JP5314510B2 - Bandwidth management control system and bandwidth management control method - Google Patents

Description

  The present invention relates to a technology of a bandwidth management control system and a bandwidth management control method for managing and controlling a bandwidth of a communication path in a next generation network (NGN).

  Conventionally, by selecting the forwarding path class based on the setting of the permission / non-permission of input / output to the route setting information in the router, the bandwidth upper limit value, the priority of the call requesting session establishment, etc. A method of providing a user with a certain quality (QoS: Quality of Service) has been used.

  For example, in Patent Document 1, when there is a request for connection of a new call, all the priority qualities are evaluated by adding the new call, and when the evaluated quality cannot be satisfied, A technique for accepting a new call after reviewing the priority and resetting the priority is disclosed. Patent Document 2 discloses a technique for exchanging resource information between nodes, having all resource information on a route at an edge node, and performing admission control autonomously. Further, in Patent Document 3, if the remaining network resources do not satisfy the QoS request service, the acceptance is rejected, the service is started with an assignable bandwidth, and the bandwidth is gradually increased every time the necessary bandwidth is secured. An assigning technique is disclosed. Furthermore, in Patent Document 4, for the purpose of providing services to each user fairly, a technique for controlling the number of used flows and the used bandwidth for each user based on a contract value, that is, the used bandwidth exceeds the number of contracts. In this case, a technique for rejecting reception is disclosed.

JP 2003-244218 A JP 2004-080250 A JP 2000-138680 A JP 2000-324160 A

  However, since communication lines secured on the Internet are mainly best-effort, delays, congestion, etc. are required when service provision is required that requires a bandwidth larger than the bandwidth of the physical communication path. As a result, the communication quality deteriorates, and due to the vulnerability based on the open nature inherent in the Internet, there is a problem that a satisfactory service is not provided to the user.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a bandwidth management control system and a bandwidth management control method for managing and controlling the bandwidth of a communication path so as to guarantee higher communication quality than the Internet. To do.

The present invention as set forth in claim 1 is an access network for bundling a plurality of subscriber terminals using a VLAN, and a bandwidth management control device for managing and controlling the bandwidth of a communication path of the access network via a service edge And a core network that statically routes from the service edge to the edge router, the bandwidth management control device includes a physical network between at least three nodes constituting the access network. Each communication path is designated as a first virtual path and a second virtual path, management storage means for managing and storing in association with each upper limit band in each communication path, and a request flow is transmitted from the subscriber The management record for the first virtual path and the second virtual path through which the request flow passes. When it is determined whether the bandwidth of the request flow can be stacked within a range not exceeding the upper limit bandwidth read from the means, and the stacking is possible for all of the first virtual path and the second virtual path to, have a, and bandwidth management means for keeping bandwidth of the request flow, said management storage means, permitting the band of the first virtual path, a bandwidth of the low latency and low-loss EF class, delay And a management QoS class consisting of a best-effort BE class bandwidth, and the bandwidth management means sets the upper limit of the communication path for the downstream bandwidth of the first virtual path. A band value obtained by subtracting the BE class band and the IP broadcast band from the band is managed, and when the IP broadcast band is necessary, the AF class band is decreased, and the EF By band of Ras it is not changed, and summarized in that to secure a bandwidth for the IP broadcast.

In the present invention according to claim 2, the management storage means divides and manages the bandwidth of the management QoS class into a plurality of management service classes according to service types, and accepts the bandwidth of the management service class. An analysis unit that can be managed in association with a plurality of reception priority thresholds according to priority and that analyzes a QoS class, a service type, and a reception priority from the request flow transmitted from the subscriber. The bandwidth management means determines whether the request flow can be stacked in the management QoS class corresponding to the analyzed QoS class, and in the management service class corresponding to the analyzed service type, It is determined whether or not the request flows can be stacked, and the request flow is not exceeded in a range not exceeding the reception priority threshold corresponding to the analyzed reception priority. It determines whether it is possible piled up request flow, and be required to secure the bandwidth of the request flow when stacked is possible in all judgment.

  According to the third aspect of the present invention, the management storage means can manage the bandwidth of the second virtual path in association with a plurality of service thresholds according to service types, and is transmitted from the subscriber. Whether the request flow can further be accumulated within a range that does not exceed the service threshold value corresponding to the analyzed service type. The gist is to secure the bandwidth of the request flow when it is possible to accumulate in the determination.

  The present invention according to claim 4, wherein the management storage means can manage the first virtual path and the second virtual path using different virtual paths in the uplink direction and the downlink direction, The gist of the bandwidth management means is that the bandwidth of the first virtual path and the bandwidth of the second virtual path in the upstream direction and the downstream direction can be dynamically changed.

  In the present invention according to claim 5, the three or more nodes include a plurality of ONUs connected to the plurality of subscriber terminals, an OLT that bundles the plurality of ONUs, and the subscribers in the access network. Each of the layer 2 switch connected to the OLT and the service edge connected to the layer 2 switch, wherein the management storage means is between the ONU and the OLT. The gist is to manage between the OLT and the layer 2 switch as the second virtual path and to manage between the layer 2 switch and the service edge as the first virtual path.

The present invention according to claim 6 , wherein the layer 2 switch preferentially uses the band of the EF class to the service edge when the request flow transmitted from the subscriber is session admission control. The gist is to transfer.

The present invention according to claim 7 is an access network for bundling a plurality of subscriber terminals using a VLAN, and a bandwidth management control device for managing and controlling a bandwidth of a communication path of the access network via a service edge And a core network that statically routes from the service edge to the edge router, in the bandwidth management control device, the bandwidth management control device uses the bandwidth management control device to physically connect at least three or more nodes constituting the access network. A first step of making each communication path a first virtual path and a second virtual path, and managing and storing them in the management storage means in association with each upper limit band in each communication path, and a request from the subscriber When a flow is transmitted, the first virtual path and the second virtual path through which the request flow passes. And determining whether or not the bandwidth of the request flow can be accumulated within a range not exceeding the upper limit bandwidth read from the management storage means, and the accumulation is performed for all of the first virtual path and the second virtual path. If it is possible, have a, a second step of securing the band of the request flow, the first step, the band of the first virtual path, low delay and low loss EF class , A management QoS class consisting of a bandwidth of an AF class that allows delay and a bandwidth of a best-effort type BE class, and the second step includes a downstream direction of the first virtual path. If a bandwidth value obtained by subtracting the BE class bandwidth and the IP broadcast bandwidth from the upper limit bandwidth of the communication path is managed, and the IP broadcast bandwidth is required, the AF class bandwidth is Reducing the bandwidth of the EF class by not changing, and summarized in that to secure a bandwidth for the IP broadcast.

The present invention according to claim 8 divides and manages the bandwidth of the management QoS class into a plurality of management service classes according to service types, and manages the bandwidth of the management service class according to reception priority. And a third step of analyzing a QoS class, a service type, and a reception priority from the request flow transmitted from the subscriber. In the management QoS class corresponding to the analyzed QoS class, it is determined whether the request flows can be stacked, and the request flow is determined in the management service class corresponding to the analyzed service type. The request flow within a range not exceeding the reception priority threshold corresponding to the analyzed reception priority. Determines whether it is possible stacked, and summarized in that to secure the bandwidth of the request flow when stacked is possible in all judgment.

  In the present invention according to claim 9, in the first step, the bandwidth of the second virtual path can be managed in association with a plurality of service thresholds according to a service type, and transmitted from the subscriber. A third step of analyzing a service type from the analyzed request flow, wherein the second step accumulates the request flow within a range not exceeding the service threshold corresponding to the analyzed service type. The gist is to determine whether it is possible and to secure the bandwidth of the request flow when accumulation is possible in the determination.

  In the present invention according to claim 10, in the first step, the first virtual path and the second virtual path can be managed using different virtual paths in the uplink direction and the downlink direction, The gist of the second step is that the bandwidth of the first virtual path and the bandwidth of the second virtual path in the uplink direction and the downlink direction can be dynamically changed.

  According to the present invention, it is possible to provide a bandwidth management control system and a bandwidth management control method for managing and controlling the bandwidth of a communication path so as to guarantee higher communication quality than the Internet.

It is a figure which shows the system configuration | structure of the band management control system which concerns on this Embodiment. It is a figure explaining the QoS function of each apparatus which comprises a user VLAN area. It is a figure explaining the QoS function of each apparatus which comprises the static routing area. It is a figure which shows the bandwidth management method according to service and QoS class. It is a figure which shows the other band management method. It is a block diagram of the virtual path in a user VLAN section. It is a figure which shows the bandwidth management method of the uplink direction in a user VLAN area. It is a figure which shows the band management method of the downlink direction in a user VLAN area. It is a figure which shows QoS profile information. It is a figure which shows the specific example of the dynamic allocation of the virtual path bandwidth in SSE. It is a figure which shows the QoS class information according to QoS class. It is a figure which shows data flow information. It is a figure which shows a bandwidth management flow. It is a figure which shows L2SW virtual path structure information. It is a figure which shows OLT virtual path structure information. It is a figure which shows access line virtual path structure information.

[System configuration of bandwidth management control system]
First, the system configuration of the bandwidth management control system according to the present embodiment will be described. FIG. 1 is a diagram showing a system configuration of a bandwidth management control system according to the present embodiment. This bandwidth management control system realizes the control of the bandwidth of the communication path based on the SIP session control in order to guarantee the communication quality on the network for various services such as terrestrial digital broadcasting, telephone and VOD. Specifically, an access network 200 that bundles a plurality of subscribers with home gateways (HGWs) 41 such as information appliances and personal computers installed in the home, and a large-capacity edge A core network 300 composed of a router (ER: Edge Router) 31, a service edge (SSE: Subscriber Service Edge) 21 accommodating the above-mentioned fixed number of subscribers via the access network 200, an access network 200 and a core Bandwidth management system for managing and controlling the bandwidth of communication paths between devices (described later) constituting the network 300 Control device 100.

  The access network 200 is connected via a terminal unit (ONU: Operation Network Unit) 24 that connects the HGW 41 in each subscriber's home to an optical fiber subscriber communication network, and a GE-PON (Gigabit Ethernet-Passive Optical Network). A terminal unit (OLT: Optical Line Terminal) 23 that bundles a plurality of ONUs 24, a layer 2 switch (L2SW) 22 that can logically divide the communication network in the access network 200 for each subscriber, and The service edge (SSE: Subscriber Service Edge) 21 up to the entry side. The communication network in the section from the HGW 41 to the entry side of the SSE 21 is logically divided by the L2SW 22, and the section is hereinafter referred to as a user VLAN section. The entry side of the SSE 21 indicates a physical interface directly connected to the access network 200, but also includes setting information such as IP address information and an upper limit bandwidth allocated to the interface.

  The core network 300 corresponds to a next generation network (NGN: Next Generation Network) and includes a plurality of ERs 31. Unlike the access network 200 that directly accommodates subscribers, there is no need to be aware of the existence of individual subscribers, and a function to transfer service data such as video at high speed is required. The transfer route is set statically. Hereinafter, the section is referred to as a static routing section.

  The bandwidth management control device 100 includes a session control unit 11, a bandwidth management unit 12, a subscriber information management unit 13, and a data storage unit 14. This bandwidth management control apparatus 100 corresponds to an SGN (Subscriber Session Control Server) in NGN, and is an interface (Gq ′, e2, e2,..., ETSI ES 282 001 / ETSI TS 183 017 / ETSI ES 283 034 / ETSI ES 283 035 e4).

  The session control unit 11 corresponds to a CSCF (Call Session Control Function) in NGN, performs session control by SIP, and based on media information described in SDP (Session Description Protocol) of the SIP INVITE message It has a function to analyze required bandwidth and transfer quality class necessary for service provision.

  The bandwidth management unit 12 corresponds to RACS (Resource and Admission Control Subsystem) in NGN, and the user VLAN section and the static routing section are used as QoS (Quality of Service) provision sections, and the QoS provision section is configured. The physical communication path between the devices is stored in the data storage unit 14 in association with the upper limit band of the communication path as a virtual path and managed, and the requested bandwidth and transfer analyzed by the session control unit 11 It has a function of performing a bandwidth product determination (described later) as to whether or not a quality class can be secured on a virtual path in a QoS provision section. In addition, the bandwidth management unit 12 includes an access line virtual path between each device (ONU 24, OLT 23, L2SW 22, SSE 21) constituting the access network 200 (an access line virtual path between the ONU 24 and the OLT 23, an OLT 23 and an L2SW 22). The bandwidth of the OLT virtual path between them, the L2SW virtual path between the L2SW 22 and the SSE 21) and divided into a plurality of QoS classes according to priority and a plurality of service classes according to service types, Based on the requested bandwidth and the transfer quality class analyzed by the session control unit 11, unique priority control is performed in each virtual path, and communication path resources are set for each subscriber and / or for each service by a combination of the priority control. Dynamic allocation, connection permission between subscriber's HGW and service provider, flow amount Please, also has a function to perform the priority control. Note that dynamic allocation here refers to dynamically changing (increasing or decreasing) the bandwidth of each virtual path, or dynamically opening and closing a port on a session basis. The bandwidth can be changed by changing each setting value such as the upper limit bandwidth assigned to the physical port of each device physically connecting each virtual path or a threshold value described later, or by raising or lowering the physical port. Means to adjust.

  The subscriber information management unit 13 corresponds to NASS (Network Attachment SubSystem) in NGN, and has a function of issuing an IP address to the HGW 41 and performing authentication by DHCP (Dynamic Host Configuration Protocol). Yes.

  The data storage unit 14 includes a virtual path managed by the bandwidth management unit 12, a QoS profile used for bandwidth accumulation determination (FIG. 9), information by QoS class (FIG. 11), data flow information (FIG. 12), L2SW virtual path information (FIG. 14), OLT virtual path information (FIG. 15), access line virtual path information (FIG. 16), and a function for storing mathematical expressions used for bandwidth product judgment are provided.

[About the QoS function deployed in each device in the QoS provision section]
Next, the QoS function provided in each device in the QoS provision section will be described. FIG. 2 is a diagram for explaining the QoS function of each device constituting the user VLAN section. In the user VLAN section located under the SSE 21, based on the requested bandwidth and the transfer quality class analyzed by the bandwidth management control device 100 using the service request requested by the subscriber (hereinafter referred to as “request flow”), It dynamically allocates communication path resources between devices and performs communication quality control.

  Specifically, in the ONU 24, priority control is performed by the same subscriber, and in the OLT 23, priority control is performed in the same VLAN and fair control is performed between the ONUs. In the L2SW 22, the bandwidth of the L2SW virtual path is divided in advance into a plurality of QoS classes (EF (Expedited Forwarding) class, AF (Assured Forwarding) class, BE (Best Effort) class) according to priority, The request flow is allocated to the QoS class corresponding to the QoS class of the request flow and transferred to the SSE 21, the surplus bandwidth is allocated to the best effort type BE class, and fair control is performed between the VLANs. In particular, when the request flow is session admission control (CAC), the request flow is assigned to an EF class or an AF class that prescribes a preferential assignment, and is transferred to the SSE 21 with priority over other flows. In the SSE 21, dynamic port opening / closing control is performed on a session basis based on a control instruction from the bandwidth management control device 100.

  FIG. 3 is a diagram for explaining the QoS function of each device constituting the static routing section. The SSE 21 performs fixed resource allocation and performs quality control by time-series traffic management based on priority control based on the QoS class allocated by the L2SW 22. Specifically, for example, when the request flow transferred from the L2SW 22 is the EF class, the request flow is transferred to the path of the EF 32a with low delay and low loss, and when the request flow is the BE class, the request flow is transferred to the path of the best effort type BE 32c. .

[About the management method of each virtual path in the VLAN section]
Next, a method for managing each virtual path in the VLAN section will be described. FIG. 4 is a diagram illustrating a bandwidth management method for each service and for each QoS class. As described above, the bandwidth management unit 12 of the bandwidth management control device 100 stores the configuration related to the communication path between each device as a virtual path in the data storage unit 14 in order to perform bandwidth management necessary for communication quality control in the NGN. Keep it in control. When there is a request flow from a subscriber, the available bandwidth is estimated, and if available, the bandwidth is specified and stacked.

  Specifically, bandwidth management is performed for each virtual path, QoS class, and service, and when the requested bandwidth is transmitted from the bandwidth management unit 12, the requested bandwidth is individually allocated. For example, the bandwidth of the virtual path is divided and managed for each QoS class, that is, class a is made to correspond to low delay and low loss IETF Diffserv EF (Expedited Forwarding), and delay is allowed for class b and class c Management is performed in association with IETF Diffserv AF (Assured Forwarding), and class d is associated with Best Effort (BE). The total bandwidth of all classes a to d is managed so as to be the upper limit bandwidth value of the virtual path.

  Further, the bandwidth of each QoS class is managed by being divided into service units (service a, service b, etc.) that use the QoS class. Note that the total bandwidth of all services is managed so as to be the upper limit bandwidth value of the QoS class.

  Further, the bandwidth of each service is shared and managed in units of reception priority, and the bandwidth is preferentially assigned to a request flow having a high priority. For example, in the case where there is a request flow with reception priority # 1 and a request flow with reception priority # 2, both of the service use bands currently in use up to reception priority threshold # 2 in service a If the request flow is accepted and the acceptance priority threshold value # 2 is exceeded, threshold control for accepting only the request flow with the acceptance priority # 1 is performed.

  In addition, when the requested bandwidth from the bandwidth management unit 12 is designated in both the upstream and downstream directions via the Gq ′ interface shown in FIG. 1, the bidirectional bandwidth is stacked and designated in one direction. If there is, the stacking management is performed either on the up or down side.

  FIG. 5 is a diagram illustrating another bandwidth management method. Unlike the method of managing the bandwidth of the virtual path divided into QoS classes and services, the bandwidth of the virtual path is set as the upper limit bandwidth value, and shared and managed for each service, so that the request flow of the service with high priority can be Threshold control that is preferentially received is performed. For example, when the service # 1 and the service # 2 are used and the service usage band currently in use is up to the service threshold # 2, the request flow relating to both services is accepted, and the service threshold # 2 is set. If it exceeds, threshold control for accepting only the request flow of service # 1 is performed. Similarly to the method shown in FIG. 4, threshold value control for preferentially receiving a highly urgent request flow is performed by sharing and managing the virtual path bandwidth in units of reception priority.

  FIG. 6 is a configuration diagram of a virtual path in the user VLAN section. The uplink bandwidth of the access line virtual path is allocated fairly by the OLT 23, and the upper limit is the VLAN bandwidth set for each subscriber. Therefore, the upper limit band is recalculated by increasing or decreasing the number of subscribers accommodated in the same OLT 23. Further, the access line virtual path band 25, the OLT virtual path band 26, and the L2SW virtual path band 27 can be managed using different virtual paths and upper limit bands in the upstream direction and the downstream direction, respectively.

  FIG. 7 is a diagram showing an upstream bandwidth management method in the user VLAN section. For the access line virtual path and the OLT virtual path, each virtual path is managed using the service sharing management method in the bandwidth management method described with reference to FIG. 5, and the L2SW virtual path is described with reference to FIG. The virtual path is managed by using the bandwidth management method for each service and QoS class. In particular, for the upstream bandwidth of the OLT virtual path and the L2SW virtual path, it is possible to manage the bandwidth value obtained by subtracting the BE bandwidth corresponding to class d from the value considering the physical link bandwidth (physical speed of the line) and the maximum throughput. It is said.

  FIG. 8 is a diagram illustrating a bandwidth management method in the downlink direction in the user VLAN section. Similar to the upstream bandwidth management method, for the access line virtual path and the OLT virtual path, each virtual path is managed using the service sharing management method, and for the L2SW virtual path, the bandwidth for each service and QoS class The virtual path is managed using the management method. In particular, for the downstream bandwidth of the OLT virtual path and the L2SW virtual path, a BE bandwidth corresponding to class d and a multicast service are provided from a value considering the physical link bandwidth (physical speed of the line) and the maximum throughput. The bandwidth value obtained by subtracting the bandwidth of the IP broadcast A and the bandwidth of the IP broadcast B can be managed.

  Note that the IP broadcast bandwidth necessary for each IP broadcast is QoS profile information set for each contracted subscriber (an example is shown in FIG. 9. This QoS profile information is defined in ETSI ES 283 034). Is stored and managed in the data storage unit 14 by the subscriber information management unit 13 so that the contracted subscriber is valid, that is, the request flow of the subscriber is displayed. When the information can be stacked, the subscriber information management unit 13 notifies the bandwidth management unit 12 of the IP broadcast bands required for the IP broadcast A and the IP broadcast B, respectively. Thereafter, the bandwidth management unit 12 virtualizes the access line virtual path bandwidth, the OLT virtual path bandwidth, and the L2SW virtual path bandwidth for the IP broadcast bandwidth. At this time, among the QoS classes in the L2SW virtual path, the bandwidths of class b and class c are both the same quality level, so they are reduced at the same ratio. Do not change to prevent.

  In addition, when the bandwidth is overflowed by the IP broadcast band notified by the subscriber information management unit 13, each device may notify the bandwidth management unit 12 and the subscriber information management unit 13 of an error. Is possible. It should be noted that dynamic control is performed by each device for a failure, and in particular, the operation state and physical link state of the SSE 21 are constantly monitored, and if any failure occurs, the upper limit bandwidth of the L2SW virtual path becomes zero. And the bandwidth management control device 100 is notified of the session accommodated in the L2SW virtual path as a bandwidth overflow state.

  FIG. 10 is a diagram illustrating a specific example of virtual path bandwidth dynamic allocation in SSE. As described above, the dynamic allocation control for each service and / or for each session in the SSE 21 allocates the link bandwidth (physical speed bandwidth of the line) to the QoS classes of class a to class d, and assigns each QoS class. Divide the bandwidth into service units that use the class. Then, a “deemed bandwidth” reflecting session information of the service is allocated to the allocated bandwidth of each service. Allocation for each service and / or session is performed by the bandwidth management unit 12 of the bandwidth management control device 100 to realize dynamic allocation control. In FIG. 10B, for example, EF class a is assigned to a video telephone service that requires real-time performance, and BE class d is assigned to a service such as Internet web browsing. Assigned.

[Band management flow of bandwidth management controller]
Next, the bandwidth management flow of the bandwidth management control apparatus 100 will be described. First, as described above, the bandwidth management unit 12 stores and manages the virtual path of the QoS providing section and the QoS class information for each QoS class shown in FIG. 11 in the data storage unit 14.

  First, when a request flow is transmitted from a subscriber, the session control unit 11 sets the values of parameters (request flow peak rate, QoS class, service type, etc.) of the data flow information shown in FIG. And the bandwidth management unit 12 is notified.

Next, the bandwidth management unit 12 reads out the virtual path of the QoS provision section from the data storage unit 14, and for all virtual paths (access line virtual path, OLT virtual path, L2SW virtual path) through which the request flow passes, Bandwidth accumulation determination is performed as to whether or not the logical session bandwidth obtained by the request flow can be stacked within a range not exceeding the upper limit bandwidth of each virtual path. As a result, when bandwidth accumulation is possible for all virtual paths, the request flows are stacked (reserving the bandwidth of the request flow), and the settings of the OLT 23, the L2SW 22, and the SSE 21 are permitted to permit connection to the request flow. Information is updated (see FIG. 13). Note that the peak bucket size σ _i at the time of the flow request is calculated using the equation (1) when determining the bandwidth increase. The logical session bandwidth e _iks is calculated using Equation (2). Further, the product band value can be calculated using Equation (3).

Next, the bandwidth accumulation determination method in each virtual path will be specifically described. First, for the bandwidth accumulation determination in the L2SW virtual path, the L2SW virtual path configuration information as shown in FIG. 14 is stored in the data storage unit 14, and the session control unit 11 sends the request flow transmitted from the subscriber. The bandwidth request direction, QoS class, service type, and reception priority are analyzed. Then, the bandwidth management unit 12 relates to the analyzed request flow (bandwidth request direction, QoS class, service type, reception priority), virtual path managed by the data storage unit 14 (hereinafter, The QoS class divided and managed by the virtual path is referred to as a management QoS class, and each service type is referred to as a management service class.) The service threshold U _mt and the reception priority threshold γ _ht shown in FIG. Bandwidth accumulation determination is performed in units of paths, QoS classes, and services.

Specifically, the bandwidth management unit 12 determines whether it is possible to accumulate request flows in the management QoS class corresponding to the analyzed QoS class, and requests in the management service class corresponding to the analyzed service type. It is determined whether the flow can be stacked, it is determined whether the request flow can be stacked within the range not exceeding the reception priority threshold corresponding to the analyzed reception priority, and can be stacked in all determinations In this case, it is determined that the bandwidth of the request flow can be increased. More specifically, when both the expressions (4) and (5) are satisfied, the bandwidth product is OK, and when at least one of the expressions is not satisfied, the bandwidth product is NG.

Further, for the bandwidth accumulation determination in the OLT virtual path, the OLT virtual path configuration information as shown in FIG. 15 is stored in the data storage unit 14, and the session control unit 11 sends the request flow transmitted from the subscriber. The bandwidth request direction and service type are analyzed. Then, the bandwidth management unit 12 uses those values (direction of bandwidth request, service type) related to the analyzed request flow, the virtual path managed by the data storage unit 14, and the service threshold value U _my shown in FIG. Thus, the bandwidth accumulation determination is performed for each virtual path.

Specifically, the bandwidth management unit 12 determines whether the request flows can be stacked within a range that does not exceed the service threshold corresponding to the analyzed service type. It is determined that the bandwidth of the flow can be increased. More specifically, when the expression (6) is satisfied, the bandwidth product is OK, and when the equation (6) is not satisfied, the bandwidth product is NG.

Further, for the bandwidth accumulation determination in the access line virtual path, the access line virtual path configuration information as shown in FIG. 16 is stored in the data storage unit 14, and the session control unit 11 is transmitted from the subscriber. Using the request flow, analyze the bandwidth request direction and service type. Then, the bandwidth management unit 12 uses those values (bandwidth request direction and service type) related to the analyzed request flow, the virtual path managed by the data storage unit 14, and the service threshold value U _my shown in FIG. Thus, the bandwidth accumulation determination is performed for each virtual path.

Specifically, the bandwidth management unit 12 determines whether the request flows can be stacked within a range that does not exceed the service threshold corresponding to the analyzed service type. It is determined that the bandwidth of the flow can be increased. More specifically, when the expression (7) is satisfied, the bandwidth product is OK, and when the equation (7) is not satisfied, the bandwidth product is NG.

Finally, a method of calculating the downstream bandwidth value when securing the bandwidth of IP broadcast A and IP broadcast B of the multicast service will be described. L2SW upper band _{C y} upper band _{C t} and the OLT virtual path of the virtual path, L2SW virtual path, from each physical link bandwidth of the OLT virtual path, a bandwidth in use IP broadcast B, used bandwidth × the IP Broadcast A It is possible to calculate by subtracting the bandwidth used for the number of subscribers of IP broadcast A and the bandwidth for class d. The bandwidth management unit 12 dynamically changes the settings of the SSE 21, L2SW 22, and OLT 23 so that the calculated upper limit bandwidths are obtained.

  According to the present embodiment, each physical communication path between each node (ONU 24, OLT 23, L2SW 22, SSE 21) constituting the access network 200 is defined as an access virtual path, an OLT virtual path, and an L2SW virtual path. , And stored in the data storage unit 14 in association with each upper limit bandwidth in each communication path, and when a request flow is transmitted from a subscriber, an access virtual path, an OLT virtual path, For the L2SW virtual path, it is determined whether the bandwidth of the request flow can be stacked within a range not exceeding each upper limit bandwidth, and when the stack for all the virtual paths is possible, the bandwidth of the request flow is secured. Assures a certain level of communication quality compared to conventional IP networks and ensures a reliable IP line close to the conventional telecommunication network line level. It can manage controlling the bandwidth of the channel so.

  Finally, the bandwidth management control apparatus 100 described in the present embodiment is configured by a computer, and each process of each functional block is executed by a program. Further, each processing operation of the bandwidth management control apparatus 100 described in each embodiment is recorded as a program on a recording medium such as a compact disk or a floppy (registered trademark) disk, and this recording medium is incorporated in a computer, or The bandwidth management control device 100 performs the above-described processing operations by downloading a program recorded on a recording medium to a computer via an arbitrary communication line or installing the program from the recording medium and operating the computer with the program. Of course, it can be made to function as.

100: Bandwidth management controller (SSC)
11 ... Session control unit (CSCF, analysis means)
12: Bandwidth management unit (RACS, bandwidth management means)
13. Subscriber information management unit (NASS)
14: Data storage unit (management storage means)
200 ... Access network 21 ... Service edge (SSE)
22 ... Layer 2 switch (L2SW)
23 ... Terminal equipment (OLT) on the telephone office side
24. Terminating equipment (ONU) on the subscriber's home side
300 ... Core network 31 ... Edge router (ER)
41 ... Home gateway (HGW, subscriber terminal)
S101 to S105 ... step

Claims (10)

An access network that bundles a plurality of subscriber terminals using a VLAN, a bandwidth management control device that manages and controls the bandwidth of the communication path of the access network via a service edge, and from the service edge to the edge router In a bandwidth management control system with a core network for static routing,
The bandwidth management control device includes:
Each physical communication path between at least three nodes constituting the access network is defined as a first virtual path and a second virtual path, and managed and stored in association with each upper limit band in each communication path. Management storage means,
When a request flow is transmitted from a subscriber, the request for the first virtual path and the second virtual path through which the request flow passes does not exceed the upper limit bandwidth read from the management storage unit. A bandwidth management unit that determines whether or not the bandwidth of a flow can be stacked, and when the stacking is possible for all of the first virtual path and the second virtual path, , have a,
The management storage means
The bandwidth of the first virtual path is managed by using a management QoS class composed of a low-delay and low-loss EF class bandwidth, an AF class bandwidth that allows delay, and a best-effort BE class bandwidth. And
The bandwidth management means includes
When a bandwidth value obtained by subtracting the BE class bandwidth and the IP broadcast bandwidth from the upper limit bandwidth of the communication path is managed for the downstream bandwidth of the first virtual path, and the IP broadcast bandwidth is required A bandwidth management control system for securing a bandwidth for the IP broadcast by reducing the bandwidth of the AF class and not changing the bandwidth of the EF class . The management storage means
The management QoS class bandwidth can be managed by dividing it into a plurality of management service classes according to the service type, and the management service class bandwidth can be managed in association with a plurality of reception priority thresholds according to the reception priority. Because
Further comprising analysis means for analyzing a QoS class, a service type, and a reception priority from the request flow transmitted from the subscriber;
The bandwidth management means includes
In the management QoS class corresponding to the analyzed QoS class, it is determined whether the request flow can be stacked, and the request flow can be stacked in the management service class corresponding to the analyzed service type. If the request flow can be stacked within a range that does not exceed the reception priority threshold corresponding to the analyzed reception priority, and can be stacked in all determinations The bandwidth management control system according to claim 1, wherein a bandwidth of the request flow is secured. The management storage means
The bandwidth of the second virtual path can be managed in association with a plurality of service thresholds according to the service type,
From the request flow transmitted from the subscriber, further comprising an analysis means for analyzing a service type,
The bandwidth management means includes
Determining whether the request flows can be stacked within a range not exceeding the service threshold corresponding to the analyzed service type, and securing the bandwidth of the request flows when the determination is possible in the determination. The bandwidth management control system according to claim 1 or 2, wherein The management storage means
The first virtual path and the second virtual path can be managed using different virtual paths in the uplink direction and the downlink direction,
The bandwidth management means includes
4. The bandwidth according to claim 1, wherein a bandwidth of the first virtual path and a bandwidth of the second virtual path in the uplink direction and the downlink direction can be dynamically changed. 5. Bandwidth management control system. The three or more nodes are:
A plurality of ONUs connected to the plurality of subscriber terminals; an OLT that bundles the plurality of ONUs; a layer 2 switch that logically divides the access network for each subscriber and is connected to the OLT; The service edge connected to the layer 2 switch,
The management storage means
Management between the ONU and the OLT, between the OLT and the layer 2 switch as the second virtual path, and management between the layer 2 switch and the service edge as the first virtual path The bandwidth management control system according to any one of claims 1 to 4, wherein: The layer 2 switch
6. The bandwidth management control according to claim 5, wherein when the request flow transmitted from the subscriber is session admission control, the request flow is preferentially transferred to the service edge using the bandwidth of the EF class. system. An access network that bundles a plurality of subscriber terminals using a VLAN, a bandwidth management control device that manages and controls the bandwidth of the communication path of the access network via a service edge, and from the service edge to the edge router In a bandwidth management control method comprising a core network for static routing,
By the bandwidth management control device,
Each physical communication path between at least three nodes constituting the access network is defined as a first virtual path and a second virtual path, and managed and stored in association with each upper limit band in each communication path. A first step of managing and storing in the means;
When a request flow is transmitted from a subscriber, the request for the first virtual path and the second virtual path through which the request flow passes does not exceed the upper limit bandwidth read from the management storage unit. A second step of determining whether the bandwidth of the flow can be stacked, and securing the bandwidth of the request flow when the stacking is possible for all of the first virtual path and the second virtual path and, the possess,
The first step includes
The bandwidth of the first virtual path is managed by using a management QoS class composed of a low-delay and low-loss EF class bandwidth, an AF class bandwidth that allows delay, and a best-effort BE class bandwidth. And
The second step includes
When a bandwidth value obtained by subtracting the BE class bandwidth and the IP broadcast bandwidth from the upper limit bandwidth of the communication path is managed for the downstream bandwidth of the first virtual path, and the IP broadcast bandwidth is required A bandwidth management control method for securing a bandwidth for the IP broadcast by reducing the bandwidth of the AF class and not changing the bandwidth of the EF class . The first step includes
The management QoS class bandwidth can be managed by dividing it into a plurality of management service classes according to the service type, and the management service class bandwidth can be managed in association with a plurality of reception priority thresholds according to the reception priority. Because
A third step of analyzing a QoS class, a service type, and a reception priority from the request flow transmitted from the subscriber;
The second step includes
In the management QoS class corresponding to the analyzed QoS class, it is determined whether the request flow can be stacked, and the request flow can be stacked in the management service class corresponding to the analyzed service type. If the request flow can be stacked within a range that does not exceed the reception priority threshold corresponding to the analyzed reception priority, and can be stacked in all determinations The bandwidth management control method according to claim 7, wherein a bandwidth of the request flow is secured. The first step includes
The bandwidth of the second virtual path can be managed in association with a plurality of service thresholds according to the service type,
A third step of analyzing a service type from the request flow transmitted from the subscriber;
The second step includes
Determining whether the request flows can be stacked within a range not exceeding the service threshold corresponding to the analyzed service type, and securing the bandwidth of the request flows when the determination is possible in the determination. The bandwidth management control method according to claim 7 or 8, wherein: The first step includes
The first virtual path and the second virtual path can be managed using different virtual paths in the uplink direction and the downlink direction,
The second step includes
10. The bandwidth of the first virtual path and the bandwidth of the second virtual path in the uplink direction and the downlink direction can be dynamically changed. Bandwidth management control method.

Images