KR100248418B1 - Routing method for atm vcr exchange - Google Patents

Abstract

The present invention relates to a routing method for interworking NNI and B-ICI in an ATM VC exchange. When routing for relay call processing in an ATM VC exchange, a node is selected from a network outside the system. Since the processing method of billing is different depending on whether the corresponding node is the node of the same operator or the node of another operator, the operator information becomes the main element of the relay call processing. There are several methods of relay call processing. One method of exchanging provider information between nodes is B-ICI, and the other is NNI unless it is exchanged. The relay call processing of the existing ATM VC exchange is developed by adopting only one of these methods, so that when NNI and B-ICI are interworked, generation and retrieval of service provider information becomes a problem when routing. Accordingly, the present invention enables to store the carrier information inside the ATM VC switch, so that the carrier information necessary for routing can be generated and retrieved in a network in which the NNI and B-ICI are interworked. In this case, the processing using the NNI method is performed between nodes of different operators to enable the B-ICI method.

Description

Routing method for interworking between N & I and non-IC in ATM VC exchange

The present invention relates to a routing method for interworking NNI and B-ICI in an ATM VC exchange. In an ATM VC exchange, a relay call processing refers to processing when a subscriber wants to connect a call with a subscriber not in its own country. Routing) allocates a virtual channel to a subscriber for the call processing. Therefore, when routing for relay call processing from the exchange's point of view, the node is selected from the network outside the system. The problem is that depending on the relay call processing method, whether the node is the node of the same operator or the Node recognition is a major factor in billing. One method of exchanging provider information between these nodes between nodes is B-ICI, and the other method is NNI unless exchanged. Therefore, if the NNI and the B-ICI are interworked with the existing ATM switch relay call processing method, which was developed in only one way, retrieval of carrier information at the time of routing becomes a problem.

In case of relay call processing between other subscribers in ATM VC (Asynchronous Transfer Mode Virtual Channel) switch which is established by conventional signaling method, it handles relay call by NTU (Network Node Interface) which is ITU-T recommendation or recommendation of ATM forum. The function of handling a relay call using the B-ICI (B-ISDN Inter Carrier Interface) method was implemented. However, in the network implemented with relay call processing between different providers with B-ICI method, and relay call processing between same carriers with NNI method, it is necessary to determine whether the relay call between the same operators or between other providers is used to process two or more relay calls. There was a need for a distinguishable way.

Accordingly, an object of the present invention is to enable the carrier information to be stored in the ATM VC switch, so that the operator information necessary for routing can be generated and searched in a network in which NNI and B-ICI are interworked. In this case, the processing using the NNI method is performed between nodes of different operators to enable the B-ICI method. A route is a set of virtual channels called a subroute, and the destination nodes of sub routes belonging to the same route are the same. Each subroot has its main information, the interface module, the link, and the bandwidth within a node. In addition, sub routes within the same route may have different interface module information, link information, and bandwidth information.

1 is a structural diagram of an ATM VC exchange system.

FIG. 2 is a diagram illustrating a configuration and message flow between NNIs and related blocks for performing a B-ICI interworking function implemented on an ATM VC switch; FIG.

3A and 3B are a general flowchart of a routing method when B-ICI interworking with an NNI implemented on an ATM VC switch.

* Description of the symbols for the main parts of the drawings *

100: first ALS 111: UPIF

112: UPCF 110,210: CCCP

113: ULRHF 114: SLRHF

115,214: NTLF 120: SIM

121: SIMCF 200: second ALS

211: NPIF 212: NPCF

213: NLRHF 220: TIM

221: TIMCF 300: ACS

311: NTCF 312: RTCF

410: RDHF 420: NDHF

430: NLRHF 440: RTCF

450: NPCF 460: NPIF

A routing method for interworking NNI and B-ICI in an ATM VC exchange for achieving the above object includes receiving a routing request for relay call processing from an NPCF and selecting a candidate route; Selecting candidate subroots by extracting information on subroots from the selected candidate route; Checking a state of the selected candidate subroute and allocating a bandwidth; Applying the allocated bandwidth information to bandwidth information of a route; Extracting operator information from route information and determining whether it is NNI method or B-ICI method based on this, and if the corresponding call is made between nodes of the same provider, processing using NNI method is performed between nodes between different operators. If it is made, characterized in that to enable the B-ICI method.

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

1 is a structural diagram of an ATM VC switch system. As shown, the ATM VC switch includes a first and a second ATM Local Switching Subsystem (ALS) 100 and 200 and an ATM Central Switching Subsystem (ACS) 300. . The first and second ALSs 100 and 200 may include a Call and Connection Control Processor (CCCP) 110 and 210 for performing a call and connection function, a trunk interface module 220 for performing a matching function between nodes, and a subscriber. It consists of a subscriber interface module (SIM) 120 that performs a matching function, and the ACS 300 includes an operation and maintenance processor (OPM) that performs operations, maintenance, billing, statistics, and operator matching functions.

Looking at the function of each block required to perform the call processing, UPIF (User Protocol Interface Function) 111 converts the matching function of the user terminal and the signaling protocol and the received signal message to the call processing internal message to UPCF (User Protocol Control Function) ), And the UPCF 112 is a call processing block which receives a message from the UPIF 111 and performs a call and connection function. When an error occurs, abnormal call release function is performed. The UNIR Link Resource Handling Function (ULRHF) 113 is a block that manages User Network Interface (UN) link resources between the user terminal and the exchange, and the Switch Link Resource Handling Function (SLRHF) 114 is used between subsystems in an ATM exchange. A block that manages switch link resources. Number Translation ALS Function (NTLF) 115,214 and Number Translation ACS Function (NTCF) 311 perform the function of number translation, Subscriber Interface Module Control Function (SIMCF) 121 and Trunk Interface Module Control Function (TIMCF) 221 performs a function of matching a subscriber link and a trunk link, respectively, and attaches cell routing information. The NPIF block 211 performs a function of receiving a message from another station, converting it into a relay call processing internal message, and transmitting the message to the NPCF 212, and the NPCF 212 receives an incoming call processing message from the NPIF 221. By performing relay call connection and setup or receiving outgoing call processing message from UPCF 112, it is a block for performing outgoing call connection and setup to another station. The RTCF block (Route Translation ACS Function) 312 manages routing resources, and the NNI Link Resource Handling Function (NLRHF) 213 is a block for managing network resources.

FIG. 2 is a diagram illustrating a configuration and message flow between related blocks for performing an NNI and a B-ICI interworking function implemented on an ATM VC switch. As shown, the RDHF 410 and the NDHF 420 are blocks for receiving a network data and operator data from an operator and constructing a database. The RDHF block 410 receives the information on the route from the operator and stores it in a relational database. The RDHF block 410 receives the information about the routing scenario and searches the relation with the route, and then retrieves the relation with the relation. To the database. In addition, it receives the operator requirements for the subroute and delivers the operator requirements to the NDHF of the ALS. The NDHF block 420 analyzes the operator requirements for the subroute transmitted from the RDHF 410 and processes the creation, retrieval, modification, and deletion of the subroute. At this time, the table-type data is processed using the library of the NLRHF block 430, and access to the database is directly processed. Carrier information must be required for the operator's route creation requirements, and it is used as an important clue for interface decision when NNI and B-ICI interwork. NPIF 460, NPCF 450, and RTCF 440 all directly handle NNI and B-ICI interworking with substantial blocks that handle the network interface. The NPIF 460 processes the interface between the incoming and outgoing nodes, and assembles and disassembles the message processed by the NPCF 450 and transmits the same to the NPCF 450 of the own station or the NPIF 460 of another station. In this case, the variable of the message to be processed depends on the type of message, and the type of the message is NNI or B-ICI. NPCF generates inter-station messages or analyzes inter-station messages received from other stations for call processing connection to other stations originating in its own country. When generating an inter-station message, a B-ICI message is generated for an inter-station call processing request belonging to another operator. In case of an inter-station call processing request belonging to the same operator, an NNI message is generated. After analyzing the inter-station message, if it is not a call processing request for its own subscriber, the inter-station message is generated in the same way as the message generation. In the NPCF 450, whether the type of inter-station call processing is between the same providers or between different providers is requested to the RTCF block 440 for inquiry.

3A and 3B are flowcharts illustrating a routing method when B-ICI interworking with an NNI implemented on an ATM VC switch. When the routing request signal is transmitted from the UPIF block (1), the RTCF block changes all variables to its initial state, False, and prepares for routing by analyzing routing scenario information and required bandwidth information in the signal. Afterwards, find the appropriate subroot for the repeated route and the result of the subroutine search (3). If the appropriate subroot is found, if it is a relay call processing between the same providers using the carrier information of the corresponding route (16), the NNI route to NPCF The information is transmitted (17), and the B-ICI route information is transmitted (18) if it is a relay call process between different providers. If no suitable subroute is found, it checks whether there is a route to look for (4). If there is no route to look for, it sends a routing failure to NPCF (15) and returns to the initial state above to request a route from NPCF. Wait. If the route to be searched still exists, the route information in the database is extracted using the routing scenario information (5). Among the route information, the candidate route is selected by comparing the bandwidth with the requested bandwidth (6) and the candidate route exists (7) and if the candidate route does not exist, the routing failure is transmitted to the NPCF (12). Waiting for routing request. If there is a candidate route, the number and number of subroots belonging to the corresponding route are extracted from the database (8). Inspecting the bandwidth of the subroutes to select a candidate subroute that can accommodate the required bandwidth (9) and checking for the existence of the candidate subroute (10) to select the next candidate route if the candidate subroute does not exist. Check the remaining routes (11), and if there is a candidate subroute, check the state of the subroute (12) If bandwidth allocation is possible, check the state of the selected candidate subroute, allocate bandwidth and The bandwidth information is modified and the ALS, IM, LINK, VIP information of the subroute and the carrier information of the route are collected and transmitted to the NPCF (13). If the state of the subroute cannot allocate bandwidth, the next subroute is searched (14).

According to the present invention, it operates in an ATM VC switch and has the following effects.

First, it is possible to increase the external competitiveness by allowing the interworking call processing S / W, which only accepts the existing NNI method, to be interlocked with the B-ICI method.

Second, by dividing the service provider information by the route can reduce the time spent searching for information.

Third, it is possible to increase the consistency of data by database the business information.

Claims (4)

Receiving a routing request for relay call processing from an NPCF and selecting a candidate route; Selecting candidate subroots by extracting information on subroots from the selected candidate route; Checking a state of the selected candidate subroute and allocating a bandwidth; Applying the allocated bandwidth information to bandwidth information of a route; Extracting the operator information from the route information and determining whether the NNI method or the B-ICI method based on the routing method for interworking NNI and B-ICI in the ATM VC switch. The method of claim 1, wherein the candidate root selection step comprises: Initializing all variables when a routing request signal is transmitted, and preparing routing by analyzing routing scenario information and required bandwidth information in the signal; If no suitable subroute is found, checking whether there is a route to be searched, waiting for a routing request if there is no route to be searched, and extracting route information in the database using routing scenario information if a route to be searched remains; The candidate route is selected by comparing the bandwidth with the requested bandwidth among the extracted route information, and if the candidate route does not exist, waiting for a routing request is performed. Routing method for interworking ICI. The method of claim 1, wherein the selecting of the candidate subroots comprises: If the candidate route exists, extracting the number and number of subroots belonging to the route from the database; A method for routing NNI and B-ICI in an ATM VC switch, characterized in that the step of selecting the candidate subroute that can accommodate the required bandwidth by checking the bandwidth of the subroute. The method of claim 1, wherein the determining method comprises: In the ATM VC switch, it finds a suitable subroute and transmits NNI route information if it is a relay call processing between the same providers using carrier information of the corresponding route, and transmits B-ICI route information if it is a relay call processing between different providers. Routing method for interworking NNI and B-ICI.

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