KR100311226B1 - Method for selecting NNI Signaling Protocol in public ATM networks - Google Patents

Abstract

The present invention relates to a method for determining a relay signaling protocol in a broadband integrated telecommunications network switching node. In order to enable the switching node to control the call between operators using the B-ICI signaling protocol without using additional gateway function, the switching node uses the route number connected to the called number, the network identification number of the next node, and the call setup request message. A first step of generating route information to the next node to be used when outgoing by the fixed routing method supporting the required amount of resources; Receiving a call setup request from the outside and determining that the outgoing call is made, the second step of checking whether the network of the provider to which the next node belongs uses the same protocol from the network identification information of the route selected in the number translation; A third step of transmitting a call setup request message to a next node using the same protocol, if it is determined that the service provider network uses the same protocol; And a fourth step of transmitting a call setup request message to a next node using a protocol of a provider network to which the next node belongs, if it is a provider network using another protocol.

Description

Method for selecting NNI signaling protocol in public ATM networks

The present invention relates to a method for establishing a call between carrier networks, and in particular, the gateway switching node between the operator networks enables B-ISUP, which is a relay signaling protocol in the operator network, and B-ICI, which is a relay signaling protocol between the carrier networks, to be selected. The present invention relates to a method for determining a relay signal protocol in a telecommunication switching network node and a computer-readable recording medium having recorded thereon a program for realizing the relay signal protocol.

In the present invention, a relay protocol between B-ISUP and a provider network defined as a relay protocol in a provider network through a translation and routing process of a call originating or relaying from an ATM VC node of a specific provider network among all B-ISDN networks composed of multiple provider networks. The present invention relates to a method for determining a relay signal protocol that should be used when a call setup request is made to a next node by referring to information of a provider network to which a next node belongs among B-ICIs.

In the B-ISDN network, which consists of multiple provider networks, B-ICI, which can be used as a relay signaling protocol between carrier networks by agreement between providers, has additional messages and parameters (network identification code, billing number, network selection information, Outgoing line information, outgoing relay information), and additional information (billing and statistics) can be extracted for providing a service through a multi-entry network and operating the network accordingly.

However, the public network switching node operating in the conventional PSTN, N-ISDN, and B-ISDN networks defines and uses the signaling protocol between the carrier networks in the same way as the signaling protocol in the provider network. There is a problem of defining and using an additional inter-gateway system (IGS) for operational preservation (billing and statistics).

The present invention has been made to solve the above problems, by allowing the gateway switching node between the operator network to select B-ISUP, which is a relay signaling protocol in the operator network, and B-ICI, which is a relay signaling protocol between the operator networks, A gateway signaling protocol decision method in a broadband integrated telecommunications network switching node capable of controlling call between providers networks using B-ICI signaling protocol without additional gateway function (IGS) in gateway switching between provider networks and realizing it Its purpose is to provide a computer readable recording medium having recorded thereon a program.

1 is a functional block diagram for call setup in an asynchronous transfer mode (ATM) exchange to which the present invention is applied;

2 is an explanatory diagram of a signaling protocol used in the entire B-ISDN network composed of multiple operator networks to which the present invention is applied.

3 is a flowchart illustrating a method for determining a relay signal protocol in a broadband integrated information network switched node according to the present invention.

In order to achieve the above object, the present invention provides a method for determining a relay signaling protocol applied to a broadband integrated telecommunication network switching node, comprising: a route number connected to a called number, a network identification number of a next node, and a call setup request message; A first step of generating route information to the next node to be used when outgoing by a fixed routing scheme supporting resource amount; Receiving a call setup request message from the outside, and determining that the call originating number is determined by number translation, a second step of confirming whether the operator network to which the next node belongs uses the same protocol from the network identification information of the root beam selected in the number translation; A third step of transmitting a call setup request message to the next node using the same protocol if the provider network using the same protocol is found as the result of the second step; And a fourth step of transmitting a call setup message to the next node using a protocol of the provider network to which the next node belongs, if the operator network using different protocols is determined as the second step.

In addition, the present invention, the fixed routing to support the amount of resources required in the call routing request message, the route number connected to the called number, the network identification number of the next node, and the call setup request message to the switching system having a processor for call setup through routing A first function of generating route information to a next node to be used for outgoing by the scheme; Receiving a call setup request message from the outside, if it is determined that the outgoing call number through the number translation, from the network identification information of the route number selected in the number translation, the selected route information to check whether the operator network to which the next node uses the same protocol Second function; A third function of transmitting a call setup request message to the next node using the same protocol if the service provider network using the same protocol is confirmed as the second function; And a program for transmitting a call setup message to the next node using a protocol of the service provider network to which the next node belongs if the service provider network using different protocols is determined as the second function. Provide a computer-readable recording medium for recording.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram for call setup in an ATM switch to which the present invention is applied.

The ATM switching system includes a subscriber local subsystem (ALS) (hereinafter referred to as ALS) 101, a central subsystem interconnecting ALS (ACS) (hereinafter referred to as ACS) 102 It consists of.

The ALS 101 includes a Subscriber Interface Module (SIM) 103, a Trunk Interface Module (TIM) 104, and a Call and Connection Control Processor (CCCP) 105. The ACS 102 includes an Operation & Maintenance Processor (OMP) 111 (hereinafter, referred to as an OMP).

OMP 111 is a processor that performs operation and maintenance functions. It provides billing, statistics, and operator matching functions. Terminating Address Translation Control Function (TATCF) that requires centralized processing for call / connection setup. Block) 112 and a routing and subroute setting function (SRTCF: Static RouTing Control Function Block) 113 during dispatch.

And, as a data processing block for called number translation and route and subroute setting function, number data control function (NADHF: Network Address Data Control Function) (115) and route and subroute data control function (SRDHF: Static Routing Data Handling Control) Function 114 is included in OMP 111.

The signal information received at the subscriber terminal is transmitted to the Digital Signaling Interface Function (DSIF) 106 of the CCCP 105 which performs a signal protocol matching function with the user terminal at the subscriber matching device (SIM) 103. .

The digital signal interface function (DSIF) 106 sends the decoded signal message to a digital protocol control function (DSCF) 107 that controls the call / connection setup.

In the digital protocol control function (DSCF) 107, a NATCF (Network Address) that performs a station number translation function to determine a call type (local code, outgoing call) of a call / connection requested for setting if there is no error after an error check for an incoming message. Translation Library Function (108).

If the call requested by the NATCF 108 is an outgoing call, the route number, call type (international call, long distance call, local call, and own destination signal) and additional promised data required for outgoing call processing are forwarded to the DSCF 107. In addition, the DSCF 107 transmits the route number received from the NATCF 108 to the SRTCF 113 in the OMP 111 and a bandwidth for satisfying the quality of service (QoS) required by the subscriber. Requires.

In the routing process, a route capable of call setup is determined, and a subroute connected to the route is selected, and the ALS 101 in which the outgoing call with the subroute is set is selected and transmitted to the DSCF 107.

The DSCF 107 transmits data required for call / connection control to the outgoing call control block (BPCF: B-ISUP Protocol Control Function) 109 of the selected ALS 101 and transmits a call setup message to another ATM switching node. Do it.

The BPCF 109 performs call control according to a Network-Network Interface (NNI) protocol, and then a B-IFP Protocol (BPIF) 110 and a Trunk Interface Module (TIM) 104. Send a call setup message to the other exchange.

In the case of an incoming call received through the network interface (NNI), the signal message decoded by the BPIF 110 is transmitted to the BPCF 109 that controls the call / connection setup.

The BPCF 109 determines the incoming or outgoing call by number translation, and if the outgoing call is requested by the SRTCF 113 for routing processing, and transmits a call setup message to the next node in the same manner as in the DSCF 107. do.

The NADHF 115 located in the OMP 111 allocates the station number received through the operator matching function to the routing table used by the NATCF 108 to translate the station number.

In the number planning of B-ISDN public network, all called numbers operated in the network include information for recognizing up to 10 specific provider networks.In the NADHF 115, the station number according to all address systems of the network input by the operator is included. Include the carrier network identification information (self, net1, net2, ~ net9) defined in the own network in the information.

In the number translation process for the called number, this network identification information is used to determine which network operator the called subscriber belongs to, and the carrier network identification information of the next node is determined by combining with the network selection information included in the call setup message. It is used to

The SRDHF 114 located in the OMP 11 performs a function of generating and managing a subroute connected with a route representing a logical path and physical information on which a call is to be set. The route number is generated through operator matching to generate a route. Receives incoming call point information and B-ISDN network operator identification information (self, net1, net2, ~ net9) defined in its own network, and sends outgoing signaling point defined in its own node and received incoming signal point information Create one route by reference.

In order to generate network identification information of the next node entered by the network operator in the route information, the SRDHF 114 uses the operator network identification information (self, referred to when generating the station number based on the network operator identification information input by the network operator at the time of route creation. With the same information as net1, net2, ~ net9), all exchange nodes of the same provider search for information (R_NETWORK_ID) that distinguishes the entire B-ISDN provider network.

If the search fails, an output message indicating the failure situation is output to the operator terminal, and if successful, the operator network identification information used for the search is set as the operator network identification information of the generated route. The operator network identification information for each route generated as described above is used as information for determining a relay signaling protocol to be used when setting up a call to the selected route during the routing process.

2 is an explanatory diagram of a signaling protocol used in the entire B-ISDN network composed of multiple operator networks to which the present invention is applied.

In the B-ISDN network consisting of up to 10 public network operators, B-ISUP is used for the relay signal protocol in a specific provider network and B-ICI signaling protocol is used for the carrier networks.

Arrows in the figure also indicate the logical route generated based on the signal point information assigned to each node along with the signal protocol used. That is, '201 to 204' in FIG. 2 indicates a route number with the power exchange node interworked in the A network operator node 206, and each route information is defined in the corresponding operator network through data processing in the SRDHF. Operator network identification information is configured together.

In the A operator network, define the C operator network as net1, the B operator network as net2, and define their network as Self. In the route setting process in SRDHF, the route '201' is 'net1', and the '202' is 'Self'. , '203' is set to the root data included in the network identification information 'net2'.

If a direct route connected to a specific originating call station number is defined as '201' in the gateway node 206 of the provider network, SRDHF generates an abnormal state of the direct route '201' or a resource shortage due to congestion. Up to eight bypass routes can be set for this purpose. The bypass route includes '202' and '203' routes.

The network identification information included in the bypass route is set to a different value according to the power, and this information is used to determine the relay signaling protocol to the next node in the same manner as when the direct route is selected in the routing process for establishing the call.

3 is a flowchart illustrating a method for determining a relay signaling protocol in a broadband integrated information network switched node according to the present invention, wherein a DSCF performing an outgoing subscriber call control function and an outgoing call in a BPCF performing a relay call control function. The present invention relates to a method for determining a route and relay signal protocol in an SRTCF that receives a routing request signal.

The DSCF and the BPCF receive a call establishment request, call the TATCF block of the CCCP, and the TATCF determines whether the call type is an outgoing call by performing a number translation based on the called number and the received relay network selection information.

In case of DSCF or BPCF, if the result of number translation in NATCF is considered outgoing call number, the routing request signal including the direct route number selected in number translation, required resource amount of call setup request message, and network identification information of the next node is transmitted. Send to

When receiving a routing request from the SRTCF, the route number included in the routing request is recognized as a direct route, and the database is searched for storing all route information of the node using the direct route (301), and the root status is confirmed to be normal. (302).

As a result of the check, if the searched direct route is normal and the requested amount of resources cannot be provided, up to eight bypass routes connected to the direct route are repeatedly searched until the root state and the requested resource amount are satisfied (304). ).

As a result of the check, if the direct route and all routes connected to the direct route are abnormal, a routing failure signal is transmitted to the DSCF and the BPCF requesting routing (304, 305).

As a result, if the available routes are found in the direct route or the bypass route, it searches up to 32 sub routes connected to the route and searches the available sub routes based on the status and resource amount of the sub route, and the available sub routes. The ALS, TIM, LINK information, VPCI, VPI information and the originating node signal point and the destination node signal point indicating the set physical information are set in the routing result transmission message (306 to 309).

In operation 310, it is determined whether the network identification information of the route information successfully retrieved is 'Self' indicating its network in order to select the relay signal protocol to be used in the DSCF or the BPCF.

If it is determined that the network identification information of the selected direct or detour route is 'Self', B-ISUP should be used as the relay signal protocol for call setup to the next node, and this information is set to BICI = false in the routing result transmission message. Set to be transmitted (311, 313), and if it is not 'Self', its network identification number and its next node represented by 3 to 4 digits to be set in network identification code and network selection information in B-ICI signaling protocol. To indicate that the network identification number and the signaling protocol to the next node are B-ICI, BICI = true is set in the routing result message, and the routing result is transmitted to the DSCF or BPCF requesting routing (312, 313).

In the DSCF or BPCF that has received the successful routing result, if the BICI of the routing result is 'false', the next node means its own network, so the B-ISUP relay signaling protocol is used. If the BICI is 'true', the B-ICI relay signaling protocol Sends a call setup request message to the next node using.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited by the drawings.

As described above, the present invention can accurately provide information necessary for addition or deletion of the relay network selection information included in the call setup message in the call control process between the operator networks, and also B-ISUP in the operator network, and B- in the operator network. According to the network identification information of the direct route or bypass route information selected in the gateway switching node between the carrier networks using the ICI relay signaling protocol, it is possible to determine the relay signaling protocol to be selectively used.

Claims (2)

In the relay signal protocol determination method applied to a broadband integrated information communication network switched node, A first step of generating route information connected to a called number, a network identification number of a next node, and route information to a next node to be used for outgoing by a fixed routing scheme supporting a required amount of resources in a call setup request message; Receiving a call setup request message from the outside, and determining that the call originating number is determined by number translation, a second step of confirming whether the network of the operator to which the next node belongs uses the same protocol from the network identification information of the route information selected in the number translation; A third step of transmitting a call setup request message to the next node using the same protocol if the provider network using the same protocol is found as the result of the second step; And A fourth step of transmitting a call setup message to the next node using a protocol of the service provider network to which the next node belongs if the service provider network using different protocols is determined as the second step; Relay signal protocol determination method in a broadband integrated information communication network switching node comprising a. In the exchange system with a processor for call setup through routing, A first function of generating route information connected to a called number, a network identification number of a next node, and route information to a next node to be used when outgoing by a fixed routing scheme supporting a required amount of resources in a call setup request message; Receiving a call setup request message from the outside, if it is determined that the outgoing call number through the number translation, from the network identification information of the route number selected in the number translation, the selected route information to check whether the operator network to which the next node uses the same protocol Second function; A third function of transmitting a call setup request message to the next node using the same protocol if the service provider network using the same protocol is confirmed as the second function; And A fourth function of transmitting a call setup message to the next node using a protocol of the service provider network to which the next node belongs if the service provider network using different protocols is determined as the second function. A computer-readable recording medium having recorded thereon a program for realizing this.