KR101107323B1 - Apparatus and method for controlling resource approval in Packet-Optic convergence network - Google Patents

Abstract

The present invention relates to a resource admission control system in a packet-optical integrated network and a method of operating the system, the system being provided with PTL (Packet Transport Layer) path information from a path management system, the PTL formed in the packet-optical integrated network A network resource management unit for acquiring and notifying resource availability for each PTL path after identifying paths, and analyzing resource usage status of each PTL path to dynamically change the resource allocation for each PTL path; A policy determination unit which receives and stores a local policy in advance and determines whether to approve a service session resource reservation, change, or release request based on the local policy and availability of resources per PTL path; And a resource statistic collecting unit for collecting and providing a traffic amount for each PTL path to obtain a resource usage status for each PTL path and providing the resource resource to the network resource manager, wherein the network resource manager includes a PTL path with less resource allocation to resource usage. Increase the resource quota for PTL paths, decrease the resource quota for PTL paths with more resource quotas, delete PTL paths whose resource usage falls below the lower limit, and PTL paths whose resource usage exceeds the upper limit. By configuring additional settings, it is possible to more reliably provide quality guaranteed IP premium service.

Packet-to-optical network, resource reservation approval, resource change, PTL path, PTL path, IP premium service

Description

Resource admission control system and its operation method in packet-optical converged network {Apparatus and method for controlling resource approval in Packet-Optic convergence network}

The present invention relates to a path and resource control technology in a packet-optical integrated network, and more particularly, to a resource admission control system and a method of operating the same in a packet-optic integrated network that can more stably provide a quality guaranteed IP premium service. It is about.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 22008-S-010-01, Task name: Multi-layer optical network control platform technology Development].

Packet-optical integrated network is a network composed of Enhanced Packet-Optical Integrated Network Transport Switch (E-POTS), which is a packet-optical integrated switch, and refers to a next-generation transport network including transmission layers 0 to 4.

At this time, E-POTS uses PTL (Packet Transport Layer) tunneling technology for 1.5-layer transmission. PTL technology is similar to the L2 tunneling technology of PBB-TE or MPLS-PE, but it does not simply load IP packets in a tunnel but identifies service session flows and carries only IP premium service traffic on the PTL path.

The network operator sets up the optical paths of the 0-layer and 1-layer transmissions between the E-POTSs, and then sets the PTL path thereon.

The PTL path is a logical path that divides and defines bandwidth resources of an optical path, and is a path established between edge-edge devices of a packet-optical integrated network. The PTL path guarantees the transmission quality of IP premium service traffic, and may be configured and operated in multiple services for the same edge-edge interval.

Since IP premium services require various transmission qualities according to types, by setting individual PTL paths that satisfy the corresponding transmission qualities, various service session flows can be carried on an appropriate PTL path.

However, in the related art, a technique for controlling a path and resources for guaranteeing transmission quality of IP premium service traffic has not been proposed yet.

Meanwhile, next generation networks (NGNs) or broadband communications networks (BcNs) provide dynamic resource approval control based on the ITU-T RACF (Resource Access Control Facility) standard.

The RACF system determines whether to use resources for IP service sessions based on network paths and resources pre-assigned by a network management station (NMS) or provisioning server, and can guarantee the transmission quality of service session traffic. If there is not enough resources in the path, it will refuse to reserve resources for the service session.

As the number of resource reservation rejections for a specific path resource increases, it is difficult to provide a smooth service. Therefore, the network operator should always grasp the resource usage of the path and take appropriate measures.

That is, the RACF system developed so far determines whether to approve or reject the use of a resource reservation request for a service session within the limit of path resources set by the network operator through a separate path setting system.

Therefore, in the RACF system according to the prior art, it is impossible to automatically change the path resource after it is allocated, and it is inconvenient for the network operator to change the path resource manually by grasping the resource usage situation.

In addition, the conventional RACF system determines whether to approve or reject a resource reservation request based only on resource availability for each PTL path, so that the local policy set in the packet-optical integrated network cannot be reflected in the resource reservation approval operation at all. There was also.

Therefore, in the present invention, it is possible to automatically control the PTL path and PTL path resource allocation without the intervention of the network operator, packet-optical integration to ensure the transmission quality of IP premium service traffic in the packet-optical converged network stably A resource admission control system in a network and a method of operating the same are provided.

In addition, it is possible to increase the accuracy and reliability of resource reservation approval by determining whether to approve a resource reservation request by reflecting not only the resource availability per PTL path but also the local policy set in the packet-optical integrated network. A resource admission control system and a method of operating the same in a packet-optical integrated network are provided.

According to a first aspect of the present invention, as a means for solving the above problems, the resource admission control system in a packet-optical integrated network is provided with packet transport layer (PTL) path information from a path management system, the packet- A network resource management unit for determining PTL paths formed in the optical convergence network, acquiring and notifying whether or not resource availability is available for each PTL path, and analyzing resource usage status for each PTL path to dynamically change the resource allocation for each PTL path; A policy determination unit which receives and stores a local policy in advance and determines whether to approve a service session resource reservation, change, or release request based on the local policy and availability of resources per PTL path; And a resource statistic collecting unit for collecting and statistically calculating the traffic volume for each PTL path to obtain a resource usage status for each PTL path and provide it to the network resource manager.

The network resource management unit increases the resource allocation for the PTL path with less resource allocation to the resource usage, reduces the resource allocation for the PTL path with more resource allocation compared to the resource usage, and the PTL path whose resource usage falls short of the lower limit. The PTL path whose resource usage exceeds the upper limit of use is additionally set.

The network resource management unit may further include a function of receiving a PTL path not available from the path management system and delivering the PTL path to the policy determination unit.

The policy decision unit may further include a function of identifying a service session affected by the PTL path that is not available for resources and notifying the service control system.

The policy decision unit may include a function of controlling an operation of an enhanced packet-optical integrated network transport switch (E-POTS) so that a transmission quality of service session traffic may be guaranteed.

The apparatus may further include a database storing information on a PTL path list, a service session list, a local policy, resource availability per PTK path, and resource usage status for each PTL path.

According to a second aspect of the present invention, as a means for solving the above problems, the operation method of the resource admission control system provided in the packet-optical integrated network, all PTL (Packet Transport) formed in the packet-optical integrated network Identifying a layer path; Periodically monitoring the operational status of each of the PTL paths to determine whether resources of each of the PTL paths are available and resource usage; Dynamically changing a resource allocation amount for each PTL path according to the resource usage status; And when a service session resource reservation, change or release request is input, determining whether to approve the service session resource reservation, change or release request based on resource availability of each of the PTL paths and a local policy.

Dynamically changing the resource allocation for each PTL path may include increasing a resource allocation for a PTL path having a smaller resource allocation than a resource usage, reducing a resource allocation for a PTL path having a larger resource allocation than a resource usage, The PTL path that falls below the lower limit of use is deleted, and the PTL path whose resource usage exceeds the upper limit of use is additionally set.

The method may further include identifying and notifying a service session affected by the PTL path that is not available when the PTL path is not available.

As such, the resource admission control system in the packet-optical integrated network of the present invention periodically monitors resource usage for all PTL paths without intervention of the network operator, and automatically assigns the PTL path and the PTL path according to the monitoring result. To control resources that have been allocated. This enables consistent quality guaranteed IP premium service traffic transmission without delay or interruption of service due to path resource change.

In addition, after receiving and setting the local policy from the network operator, it is possible to determine whether to approve or reject the resource reservation request by reflecting the local policy as well as the availability of resources for each PTL path. It allows for greater reliability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification.

Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

1 is a schematic diagram of a packet-optical integrated network according to an embodiment of the present invention.

Referring to Fig. 1, the packet-optical integrated network resource control apparatus of the present invention is composed of an E-POTS 10, a path management system 20, a resource approval control system 30, and a service control system 40. .

The E-POTS 10 is an edge device constituting the packet-optical integrated network. The E-POTS 10 additionally sets a PTL path in addition to the optical paths of the transmission layer 0 and layer 1, and guarantees transmission quality of IP premium service traffic through the PTL path. Do it.

The path management system 20 sets, maintains, and deletes the optical path and the PTL path between the E-POTSs 10, and allocates resources such as bandwidth to all paths. In addition, in response to a resource change request of the resource approval control system 30, a specific PTL path may be additionally set or deleted, or a resource allocated to a specific PTL path may be increased or decreased. In addition, when a resource fails to be available due to a failure in a specific PTL path, information about this is notified to the resource admission control system 30.

The resource approval control system 30 receives and stores a local policy set by the network operator in advance, and receives PTL path information from the path management system 20 to identify PTL paths formed in the packet-optical integrated network. It periodically monitors resource availability for each PTL path and determines whether to approve or reject a resource reservation request based on local policy and resource availability for each PTL path.

In this case, information on IP ranges that can be approved for resource reservation, a list of PTL paths allowed or prohibited for resource allocation, etc. is set in the local policy, and the edge-edge equipment location for each PTL path, path bandwidth, and path are included in PTL path information. IP subnet address assigned to.

In addition, the resource usage status of each PTL path is periodically monitored, and the path management system 20 is controlled according to the monitoring result to change resources allocated to the PTL path or to add or delete the PTL path.

The service control system 40 is implemented with 3GPP IMS (IP Multimedia Subsystem) and the like, and performs resource reservation, change, and release request operations for providing service sessions such as IPTV, VoIP, and VoD.

2 is a diagram showing the detailed configuration of the resource approval control system 30 according to an embodiment of the present invention.

2, the resource approval control system 30 of the present invention is a network resource management unit 31, policy determination unit 32, resource statistics collecting unit 33, path DB (DataBase) 34, policy DB 35, and a statistics DB 36.

Hereinafter, the function of each component will be described.

The network resource manager 31 receives the PTL path information through the path management system 20 to identify all the PTL paths formed in the packet-optical integrated network, and then periodically monitors the availability of resources of each PTL path. And if the path management system 20 is notified of the PTL path that is not available resources, it is delivered to the policy decision unit 32 so that the policy decision unit 32 can take appropriate measures accordingly.

In addition, the network resource management unit 31 dynamically monitors and analyzes the resource usage status for each PTL path, and dynamically changes the resource allocation for each PTL path through the path management system 20 to optimize the network usage environment. For example, increase the resource quota for PTL paths that have less resource allocation to resource usage, decrease the resource quota for PTL paths that have more resource quotas for resource usage, and delete PTL paths whose resource usage falls below the lower limit. PTL paths whose resource usage exceeds the upper limit of usage are set up additionally.

At this time, the resource quota change condition, such as the lower limit of use and the upper limit of use may be actively set and changed by the network operator.

The policy decision unit 32 stores and manages a local policy, and when a resource reservation request, a change, or a release request for a service session is input, the policy decision unit 32 determines whether resources are available for each PTL path by the local policy and the network resource operation unit 31. It determines whether to approve a resource reservation, change or release request. In addition, by controlling the operation of the E-POTS 10 according to the approval result, it is possible to guarantee transmission quality of resource reservation or changed service session traffic.

When the policy decision unit 32 is notified of a PTL path that is unavailable due to a failure from the network resource management unit 31, the policy decision unit 32 searches a list of service sessions stored in the policy DB 35 to affect the service session affected by the PTL path. And the service control system 40 is informed.

The resource statistics collecting unit 33 collects traffic statistics of each PTL path through the E-POTS 10 and stores the traffic statistics in the statistics DB 36. In addition to the traffic volume for each PTL path, the number of resource reservation requests and approval and rejection rates provided from the policy decision unit 32 are stored in the statistics DB 36. This is to allow the network resource management unit 31 to grasp the resource usage status of each PTL path by considering not only the traffic statistics of each PTL path but also the number of resource reservation requests and the approval and rejection rates.

The path DB 34 stores PTL path information and information on resource availability for each PTL path, and the policy DB 35 stores information on a local policy, a service session list, a failed PLT path, and the like. 36) stores information about traffic statistics, resource reservation requests, resource reservation approvals, and resource reservation rejection rates of each PTL path.

3 is a view for explaining a resource admission control method according to an embodiment of the present invention.

First, the policy decision unit 32 receives information on a local policy defined by the network operator (S1), and the network resource manager 31 analyzes the PTL path information provided from the path management system 20, Identify all PTL paths formed in the packet-optical integrated network (S2).

In this state, the network resource manager 31 periodically monitors resource availability and resource usage of each PTL path (S3).

The network resource manager 31 dynamically performs a resource quota change operation according to the resource usage status of each PTL path identified through step S3 (S4). In other words, increase the resource allocation for PTL paths with less resource allocation to resource usage, decrease the resource allocation for PTL paths with more resource allocation than resource usage, delete PTL paths whose resource usage falls below the lower limit. PTL paths whose resource usage exceeds the upper limit of usage are additionally set.

When a resource reservation, change, or release request is input from the service control system 40 (S5), the policy determination unit 32 determines whether the local policy set through step S1 and the resource availability for each PTL path acquired through step S3 are available. It determines whether to approve a resource reservation, change or release request, informs the service control system 40 of the approval, and simultaneously controls the E-POTS 10 to ensure transmission quality of service session traffic (S6). ).

When the path management system 20 detects a failure occurring in a specific PTL path and notifies that the resource of the corresponding PTL path is not available (S7), the policy decision unit 32 sends a service session affected by the PTL path. After grasping, the service control system 40 is notified to the service control system 40 so that the service control system 40 can take appropriate measures (S8).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a schematic diagram of a packet-optical integrated network according to an embodiment of the present invention.

2 is a diagram showing a detailed configuration of a resource approval control system according to an embodiment of the present invention.

3 is a view for explaining a resource admission control method according to an embodiment of the present invention.

Claims (9)

A resource admission control system in a packet-optical integrated network, After receiving PTL (Packet Transport Layer) path information from a path management system, grasping PTL paths formed in the packet-optical integrated network, acquiring and notifying the availability of resources for each PTL path, and analyzing the resource usage status of each PTL path A network resource manager to dynamically change the resource allocation for each PTL path; A policy determination unit which receives and stores a local policy in advance and determines whether to approve a service session resource reservation, change, or release request based on the local policy and availability of resources per PTL path; And Collecting and statistically calculating the traffic volume for each PTL path to obtain a resource usage status for each PTL path and providing the resource statistics collection unit to the network resource manager; The network resource management unit, Increase resource quotas for PTL paths with less resource quotas, reduce resource quotas for PTL paths with more resource quotas, delete PTL paths whose resource usage falls below the lower limit, and use resource resources. And a PTL path exceeding this upper limit of usage is additionally set. delete According to claim 1, wherein the network resource management unit And a function of receiving a PTL path not available from the path management system and delivering the PTL path to the policy decision unit. The method of claim 3, wherein the policy decision unit And a function of identifying a service session affected by the PTL path which is not available for resources and notifying a service control system. The method of claim 1, wherein the policy decision unit And a function of controlling the operation of an Enhanced Packet-Optical Integrated Network Transport Switch (E-POTS) to ensure transmission quality of service session traffic. The method of claim 1, Resource admission control system in a packet-optical integrated network further comprising a database storing information on PTL path list, service session list, local policy, resource availability by PTK path, and resource usage status by PTL path. . A method of operating a resource admission control system provided in a packet-optical integrated network, Identifying all packet transport layer (PTL) paths formed in the packet-optical integrated network; Periodically monitoring the operational status of each of the PTL paths to determine whether resources of each of the PTL paths are available and resource usage; Dynamically changing a resource allocation amount for each PTL path according to the resource usage status; And If a service session resource reservation, change or release request is input, determining whether to approve the service session resource reservation, change or release request based on resource availability of each of the PTL paths and a local policy; Dynamically changing the resource allocation for each PTL path Increase resource quotas for PTL paths with less resource quotas, reduce resource quotas for PTL paths with more resource quotas, delete PTL paths whose resource usage falls below the lower limit, and use resource resources. And a PTL path exceeding this upper limit of usage is additionally set. delete The method of claim 7, wherein And when notified of the PTL path that is not available for resources, identifying and notifying a service session affected by the PTL path that is not available.

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