JP5075950B2 - Resource management control device and operation method thereof - Google Patents

Description

  The present invention relates to a resource management control device and an operation method thereof.

  In ITU-T (International Telecommunication Union Telecommunication Standardization Division; International Telecommunication Union-Telecommunication Standardization Sector) and TTC (Information and Communication Technology Committee), standardization of functions of next generation networks (NGN) is being promoted. The functions include those related to a resource management method for providing communication with ensured quality.

[Overview of resource management in NGN]
In order to guarantee the communication quality on the network for various services such as terrestrial digital broadcast retransmission, telephone, and video on demand (VOD), NGN performs band control by session initiation protocol (hereinafter referred to as SIP) session control. Is possible.

  As shown in FIG. 3, the NGN transfer network 2 includes an access network composed of optical fibers and transmission devices for distributing them to the home, and a core network composed of a large-capacity router.

  A user network including home terminals 3 and routers is accommodated in a Core Border Gateway Function device (hereinafter referred to as a CBGF device) 21 via a Home Gateway device (hereinafter referred to as an HGW device) 4 and an access network. The CBGF apparatus 21 is controlled by a Resource and Admission Control Subsystem apparatus (hereinafter referred to as a resource management control apparatus) 1A. A Call Session Control Function device (hereinafter referred to as a CSCF device) 5 performs session control by SIP and notifies media information to the resource management control device 1A. A subscriber information management device (Network Attachment Subsystem) 6 performs IP address assignment and authentication by DHCP (Dynamic Host Configuration Protocol), and the subscriber information management device 6 includes a CSCF device 5 and a resource management control device. The subscriber information is notified to 1A. In NGN, these devices perform processing in cooperation with each request by a SIP session, so that NGN specific such as QoS (a technology that reserves a band for a specific communication and guarantees a constant communication speed) is used. Realize the function.

Japanese Patent Application No. 2005-40024

Masahiro Miyasaka, Noriaki Horime, Koji Kishida, "Bandwidth Management and Control Technology in NGN", NTT Technical Journal, vol. 20, no. 10, pp. 22-23, Oct 2008 Osamu Kamatani, Kenta Kawakami, Satoshi Yamamoto, “Standardization Trend of Quality Control Functions in Next Generation Networks”, NTT Technical Journal, vol. 20, no. 10, pp. 44-47, Oct 2008

  As a conventional bandwidth management technique in an IP network, in FIG. 3, the resource management control device 1A abstracts the upper limit bandwidth between network devices as a virtual path based on the physical configuration of the transfer network 2. And a technology for determining whether or not the bandwidth requested at the time of session establishment by SIP can be secured on this virtual path (Patent Document 1, Non-Patent Document 1).

  When providing communication with quality ensured in an IP network, when establishing a session by SIP, it is necessary to have a technology for determining whether or not the communication bandwidth requested by SDP (Session Description Protocol) can be secured in the access network. Become.

  In FIG. 3, upon receiving the session establishment request message (INVITE), the CSCF device 5 determines the requested bandwidth and quality class from the media information in the SDP information stored in the message, and determines the media address, port. The information is notified to the resource management control device 1A together with the information. The resource management control device 1A identifies the communication path used by the user's communication from the access network configuration data provided as the configuration information, and secures the bandwidth necessary for communication in the virtual path set on the communication path. Determine if you can. When the bandwidth can be secured in all the virtual paths, the session establishment request is accepted and the bandwidth is reserved.

  However, in a network device (such as a router), there is a limit to the packet transfer capability that can be transferred per unit time, and when traffic exceeding the packet transfer capability of the network device flows in, the bandwidth between the network devices can be secured. However, communication quality may not be guaranteed. That is, when the acceptance determination is made only by the band control, there is a possibility that quality degradation during communication may occur. In addition, the number of ports of the network device is limited, and the number of media that can be connected simultaneously is also limited. Therefore, when the resource management control device performs acceptance determination, it is necessary to expand the technology so that the packet transfer capability and the maximum number of media, that is, the amount of resources are also taken into consideration.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a resource that can prevent the amount of resources reserved in the network device from becoming larger than the amount of resources that can be reserved in the network device. An object of the present invention is to provide a management control device and an operation method thereof.

In order to solve the above problems, a first aspect of the present invention is a resource management control device that manages resources of a transfer network including a network device, and stores the amount of resources that can be reserved by the network device as a virtual path Based on the content of the request relating to the reservation of the network device, the virtual path, and the amount of the reserved resource. Means for determining whether or not to respond to the request, and the content of the request indicates a packetization period of a packet that newly flows through the network device when the request is approved, The number of packets per unit time that can be reserved is at least the virtual path, and the newly flowing single unit is based on the period. The number of packets per time is obtained, and the request is determined based on the number, the number of packets per unit time that can be reserved by the network device, and the number of packets per unit time that are reserved by the network device. you determine whether or not to accept.
A second aspect of the present invention is a resource management control device for managing resources of a transfer network including a network device, the storage device storing an amount of resources that can be reserved in the network device as a virtual path, and a reservation in the network device Means for storing the amount of the reserved resource, and means for determining whether or not to respond to the request based on the content of the request regarding reservation of the network device, the virtual path, and the amount of the reserved resource The content of the request indicates a bandwidth of communication newly performed when the request is approved, and at least the number of packets per unit time that can be reserved in the network device is the virtual path. And determining the number of packets per unit time newly flowing through the network device based on the bandwidth, Based on the number of packets per unit are reserved time in a few and the network device of a packet per available unit time reservation Ttowaku device determines whether or not to accept the request.
A third aspect of the present invention is a resource management control device for managing resources of a transfer network including a network device, the means for storing the amount of resources that can be reserved in the network device as a virtual path, and a reservation in the network device Means for storing the amount of the reserved resource, and means for determining whether or not to respond to the request based on the content of the request regarding reservation of the network device, the virtual path, and the amount of the reserved resource The content of the request indicates the number of media newly reserved in the network device when the request is approved, and the number of media that can be reserved in the network device is at least the virtual number. The number of media, the number of media that can be reserved in the network device, and the network device. Based on the number of Yakusa is to have media, determines whether or not to accept the request.

A fourth aspect of the present invention is an operation method of a resource management control device that manages resources of a transfer network including a network device, wherein the resource management control device uses an amount of resources that can be reserved by the network device as a virtual path. Means for storing, and means for storing the amount of resources reserved in the network device, wherein the resource management control device includes: a content of a request related to reservation of the network device; and the virtual path. And determining whether to respond to the request based on the amount of the reserved resource, and the content of the request includes a packet newly flowing through the network device when the request is approved. Indicates the packetization cycle, and the number of packets per unit time that can be reserved by the network device is reduced. At least the virtual path, the number of packets per unit time newly flowing based on the period is obtained, and the number, the number of packets per unit time that can be reserved by the network device, and the network device are reserved. and based on the number of packets per unit time is, it determine whether or not to accept the request.
A fifth aspect of the present invention is an operation method of a resource management control device for managing resources of a transfer network including a network device, wherein the resource management control device uses the amount of resources that can be reserved in the network device as a virtual path. Means for storing, and means for storing the amount of resources reserved in the network device, wherein the resource management control device includes: a content of a request related to reservation of the network device; and the virtual path. It is determined whether or not to respond to the request based on the amount of the reserved resource, and the content of the request indicates a bandwidth of communication newly performed when the request is approved The number of packets per unit time that can be reserved by the network device is at least the virtual path, and the bandwidth is To determine the number of packets per unit time newly flowing through the network device, the number of packets per unit time that can be reserved in the network device, and the number of packets per unit time reserved in the network device. Whether or not to respond to the request is determined based on the number.
A sixth aspect of the present invention is an operation method of a resource management control device that manages resources of a transfer network including a network device, wherein the resource management control device uses the amount of resources that can be reserved in the network device as a virtual path. Means for storing, and means for storing the amount of resources reserved in the network device, wherein the resource management control device includes: a content of a request related to reservation of the network device; and the virtual path. And determining whether or not to respond to the request based on the amount of the reserved resource, and the content of the request is newly reserved in the network device when the request is approved. The number of media, and the number of media that can be reserved in the network device as at least the virtual path, Serial based on the number of media that are reserved by the number and the network device that can be booked media number and the network device of the media, judges whether or not to accept the request.

  According to the present invention, the amount of resources reserved in the network device can be prevented from becoming larger than the amount of resources that can be reserved in the network device, and communication quality in the network device can be prevented from deteriorating in advance. Can improve the quality.

It is a block diagram of the communication system containing the resource management control apparatus which concerns on this Embodiment. It is a schematic diagram shown about the determination which the resource management control apparatus of FIG. 1 performs. It is a figure which shows the outline | summary of the resource management in NGN (next generation network).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a communication system including a resource management control device according to the present embodiment.

  A Resource and Admission Control Subsystem device (hereinafter referred to as a resource management control device) 1 is a device for managing resources provided in an NGN (next-generation network) transfer network 2 and capable of communicating with the transfer network 2. It has become. Although not shown, the transfer network 2 includes an access network composed of optical fibers and transmission devices for distributing them to the home, and a core network composed of a large-capacity router. Here, the transfer network 2 includes a Core Border Gateway Function device (hereinafter referred to as a CBGF device) 21. The transfer network 2 includes a plurality of network devices (hereinafter simply referred to as network devices) such as the transmission device and router, and a plurality of physical links (hereinafter referred to as paths) that connect the network devices.

  A user network including home terminals 3 and routers (not shown) is accommodated in the CBGF device 21 via a home gateway device (hereinafter referred to as an HGW device) 4 and an access network (not shown).

  The resource management control device 1 can communicate with a Call Session Control Function device (hereinafter referred to as a CSCF device) 5 and a subscriber information management device (Network Attachment Subsystem) 6 that perform session control using the Session Initiation Protocol. ing. The resource management control device 1 and the CSCF device 5 store the subscriber information notified from the subscriber information management device 6. The subscriber information management device 6 performs IP address assignment, authentication, and the like using DHCP (Dynamic Host Configuration Protocol).

  The subscriber information includes the IP address, the upper limit of the access line bandwidth, and the like. Further, in the resource management control device 1, a physical configuration of a network device (router or the like) and an upper limit bandwidth of each path are set as a configuration. That is, the resource management control device 1 stores a bandwidth (upper limit bandwidth) that can be reserved in each path as a virtual path.

  Further, the resource management control device 1 stores a bandwidth reserved for each path.

  Further, the resource management control device 1 stores the amount of resources that can be reserved in each network device as a virtual path. Specifically, the resource management control device 1 virtually determines the number of ports that can be reserved in each network device, the number of packets per unit time that can be reserved in each network device, and the number of media that can be reserved in each network device. Remember as a pass.

  Further, the resource management control device 1 stores the amount of resources reserved in each network device. Specifically, the resource management control device 1 determines the number of ports reserved in each network device, the number of packets per unit time reserved in each network device, and the number of media reserved in each network device. I remember the number.

(Operation of this embodiment)
When there is a call from the terminal 3 in the home, a session establishment request message INVITE is transmitted to the CSCF device 5 via the HGW device 4.

  The CSCF device 5 transmits the media information in the session establishment request message INVITE to the resource management control device 1.

  In other words, the session establishment request message INVITE includes SDP (Session Description Protocol) information used for negotiating communication contents to be established, and the SDP information includes the type of media (audio, video, etc.) and codec. Media information such as type, IP address and port number used for communication, and bandwidth is described. The CSCF device 5 transmits the media information to the resource management control device 1.

  As shown in FIG. 2, the resource management control device 1 first makes the following determination for each path.

  The resource management control device 1 sums up (accumulates) the bandwidth reserved in the path and the bandwidth described in the media information (bands to be used in the future) (symbols a to e in the figure). It is determined whether the bandwidth is less than the reservable bandwidth.

  Here, if the total is larger than the virtual path in at least one path, the resource management control device 1 notifies the CSCF device 5 that the session establishment request message INVITE cannot be accepted (NG), and the CSCF device 5 A similar notification is sent to the device 4.

  On the other hand, if the total is less than or equal to the virtual path in all paths, the resource management control device 1 makes the following determination regarding each network device.

The resource management control device 1 sums (stacks) the number of ports reserved in the network device and the number of ports described in the media information (the number of ports to be used from now on) (symbols a1 to e1 in the figure). , It is determined whether the total is equal to or less than the number of virtual paths, that is, the number of ports that can be reserved in the network device.

  Here, if the total is larger than the virtual path in at least one network device, the resource management control device 1 notifies the CSCF device 5 that the session establishment request message INVITE cannot be accepted (NG), and the CSCF device 5 The same notification is sent to the HGW apparatus 4.

  On the other hand, if the total is less than or equal to the virtual path in all network devices, the resource management control device 1 makes the following determination for each network device as shown in FIG.

  For example, if the media information indicates the packetization cycle of a packet that newly flows through each network device in the communication to be performed, the resource management control device 1 determines the unit in the communication to be performed based on the cycle. Find the number of packets that flow per hour. Specifically, in the case of voice communication, for example, the cycle is described as 20 msec in the a = ptime line (packetization cycle) of the media information. In this case, the number of packets flowing per second (unit time) = 1 [ Packet] ÷ 0.02 [sec] = 50 [packets / sec].

  For example, if the media information indicates the bandwidth of the communication to be performed, the resource management control device 1 obtains the number of packets flowing to the network device per unit time in the communication to be performed based on the bandwidth. . Specifically, in the case of video communication or data communication, for example, the bandwidth is described as 1000 kbps (125000 bytes / sec) in line b, and the resource management control device 1 is based on the maximum length of a general packet length stored in advance. Further, the packet length of the communication to be performed is determined to be 1500 [byte / packet], and the number of packets flowing per second in the communication = 12.55000 [byte / sec] ÷ 1500 [byte / packet] = 83.3 [ Packet / sec].

  Note that if the number of packets that flow per unit time is already described in the media information, the resource management control device 1 can also use the number of packets in the following determination.

  The resource management control device 1 newly reserves the number of packets per unit time reserved in the network device (the value calculated as described above or the value described in the media information) (in the figure, reference symbols a2 to a2). e2) are summed (stacked), and it is determined whether the sum is equal to or less than the number of packets per unit time that can be reserved in the virtual path, that is, the network device.

  Here, if the total is larger than the virtual path in at least one network device, the resource management control device 1 notifies the CSCF device 5 that the session establishment request message INVITE cannot be accepted (NG), and the CSCF device 5 The same notification is sent to the HGW apparatus 4.

  On the other hand, if the total is less than or equal to the virtual path in all network devices, the resource management control device 1 makes the following determination for each network device as shown in FIG.

  The resource management control device 1 sums (stacks) the number of media reserved in the network device and the number of media described in the media information (the number of media to be used from now on) (reference symbols a3 to e3 in the figure). , It is determined whether the total is equal to or less than the number of virtual paths, that is, the number of media that can be reserved in the network device. For example, the number of media in the media information can be calculated by summing up the number of media descriptions in the media information.

  Here, if the total is larger than the virtual path in at least one path, the resource management control device 1 notifies the CSCF device 5 that the session establishment request message INVITE cannot be accepted (NG), and the CSCF device 5 A similar notification is sent to the device 4.

  On the other hand, if the total is less than or equal to the virtual path in all paths, the resource management control device 1 controls the CSCF device 5, that is, accepts the request for the session establishment request message INVITE and executes communication. Further, the resource management control device 1 stores the amount of resources that are accumulated and calculated as the amount of reserved resources.

  Further, when the requested communication is no longer necessary, the resource management control device 1 subtracts the amount of the resource reserved for the communication and stores the amount of the resource after the subtraction as the amount of the reserved resource. To do.

  In the present embodiment, the number of ports that can be reserved by the network device, the number of packets per unit time that can be reserved by the network device, and the number of media that can be reserved by the network device are each a virtual path. At least one of these may be a virtual path.

  Therefore, according to the present embodiment, the resource management control device 1 not only determines the bandwidth, that is, not only determines whether the bandwidth reserved by the path is equal to or less than the bandwidth that can be reserved by the path. The function (means) for storing the amount of resources that can be reserved in the network as a virtual path, the function (means) for storing the amount of resources reserved in the network device, the content of the request for reservation of the network device, and the virtual path And a function (means) for determining whether or not to respond to the request based on the reserved resource amount, and the resource that can be reserved in the network device is a resource that can be reserved in the network device If it is larger than the amount of the request, the request may be rejected. Therefore, the request is executed and the communication quality deteriorates in the network device. From preventing in advance, it is possible to improve the quality of communication.

  In addition, each of one or more of the number of ports that can be reserved by the network device, the number of packets per unit time that can be reserved by the network device, and the number of media that can be reserved by the network device is defined as a virtual path. It is possible to prevent the amount of this kind of resource from becoming larger than the amount of resources that can be reserved by the network device, and improve the quality of communication.

  Further, the content of the request indicates a packetization period of a packet that newly flows through the network device when the request is approved, and the resource management control device 1 has a unit per unit time that can be reserved by the network device. The number of packets is at least a virtual path, the number of packets per unit time newly flowing through the network device is obtained based on the period, the number, the number of packets per unit time that can be reserved in the network device, and the network device Because it is determined whether or not to respond to the request based on the number of packets per unit time reserved in step 1, the content of the request may not directly include the number of packets per unit time.

  The content of the request indicates a bandwidth of communication newly performed when the request is approved, and the resource management control device 1 sets at least the number of packets per unit time that can be reserved by the network device. The number of packets per unit time newly flowing through the network device based on the bandwidth is obtained as a virtual path, and the number, the number of packets per unit time that can be reserved by the network device, and the network device are reserved. Since whether or not to respond to the request is determined based on the number of packets per unit time, the content of the request may not directly include the number of packets per unit time.

  The content of the request indicates the number of media newly reserved in the network device when the request is approved, and the resource management control device 1 sets at least the number of media that can be reserved in the network device. Since it is a virtual path, it is determined whether or not to respond to the request based on the number of media, the number of media that can be reserved in the network device, and the number of media that are reserved in the network device. Can be prevented from exceeding the number of media that can be reserved by the network device, and the communication quality can be improved.

  The computer program for causing the computer to function as the resource management control device 1 according to the present embodiment can be recorded on a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, or a magnetic tape, Further, it can be widely distributed by being transmitted via a communication network such as the Internet.

DESCRIPTION OF SYMBOLS 1 ... Resource management control apparatus 2 ... Transfer network 3 ... Terminal 4 ... HGW apparatus 5 ... CSCF apparatus 6 ... Subscriber information management apparatus

Claims (6)

A resource management control device for managing resources of a transfer network including a network device,
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing an amount of resources reserved in the network device;
Means for determining whether or not to respond to the request based on the content of the request for reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates a packetization period of a packet that newly flows through the network device when the request is approved,
The number of packets per unit time that can be reserved in the network device is set as at least the virtual path, the number of packets that flow newly per unit time is obtained based on the period, and the number can be reserved in the network device based on the number of packets per unit are reserved time in a few and the network device of a packet per unit time, the resource management control apparatus characterized by you determine whether or not to accept the request. A resource management control device for managing resources of a transfer network including a network device,
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing an amount of resources reserved in the network device;
Means for determining whether or not to respond to the request based on the content of the request for reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates a bandwidth of communication newly performed when the request is approved,
The number of packets per unit time that can be reserved in the network device is set as at least the virtual path, and the number of packets per unit time that newly flows through the network device based on the bandwidth is obtained. based on the number of packets per unit are reserved time in a few and the network device of a packet per available unit reserved time, resource management control, wherein you determine whether or not to accept the request apparatus. A resource management control device for managing resources of a transfer network including a network device,
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing an amount of resources reserved in the network device;
Means for determining whether or not to respond to the request based on the content of the request for reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates the number of media newly reserved in the network device when the request is granted,
The number of media that can be reserved in the network device is at least the virtual path, and based on the number of media, the number of media that can be reserved in the network device, and the number of media that are reserved in the network device, resource management control apparatus characterized by you determine whether or not to accept the request. An operation method of a resource management control device for managing resources of a transfer network including a network device,
The resource management control device includes:
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing the amount of resources reserved in the network device,
The operation method is as follows:
The resource management control device determines whether to respond to the request based on the content of the request related to the reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates a packetization period of a packet that newly flows through the network device when the request is approved,
The number of packets per unit time that can be reserved in the network device is set as at least the virtual path, the number of packets that flow newly per unit time is obtained based on the period, and the number can be reserved in the network device based on the number of packets per unit time that is reserved by the number and the network device of a packet per unit time, the operation of the resource management control apparatus characterized by you determine whether or not to accept the request Method. An operation method of a resource management control device for managing resources of a transfer network including a network device,
The resource management control device includes:
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing the amount of resources reserved in the network device,
The operation method is as follows:
The resource management control device determines whether to respond to the request based on the content of the request related to the reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates a bandwidth of communication newly performed when the request is approved,
The number of packets per unit time that can be reserved in the network device is set as at least the virtual path, and the number of packets per unit time that newly flows through the network device based on the bandwidth is obtained. based on the number of packets per unit are reserved time in a few and the network device of a packet per available unit reserved time, resource management control, wherein you determine whether or not to accept the request How the device works. An operation method of a resource management control device for managing resources of a transfer network including a network device,
The resource management control device includes:
Means for storing the amount of resources that can be reserved in the network device as a virtual path;
Means for storing the amount of resources reserved in the network device,
The operation method is as follows:
The resource management control device determines whether to respond to the request based on the content of the request related to the reservation of the network device, the virtual path, and the amount of the reserved resource ,
The content of the request indicates the number of media newly reserved in the network device when the request is granted,
The number of media that can be reserved in the network device is at least the virtual path, and based on the number of media, the number of media that can be reserved in the network device, and the number of media that are reserved in the network device, operating a resource management control apparatus characterized by you determine whether or not to accept the request.

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