KR100913601B1 - Call admission control method for the SIP base Service interworking Control System - Google Patents

Abstract

The present invention relates to a call admission control method for call interworking between SIP-based provider networks, comprising the steps of: a) receiving a call connection request message from a first provider network connected through a network; and b) when the call connection request message is input. Checking whether there is an available capacity of a resource required for call interworking with the first provider network; and c) outputting a resource allocation request message to a second network connected to the network if there is a resource available capacity as a result of the checking; If there is no capacity, ending the establishment of an interworking call session with the first provider network.

Description

Call admission control method for call interworking between SIP-based provider networks {Call admission control method for the SIP base Service interworking Control System}

The present invention relates to a call admission control method for call interworking between SIP-based provider networks.

The present invention is derived from research conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management No.:2006-S-058-02, Title: ALL-IP-based Integrated Network] Service Control Technology Development]

Recently, with the rapid development of mobile communication and the Internet, it is required to realize various multimedia services of high quality for mobile subscribers. The development of the Internet multimedia service has required a change from the existing circuit-based network to the packet-based network, and further the evolution of the IP-based network is in progress.

Currently, 3GPP is standardizing ALL IP based network reference model to provide IP based multimedia services. Here, the IP-based multimedia service refers to a service that can simultaneously provide various packet-based services based on the IP transport protocol to the mobile subscriber, which means that the subscriber can transfer files as well as real-time services such as voice and video. This means making it possible to simultaneously use non-real time services such as e-mail and short messages, or to use new services such as video phones, instant messaging, emergency calls and location information services.

Meanwhile, most of the functions for call interworking between SIP-based service provider networks are Proxy / B2BUA-based SIP interworking technology for session establishment, media interworking function through RTP media relay, SIP relay and SIP / H.323 conversion function, and Prefix. Routing function. However, the resources for the call interworking between the service provider networks are set after processing the called terminal and the SIP message without checking the possibility of providing the resources between the network or the network for call interworking between the service provider networks. Therefore, even when call interworking is not possible because there are no manganese or intra-network resources, there are problems in that unnecessary session establishment or transport transmission resources required for call interworking cannot be secured early.

The present invention has been proposed to solve the above-described problem, and an object of the present invention is to verify network transmission resources required for call interworking between different SIP-based service providers in advance before session establishment to minimize unnecessary session setup operations, The purpose of the present invention is to provide a call admission control method that can increase the completion rate of call interworking between network operators.

Another object of the present invention is to provide a call admission control method that can secure network transmission resources required for call interworking between different SIP-based provider networks before session establishment.

According to an aspect of the present invention, a call admission control method for call interworking between SIP-based service providers includes: a) receiving a call connection request message from a first service provider network connected to the network; b) if the call connection request message is input, checking whether there is an available capacity of a resource required for call interworking with the first provider network; and c) if there is a resource available capacity as a result of the check, to the second provider network connected to the network. Outputting a resource allocation request message and terminating the interworking call session establishment with the first provider network if there is no resource available capacity.

According to a further aspect of the present invention, step c) may further include step c-1) of processing network resource allocation if there is available capacity of a resource required for call interworking with the first provider network.

According to another aspect of the present invention, a call admission control method for call interworking between SIP-based service provider networks includes: d) receiving a response message including whether resource allocation is possible from a second service provider network connected to the network; and e) Outputting the interworking call session establishment request message to the second provider network if the resource allocation is possible as a result of confirming the response message; and ending the interworking call session establishment with the first provider network if the resource allocation is impossible.

According to the present invention, the SIP-based provider network is equipped with a call admission control device for call interworking between different SIP-based provider networks, so that the network transmission resources required for call interworking between different SIP-based provider networks can be checked in advance before session establishment. have. In this case, SIP-based service provider network is useful to terminate call early without additional session setup operation if there is no transmission resource for call interworking and to secure the resource in advance if there is resource. It works.

1 is a SIP-based provider core network system according to an embodiment of the present invention,

2 is a flowchart illustrating resource allocation between a SIP-based provider network according to an embodiment of the present invention;

3 is a flowchart illustrating resource allocation in a SIP-based provider core network according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 illustrates a SIP based operator core network system according to an embodiment of the present invention. As illustrated, the SIP-based provider core network system 100 according to the present embodiment includes a provider core network interworking controller 110, a resource allocation processor 130, and a call response controller 150.

The operator core network interworking control unit 110 processes a session setup for call interworking with a network connected to a first provider network and a second provider network when a call connection request message is input from a network connected to a first provider network. Manages session state information.

The resource allocation processing unit 130 allocates and provides a physical transmission resource. In one embodiment, the resource allocation processing unit 130 may be implemented to include a core network border gateway or an access network border gateway.

Core network border gateway is a network that handles the interaction for interworking between networks. The main function of core network border gateway provides the function to control and manage the transmission quality for each traffic to maintain the transmission quality. An access network border gateway is a network that processes interactions for interworking with an access network in a core network. The access network function not only assists an end user's network access, but also transfers information from various access points to the core network.

The call response controller 150 is connected between the operator core network interworking controller 110 and the resource allocation processor 130 to control operations of the operator core network interworking controller 110 and the resource allocation processor 130. In doing so, the ROM, RAM and peripherals can be implemented as an integrated microprocessor. As shown, in one embodiment, the call response control device 150 may be implemented including a call acceptance control unit 151 and a storage unit 153.

The storage unit 153 stores network resource information. For example, the network resource information may include network topology information, resource configuration information, and resource utilization status information. The storage unit 153 may be implemented as a hard disk driver, a flash memory, or the like.

The call admission control unit 151 reads network resource information from the storage unit 153 when the resource permission request message including resource information necessary for call connection processing is input from the operator core network interworking control unit 110, and then in the resource permission request message. Check that there is available capacity for the required resources.

In one embodiment, the call acceptance control unit 151 outputs a resource allowance failure message to the operator core network interworking control unit 110 if there is no resource available capacity as a result of the check, and the operator core network interworking control unit 110 communicates with the first provider network. Control to terminate the interworking call session configuration of the. On the other hand, the call admission control unit 151, if there is available resource capacity for the resource requested in the resource permission request message The occupation request message is output to the resource allocation processing unit 130. The call acceptance controller 151 outputs the resource permission notification message to the provider core network interworking controller 110 when a resource occupancy notification message for the in-network and external SIP-based provider core networks is input from the resource allocation processor 130. The operator core network interworking controller 210 is configured to output the interworking call session establishment request message to the second provider network when a resource permission notification message is input from the call acceptance controller 250.

2 is a flowchart illustrating resource allocation between SIP-based provider networks according to an embodiment of the present invention. As illustrated, the SIP-based provider core network system A includes a provider core network interworking controller 410, a call admission controller 430, and a core network border gateway 450. The service provider core network interworking controller 310 and the core network border gateway 330 may be configured to be included.

The operator core network interworking control unit 410 of the SIP-based operator core network system A generates a resource permission request message including resource information necessary for call interworking when a call connection request message is input from another operator core network connected to the network (S51). The call reception controller 430 outputs the call acceptance control unit 430 (S52).

The call admission control unit 430 reads the network resource information from the storage unit when the resource permission request message including resource information necessary for call interworking is input from the operator core network interworking control unit 410 to the resource requested by the resource permission request message. Check whether there is an available capacity (S53). If there is no resource available capacity, the call acceptance control unit 430 outputs a resource allowance failure message to the operator core network interworking control unit 410 (S54). Control to terminate session setup. On the other hand, the call admission control unit 430, if there is available resource capacity for the requested resource The occupation request message is output to the core network border gateway 450 (S55).

When the resource occupancy request message is input from the call admission controller 430, the core network border gateway 450 checks a path to allocate the network resource required by the resource occupancy request message and allocates an optimal transmission path (S56). For example, in case of interworking calls between provider networks, the core network border gateway between different SIP-based provider core network systems establishes an optimal routing path for allocating the required resources and transmits resources required by the session, such as uplink and downlink. Occupies bandwidth information.

After checking the optimal resource path, the core network border gateway 450 occupies resources by allocating an optimal transmission path with the SIP-based provider core network system B connected to the network (S57). The core network border gateway 450 receives a response message including the SIP-based provider core network system B and whether or not optimal resource allocation is possible, and outputs a resource occupation notification message to the call admission controller 430 (S58).

If the resource occupancy notification message is input from the core network border gateway 450, the call acceptance controller 430 outputs a resource permission notification message to the operator core network interworking controller 110 (S59). The operator core network interworking control unit 110 receives the resource permission notification message from the resource allocation processor 130 and outputs the interworking call session establishment request message to the SIP-based provider core network system B when allocating necessary resources (S60). .

3 is a flowchart illustrating resource allocation in a SIP-based provider core network according to an embodiment of the present invention. As shown, the SIP-based provider core network system C includes a provider core network interworking control unit 610, the SIP-based provider core network system D is the operator core network interworking control unit 710 and the call acceptance control unit 720 And a core network border gateway 730 and an access network border gateway 740.

The operator core network interworking control unit 410 of the SIP-based provider core network system D allows a resource including resource information necessary for call interworking processing when a call connection request message is input from the SIP-based provider core network system C connected to the network (S81). A request message is generated and output to the call acceptance control unit 720 (S82).

The call admission control unit 720 reads network resource information from the storage unit when the resource permission request message including resource information necessary for call interworking processing is input from the operator core network interworking control unit 710, and then requests the resource in the resource permission request message. Check whether there is an available capacity for (S83). If there is no resource available capacity, the call acceptance control unit 720 outputs a resource allowance failure message to the operator core network interworking control unit 710 (S84) and the operator core network interworking control unit 710 communicates with the SIP-based operator core network system C. Control to terminate the interworking call session setup. The call admission control unit 720, if there is available resource capacity, for the resource requested by the core network border gateway 730 The occupation request message is output (S85).

When the resource occupancy request message is input from the call admission control unit 430, the core network border gateway 730 selects not only the core network border gateway 730 but also the access network for the optimal path in the network for allocating the resource requested by the resource occupancy request message. Check up to the border gateway (740) (S86), network Resource allocation is set (S87). Thereafter, the core network border gateway 730 outputs a resource occupancy notification message to the call acceptance controller 720 (S88). Thereafter, the call admission control unit 720 outputs a resource permission notification message to the operator core network interworking control unit 710 (S89).

The operator core network interworking control unit 710 receives the resource permission notification message from the call admission control unit 720 and allocates the requested resource (S90).

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings, but this is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (3)

In the call admission control method for call interworking between SIP-based provider networks, Receiving a call connection request message from a first operator network, which is another operator network connected through a network; When the call connection request message is input, checking whether there is an available capacity of a resource required for call interworking with a first provider network; Outputting a resource allocation request message to a second network connected to a network if there is a resource available capacity as a result of the checking, and if the resource available capacity is not available, terminating the establishment of an interworking call session with the first provider network; Call admission control method for call interworking between the SIP-based provider network comprising a. The method of claim 1, Receiving a response message including whether resource allocation is possible from a second network connected to the network; Outputting an interlocking call session establishment request message to a second provider network if resource allocation is possible as a result of confirming the input response message, and ending the interworking call session establishment with the first provider network if resource allocation is not possible; Call admission control method for call interworking between the SIP-based provider network further comprises. The method of claim 1, wherein the step of outputting the resource allocation request message to the second provider network connected to the network if there is a resource available capacity as a result of the checking, and if the resource available capacity is not available, terminating the establishment of the interworking call session with the first provider network. : Processing in-network resource allocation if there is an available capacity of a resource required for call interworking with the first provider network; Call admission control method for call interworking between the SIP-based provider network further comprises.