual optical communication network system control means for setting a communication band of the above. The virtual optical communication network system control means accepts and accepts at least one process of construction, monitoring, modification, and deletion of the virtual optical communication network system as a process of management of the virtual optical communication network system by the customer terminal. The control system according to claim 3, wherein a communication band of the optical transmission line is set for the virtual optical communication network system based on the management process. The third or fourth aspect of the optical communication network system including one master station communication device, a plurality of slave station communication devices, and an optical transmission line branched and connected from the master station communication device to the slave station communication device. An optical communication network system characterized in that it operates in response to the control of the described control system.

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