KR20010002717A - Exchange capable of increasing the capacity of trunk for a common channel signalling network - Google Patents

Abstract

PURPOSE: An exchange for increasing a trunk capacity in a common channel signaling network is provided to set up own signaling point codes(OPCs) allocated to an own signaling point, and to make the OPCs differently allocated according to circuit identification codes(CICs), thereby increasing the trunk capacity in proportion to the number of the OPCs allocated to the own signaling point. CONSTITUTION: If an optional signal requesting the handling of a trunk call is supplied, a user part call control(UC)(202) respectively generates destination point codes(DPCs), circuit identification codes(CICs) in an own station, and user data corresponding to the optional signal, to control the handling of the trunk call. A signaling network management(SNM)(208) has a table, wherein own signaling point codes(OPCs) are allocated according to the CICs. A user part interface(UPI)(204) searches the table of the SNM by using the CICs transmitted from the UC(202), to extract corresponding OPCs. And the UPI(204) formats the DPCs, the CICs, and the user data with transmittable types for transmitting. A signal message handling(SMH) delivers messages transmitted from the UPI(204) to a destination through a NO.7 user block.

Description

Switching to increase relay capacity in common line signaling network {EXCHANGE CAPABLE OF INCREASING THE CAPACITY OF TRUNK FOR A COMMON CHANNEL SIGNALLING NETWORK}

The present invention relates to an exchanger capable of increasing relay line capacity in a common line signaling network, and in particular, an ISUP of the number seven (hereinafter referred to as No. 7) common channel signaling system (hereinafter referred to as CCS). The present invention relates to an exchange having a structure capable of increasing the maximum allowable relay line capacity per one signaling end point (also called signaling end point, or signal point) in an interval (ISdn User Part, ISUP).

The common line signal network is a communication network that implements transmission of signals between stations in both directions by connecting a dedicated data link between control devices of an exchange. There are CCS corresponding to analog networks and CCS corresponding to digital networks. No. 7 CCS is the CCS corresponding to the digital network. It is the seventh standardized method in 1980 in CCITT.

This no. 7 CCS establishes a communication network so that each exchange is a signaling end station (SEP), a signaling link relay station (STP) exists between signaling end stations, and a common line between the exchange corresponding to the signaling end station and the exchange corresponding to the relay station. It is a method implemented to transmit variable length control information (or signal message) through a link via a signaling device (CSE: Common channel signaling equipment). To this end, 7 CCS is divided into a message transfer part (hereinafter referred to as MTP) and a user part (hereinafter referred to as UP).

No. The ISUP of 7 CCS is an UP that controls the inter-station signal section (or relay network section) of the ISDN, and transmits a communication line (or data link) signal during the switching period and establishes a link during the switching period. That is, it is possible to control the ISDN circuit switched call in the same procedure as the existing telephone exchange call and data exchange call. Therefore, No. 7 The ISUP section of the CCS is the section between the calling ISDN exchange and the called ISDN exchange.

This no. 7 ISUP signal messages, such as call setup message, communication message, and call disconnection message, transmitted through the data link configured in the ISUP section of CCS, have the same data format as the message signaling unit (MSU) shown in FIG. Is sent. That is, when transmitting an ISUP signal message, a signal point code (Destination Point Code, hereinafter abbreviated as DPC) of a large country, own signaling point code (abbreviated as OPC), a circuit identification code (Circuit Identification Code) (Hereinafter abbreviated as CIC) and user data are respectively carried.

At this time, the DSC and the OPC are fixed IDs (IDentifiers) for each signal station, and the CIC information is path information assigned to the subscriber. Thus, the acceptable relay line capacity per one signal station is determined by the CIC information bits. According to the ITU-T Recommendation, the above-mentioned CIC information is allocated 12 bits as shown in Fig. 1B. Of these 12 bits, 7 bits are used to indicate information about MP (MP #), LP (LP #), E1 board (E1- #) connected with the subscriber, and 5 bits are allocated trunk channel information (TRK). Used to represent #).

As a result of the 12-bit allocation of CIC information, the maximum allowable relay line capacity per single signal station has been limited to 4K. This is calculated at 2 ^{12 (CIC information} bits) = 1024 × 4 = 4096. Therefore, the existing No. 7 It was difficult to accommodate more than 4K of trunk line capacity per signal station in the ISUP section.

The present invention introduces a method of setting a plurality of signal point codes (OPCs) of the own station. 7 ISDN User Part (No. 7 ISUP) It is the purpose to provide a switch having a structure that can set the number of relay lines that can be accommodated per signal terminal station more than 4K or multiples of the signal point code of its own station in the section. .

In order to achieve the above object, the switch according to the present invention, in the switch capable of relay call processing in the number seven integrated information network network user section existing in the common line signal network, any signal requesting the relay call processing is applied. ISDN user part call control unit (IUC) which controls relay call processing while generating user data corresponding to a signal point code (DPC) of a large country to receive a message, a circuit identification code (CIC) in a local station, and an arbitrary signal, respectively. ); A signal network manager (SNM) having a table for allocating signal point codes (OPCs) of its own station for each circuit identification code (CIC); Search the table of the Signaling Network Management Unit (SNM) by using the circuit identification code (CIC) transmitted from the ISDN user unit call control unit (IUC), extract the corresponding signal point code (OPC) of the local station, and ISDN user unit call control unit A user interface unit (UPI) which formats and transmits the signal point code (DPC), the circuit identification code (CIC), and the user data of a large station transmitted from the IUC in a form that can be transmitted; And a signal message handling unit (SMH) for transmitting a message transmitted from the user interface unit (UPI) to a power station through the number seven integrated information network network user section.

1A shows No. 7 is a general data format diagram of MSU (Message Signaling Unit) transmitted in ISUP interval,

FIG. 1B is a data format diagram of the circuit identification code (CIC) shown in FIG. 1A;

2 is a functional block diagram of an exchange according to the invention,

3 is a data format diagram of a local signal point code (OPC) area shown in FIG. 1A.

<Description of the symbols for the main parts of the drawings>

200: No. 7 Signal main processor (MP) 202: User code control unit (IUC)

204: user interface unit (UPI) 207: network test management unit (NTM)

206: Common Line Signal Processor (CSP) 208: Signal Network Management Unit (SNM)

209: Signal message handling unit (SMH) 220: Database for trunk

210: Database for management of power point code (DPC)

230: main processor for maintenance

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

FIG. 2 is a schematic functional block diagram of an exchange according to the present invention, in which a processor in the exchange is divided into a line processor (hereinafter referred to as LP) and a main processor (hereinafter referred to as MP) structure. This is an example applied to the exchange. The above-described LP mainly performs matching processing with subscribers, and the MP mainly performs overall call processing.

2, the exchanger according to the present invention, No. is connected to the LP not shown. 7 Signaling main processor (hereinafter abbreviated as MP) (200), DPC database for managing the signaling point code (Destination Point Code, abbreviated as DPC) of the country that accepts the incoming call number entered by the originating subscriber ( DataBase, hereinafter abbreviated as DB) 210, trunk DB 220 for managing information related to trunks currently in use and trunks not in use, and maintenance MP for managing overall maintenance of the exchange. 230).

Double No. 7 MP (200) is the ISDN user part call control (IUC) (202), which controls the overall call processing for ISUP inter-station signal relay, performs a reformatting operation for the ISUP signaling message User Part Interface (hereinafter referred to as UPI) 204, No. It is configured to include a common channel signaling processor (hereinafter referred to as CSP) 206 that performs a message transfer part (hereinafter, referred to as MTP) function among the seven functions. The CSP 206 is a network test management unit (hereinafter referred to as NTM) 207, which performs a test and monitoring function on a signal link. 7 Signaling network management unit (Signaling Network Managment, abbreviated as SNM) 208, which performs management functions for signaling terminal station, signal link and signal route of signal network, and No. in ISUP section. It consists of a Signaling Message Handling section (hereinafter abbreviated as SMH) 209 which performs the function of delivering the signaling message over the 7 signaling link.

The exchange configured in this way operates as follows.

First, if any message transmission is requested from the not shown LP through any call or ISUP interval for any subscriber, the IUC 202 uses the digit information of the called party to which the message is to be sent. ), And obtain the corresponding DPC information. Next, a trunk channel set to an idle state is obtained by referring to the trunk DB 220.

At this time, the message to be sent is a signal for a specific purpose such as additional call reference information or signaling point code, or the trunk to which the message is to be sent is occupied in a double occupied state (one trunk is set to bidirectional). In the case of a state that is received in an incoming call at the same time as the outgoing attempt in the state), IUC 202 determines the OPC for the message currently sent.

The OPC mounted on the MSU shown in FIG. 1A has a data structure as shown in FIG. That is, 2 bits of the total 16 bits are allocated as network identifier information, and 14 bits are allocated as pure OPC information. Therefore, the OPC determined by the IUC 202 corresponds to 14 bits. Information corresponding to these 14 bits is obtained by referring to the OPC table provided in the SNM 208. SNM 208 is provided with an OPC table as shown in Table 1 in accordance with the present invention.

Circuit identification code (CIC) Local station signal point code (OPC) (14bits) MP # 0, LP # 0, E1- # 0, Trk # 0 OPC 1 MP # 0, LP # 0, E1- # 0, Trk # 1 OPC 2 … … MP # 1, LP # 1, E1- # 1, Trk # 1 OPC N

As shown in Table 1, one local signal point code is assigned to each CIC. When one local signal point code is used, each local signal point code and the maximum relay line that can be allocated to the corresponding signal station are assigned. It has a structure that can be matched. That is, in case of setting and operating one local station signal point code in the signal station, when the maximum number of relay lines that one signal station can accommodate is 4K, if four OPCs having different values are allocated to the signal station, The OPC table is formed such that 4K relay lines are connected to each OPC. Therefore, an environment in which one signal terminal station can accommodate a maximum of 4 × 4K relay lines is set. The values for forming this OPC table are predetermined and loaded into SNM 208.

In order to obtain the corresponding OPC by referring to the OPC table configured in the SNM 208 as described above, the IUC 202 transmits the corresponding CIC information to the SNM 208. The SNM 208 searches for the presence of an OPC that matches the authorized CIC and provides the IUC 202 if the corresponding OPC exists. Accordingly, the message transmitted from the IUC 202 to the UPI 204 includes DPC, OPC, CIC, and user data.

However, if the message to be sent is a general call processing message that is not for a specific purpose such as additional call setup information and signaling station code, and the trunk to be sent is not in a double occupancy state, the IUC 202 may execute a DPC management DB ( The CIC information, the DPC information, and the user data information formed by searching the 210 and the trunk DB 220 are transmitted to the UPI 204.

The UPI 204 may reformat the message transmitted from the IUC 202 into a form that can be transmitted to the power station through the SMH 209 or process the message transmitted from the SMH 209 in the IUC 202. In this case, when OPC information is determined and transmitted in the IUC 202, the OUC information is formatted as shown in FIG. 1A and then transmitted to the SMH 209. However, if the OPC information is not included in the message transmitted from the IUC 202, the OPC request information using the corresponding CIC information is sent to the SNM 208. Accordingly, the SNM 208 retrieves the OPC information matching the currently applied CIC information from the OPC table provided in the IUC 202 and provides it to the UPI 204. UPI 204 uses the obtained OPC information and the DPC, CIC and user data transmitted from IUC 202. 7 Reformat the data to be sent over the ISUP section. The form that can be transmitted is as shown in FIG. 1A.

The message reformatted at UPI 204 is sent to SMH 209. The SMH 209 writes a message transmitted from the UPI 204 to the DPC, OPC, CIC, and user data structures. 7 Transmit to the larger country not shown through the ISUP section, and analyze the MSU received from the large country and analyze the DPC of the MSU before distributing it to the appropriate user part to determine whether it is OPC assigned to the relevant CIC of the country. If the OPC is not assigned to the maintenance MP 230, such a situation is output as a status message through the operator terminal (not shown). However, if it matches the assigned OPC, normal MSU reception procedure is performed.

As described above, the OPC information is processed as an optional parameter, but is processed as a mandatory parameter according to the present invention. In the past, the OPC was determined when the IUC 202 and the UPI 204 were loaded, but according to the present invention, since the OPC is allocated to each CIC according to the present invention, the OPC must be obtained for each relay line channel at a necessary time.

As described above, according to the present invention, a plurality of Own Signaling Point Codes (OPCs) allocated to the local signaling end stations are set so that a separate local signaling point code can be allocated to each CIC. 7 In the ISUP section, the number of acceptable repeater lines per signaling station can be increased in proportion to the number of OPCs allocated to the signaling station. That is, when the number of OPCs assigned to the corresponding signaling terminal station is N, the relay line capacity that can be allocated to the corresponding signaling terminal station can be increased up to N × 4K.

Claims (3)

In an exchange capable of relay call processing in the number seven user part existing in the common line signaling network, When an arbitrary signal for requesting the relay call processing is applied, the signal point code (DPC) of the large country to receive the message, the circuit identification code (CIC) in the local station, and user data corresponding to the arbitrary signal are generated, respectively. A user part call control unit (UC) for controlling the relay call processing; A signal network manager (SNM) having a table for allocating signal point codes (OPCs) of its own station for each of the circuit identification codes (CIC); Search the table of the signal network management unit SNM using the circuit identification code CIC transmitted from the user unit call control unit UC to extract the corresponding signal point code OPC of the corresponding local station, and the user. A user interface unit (UPI) for formatting and transmitting the signal point code (DPC), the circuit identification code (CIC), and the user data of the power transmitted from the code control unit (UC) in a form that can be transmitted; And a signal message handling unit (SMH) for transmitting a message transmitted from the user interface unit (UPI) to a power station through the number seven user unit section. Exchanger. The table of claim 1, wherein the table provided in the signal network management unit (SNM) is configured such that at least one signal point code of an own station is assigned to all the number of relay lines acceptable by the line identification code. In the number seven user part section, the number of repeater lines that can be accommodated per exchange is increased by the number that can be multiplied by the maximum number of relay lines that can be allocated when using one local signal point code. Switching system capable of increasing relay line capacity in line signal network. In an exchange capable of relay call processing in the number seven user part existing in the common line signaling network, A signal network manager (SNM) having a table in which a signal point code (OPC) of a local station is assigned for each circuit identification code (CIC); When a signal for a specific use requesting the relay call processing is applied or a double occupancy occurs, a power station signal point code (DPC) to receive a message, the circuit identification code (CIC) in the own station, and the corresponding signal are applied. Generating each user data, searching the table of the signal network management unit SNM using the generated circuit identification code CIC, and acquiring a corresponding signal point code OPC of the corresponding local station; A user call control unit (UC) for controlling the unit; A form capable of transmitting the station signal point code (DPC), the station signal point code (OPC), the circuit identification code (CIC), and the user data transmitted from the user part call control unit (UC) through the number seven user part section. A user interface unit (UPI) for formatting and transmitting the data; And a signal message handling unit (SMH) for transmitting a message transmitted from the user interface unit (UPI) to a power station through the number seven user unit section. Exchanger.