KR100236924B1 - Method for sending paging packet ips to mcs - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Method of transmitting call packet between subscriber matching device and call processing device in high speed paging system.

2. The technical problem to be solved by the invention

Minimize call loss in high speed paging system to provide reliable high speed call service.

3. Summary of Solution to Invention

When a call request signal is received, a call packet including subscriber information is generated, and the generated call packet is stored in a message queue, and the connection state with the operation mode call processor is checked. Read the stored call packet and send it to the call processing device. If the call packet is successfully transmitted, the remaining call packets are read repeatedly and sequentially transmitted. If the call packet fails, the current connection state is canceled and normal connection is attempted.

4. Important uses of the invention

Used for call processing in high speed paging systems.

Description

Method of transmitting call packet between subscriber matching device and call processing device in high speed paging system

The present invention relates to a method of transmitting a call packet between an intelligent peripheral device (IPS), which is a subscriber matching device, and a main control system (MCS), which is a call processing device, in a high-speed paging system. When the IPS transmits the call packet to the call processing device (MCS), the generated call packet is stored in the message queue before being delivered to the call processing device (MCS) in order to prevent call loss. It is a method of transmitting a call packet only if the connection to the service is valid.

Since the first wireless calling service in Korea, many subscribers have been accommodated through the development of various additional services and the development of technology to improve the supply and reception rate of various terminals.

Conventional low-speed paging systems perform call processing using a paging exchange network (TDX-PS). In such a paging system, call success rates exceed 99%. Among them, call loss rate by subscriber matching device is about 0.03%. These statistics show that the switching network (TDX-PS) of the conventional paging system is quite stable in terms of call completion rate.

However, in the conventional paging system, the voice mail system (VMS) providing voice information is unstable, and thus the frequency of failure of the subscriber's voice file is high. There was an uncomfortable disadvantage in terms of network management.

Therefore, a new high-speed paging system (APS: Advanced Paging System) has been studied to improve the disadvantages of the conventional paging system.

The fast paging system is configured in the form of a distributed system and provides a graphical operator interface. In addition, the use of a general-purpose computer with an open structure has a number of advantages, such as scalability of the system, ease of service development.

However, due to the characteristics of the distributed system, there is a high possibility of failure for each component and difficult management. This disadvantage is an important threat to the stability of the system, and can be said to be a relative weakness of the high-speed paging system as compared to the call loss rate of the conventional paging system.

Therefore, in order to solve the above problems, the present invention stores the call packet using the message queue in transmitting the call packet processed by the subscriber matching device (IPS) to the call processing device (MCS), and then operates. The subscriber matching device and the call processing station can perform reliable high-speed call service by preventing call loss by reading the call packet from the queue and transmitting it to the call processing device only when the connection with the mode call processing device (MCS) is valid. Its purpose is to provide a method for transmitting interdental call packets.

1 is a schematic configuration diagram of a fast paging system to which the present invention is applied.

2 is a software functional block structure diagram of a subscriber registration device to which the present invention is applied.

3 is a flowchart illustrating a method of transmitting a call packet between a subscriber matching device and a call processing device according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Paging exchanger (TDX-PS)

2: Subscriber matching device (IPS: Intelligent Peripheral System)

3: LAN switch

4, 5: call processing device (MCS: Main Control System)

6: router

7: Redundant Array of Independent Disks (RAID)

8: Operation and Maintenance Center (OMC)

In order to achieve the above object, the present invention provides a method of transmitting a call packet between a subscriber matching device and a call processing device in a high speed paging system, wherein when a call request signal is received, a call packet including subscriber information is generated and then placed in a message queue. A first step of storing the generated call packet; A second step of checking a connection state with the operation mode call processing device and reconnecting if the connection is not normally made; A third step of reading a call packet stored in a queue and transmitting the stored call packet to the call processing device when the connection with the operation mode call processing device is normally maintained; Step 4: If the transmission of the call packet is successful, read the remaining call packets and repeatedly transmit them, and if the call packet fails to send, release the current connection state and attempt to reconnect with the normal call processing device. Characterized by including five steps.

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

1 shows a schematic diagram of a distributed high speed paging system to which the present invention is applied.

One high-speed paging system includes a large number of subscriber matching devices (IPS) 2, redundant call processing devices (MCS) 4 and 5, and an operation and maintenance center (OMC) for operation maintenance; 8).

The subscriber matching device (IPS) 2 receives a calling subscriber number input through a public switched telephone network (PSTN), searches a database for its processing, and collects additional information from the caller according to the result. In order to transmit the announcement and to perform a scenario processing for providing a corresponding service to generate a call request packet, and transmits the packet to the call processing unit (MCS) (4, 5).

The high-speed paging system can have up to 30 IPSs (2), and one IPS (2) can be equipped with up to 8 E1 cards, with one E1 line being 30 Provide a channel. In addition, one group (IPS: IPS Group) is formed including two subscriber point matching devices (IPS) 2, and the two subscriber point matching devices (IPS) 2 have a function of backing up each other. In other words, even if one of the two IPS (2) service is interrupted due to a failure, the other IPS requests the user's call processing on behalf of the other through the switchover by the bypass path of the exchange. Received to handle. In this case, due to the problem of voice file processing, the subscriber matching device (IPS) 2 provides only a numeric call service when it is not its subscriber.

In addition, one IPS 2 has two Identical Local Area Network (LAN) cards to back up each other, and as a disk device, a RAID (Redundant Array of By using Independent Disk 7), subscriber information files and voice files are stored, thereby overcoming the instability of the file system of the conventional voice mail system.

Subscriber matching devices (IPS) 2 are connected to redundant call processing devices (MCS) 4 and 5 and operation and maintenance devices (OMC) 8 via LAN switches 3. In addition, a router 6 is provided for connection with other high speed paging systems to provide wide area services.

2 is a block diagram of a call processing related software functional block of an IPS according to the present invention.

The subscriber matching device (IPS) processes the R2 signal input through the E1 trunk connected to the paging exchange (TDX-PS) to deliver a call processing request to the call processing device (MCS) in real time, and performs various subscriber services. In addition, it receives and processes various control and operation commands of the operator, and periodically reports the status information of the IPS. The following describes the functions of the call processing process.

IPPNR < RTI ID = 0.0 > (IPPNR < / RTI >) 23, which is a process and resource management block, is a master process of IPS, and performs each process and resource management of IPS. In other words, after starting by the initial process at IPS booting, each subprocess is started, memory to be shared between processes is read, and the necessary data is read from the database of the call processing system (MCS). Initialize the resource. Here, if the sub process is restarted even when abnormally terminated for various reasons, the service is managed without interruption by switching the redundant LAN card of the IPS.

The IPS Communication Server (IPCS) 21, which is the communication server of the subscriber matching device, processes the communication between the subscriber matching device (IPS) and the call processing device (MCS) and monitors network conditions. The IPCS 21 transmits a message of each process by accessing the operation mode (Active) / Standby mode (MCS) and TCP (Transmission Control Protocol). The IPCS 21 attempts to connect to all possible connection ports until it is first driven by the IPPNR 23 and until a connection is made with an active mode call processing apparatus (Active MCS). When the connection with the operation mode call processing device (Active MCS) is completed, the connection is continuously checked. In addition, the IPCS transmits all the call request information of the fast paging system and the suitability check request of the number to be registered when registering the group call and the notification room call to the call processing device (MCS). If it is determined that there is a problem with the network, it invalidates the current connection and attempts to reconnect.

IPOCS (IPS Oracle Communication Server) 22, which is a communication server with a database, is a module that processes all queries for operating a database in a call processing device (MCS) at an IPS. And connect using SQL * Net. This is mainly used for setting system configuration information of the IPPNR 23, call processing and subscriber service processing of the IPS (IPS Port Client) 27, and the like. The IPOCS 22 is operated when the connection between the subscriber matching device (IPS) and the operation mode call processing device (MCS) is completed and terminates when a network failure occurs during the service, and when the network is in a normal state, the IPPNR 23 is operated. It restarts by and attempts to connect to SQL * Net by extracting the SQL * Net service name of the active call processing unit (MCS).

The IPOM OMC Communication Server (IPOMCCS) 24, which is a server that performs communication between the subscriber matching device and the operation maintenance device, is a block that performs communication between the subscriber matching device (IPS) and the operation maintenance device (OMC). The IPOMCCS 24 communicates with the operation maintenance device (OMC) using the INET User Datagram Protocol (UDP), receives and processes various control commands and operation messages, and periodically transmits a system status information or a failure message when a failure occurs. It performs the function.

An IPS Communication Server (IPSCS) 29 is a block for performing communication between an IPS and a living information server. This also connects to the living information server via INET UDP and delivers a message requesting inquiry and modification of living information subscribers. The actual database operation is performed by the life information server that receives this message.

ALARMIF (26) reads the contents of the shared memory that records the alarm status of the subscriber registration device (IPS) periodically and sends them to the OMC and the alarm processing unit, and serial communication with the alarm processing unit. To check the alarm condition. Each fault is written to shared memory by the process that caused it, and after a fault recovery, the fault content of the shared memory is initialized.

IPPC (IPS Port Client) 27 processes the R2 signal input through the E1 channel at the exchange, requests a database query to the IPOCS 22 according to the scenario, performs announcement according to the result, calls request and It generates various statistical information and transmits the call packet to the call processing device (MCS) through the IPCS (21). In addition, it performs tasks for voice file management and various channel management.

The timer 28 provides a timer function for performing R2 signal processing and unexpected error processing. The timer 28 communicates with the IPPC 21 using UDP, and notifies the IPPC 27 when the set time elapses. The timer 28 has a function of setting and releasing time.

3 is a flowchart illustrating a method of transmitting a call packet between an IPS and a MCS according to the present invention.

It is also important to minimize the impact in the event of a failure and to continue the service in order to build a stable system. It is important.

When the IPS 27 receives a call request signal for this purpose, the subscriber matching device (IPS) stores the packetized call request message in a queue through a database search and authentication process (101 to 101). 103). The queue uses a message queue provided by Unix as part of inter-process communication (IPC). The default limit of the queue provided by the original system varies slightly from system to system, but for the System V series subscriber matching device (IPS), it is set to 8,192 bytes per message and 16,384 bytes per message queue. have. These values were adjusted based on the size of the call information message packet and the number of call processing in the design specification.

One call request signal is transmitted as a packetized call message. The call request signal is 192 bytes in size. The call request signal includes a reception connection (destination) information, statistical information, various additional service setting information, channel information, and the like.

In the design specification, one IPS processes five call request signals per second. In addition, it is estimated that it takes up to 60 seconds for the transfer of the redundant call processor (MCS). Therefore, a maximum of 12 seconds (4 LAN cards x 3) is required for establishing an active connection, i.e., a connection with an operation mode call processing device, in an IPS after switching a redundant call processing device (MCS). Seconds). With this criterion, we reset the limit of the message queue size in the IPS. The following calculates the minimum queue size needed to store the call request packet by calculating the process from the call processing device (MCS) to the switchover to perform the newly active connection.

Minimum number of call messages that can occur during a switchover

= (MCS transfer time + active connection setup time) x 5 = 360

Minimum message queue size = 360 x 8192 bytes = 2M bytes

Therefore, the message queue should be set to at least 2M bytes. However, considering that the failure state can be maintained longer than the above switching time according to the system failure factor, the IPS currently uses 10,285,760 bytes, about 10M, of the maximum storage capacity of one message queue, which is a system configuration variable. Set to bytes.

The following describes a process of a subscriber matching device transmitting a call packet to a call processing device.

When the IPPC receives the call request signal, the IPPC constructs a call packet through a database search and authentication process and transmits the call packet to the IPCS (101, 102). After receiving the call information packet, the IPCS unconditionally stores the packet in the message queue of the corresponding channel (103) and executes the main loop. Looking at the operation of the main loop, first checks the connection state with the operation mode call processing device (MCS) (104) to determine whether the call processing device (MCS) can process the call packet (104). As a result of the check, if the connection status with the operation mode call processing apparatus is abnormal, the active connection is retried to confirm whether the connection with the operation mode call processing apparatus has been successfully performed (105, 106). If reconnection with the operation mode call processing device fails, a failure processing is performed (107). If the connection with the operation mode call processing device is normally maintained or made, it is checked whether a call packet stored in the queue exists (108). If there is at least one call information packet in the check result queue, the call packet is read from the queue and transmitted to the call processing apparatus (109). If the transmission result is successful (110), the process of reading and transmitting all the messages in the queue is repeated, and if a failure occurs during the transmission, canceling the activated connection state and then retrying the activated connection (111).

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and alterations are possible within the scope without departing from the technical spirit of the present invention. It will be clear to those who have knowledge of

The present invention made as described above can be easily implemented by using a message queue provided by a UNIX system, and when a connection failure with a call processing apparatus (MCS) or a system failure of the call processing apparatus itself occurs, the system can be quickly detected. By preventing call loss until this normal state and processing the call when the system is in a normal state, it can minimize call loss and increase call completion rate and provide reliable high speed call service to subscribers. It works.

Claims (2)

A method of transmitting a call packet between a subscriber matching device and a call processing device in a high speed paging system, A first step of generating a call packet including subscriber information when a call request signal is received, and storing the generated call packet in a message queue; A second step of checking a connection state with the operation mode call processing device and reconnecting if the connection is not normally made; A third step of reading a call packet stored in a queue and transmitting the stored call packet to the call processing device when the connection with the operation mode call processing device is normally maintained; A fourth step of sequentially reading the remaining call packets and repeatedly transmitting the call packets once the call packets have been successfully transmitted; and A method of transmitting a call packet between a subscriber matching device and a call processing device in a fast paging system, comprising a fifth step of, if the call packet transmission fails, releases the current connection and attempts to reconnect with the normal call processing device. The method of claim 1, The call packet is, A method of transmitting a call packet between a subscriber matching device and a call processing device in a high speed paging system, comprising destination information, statistical information, various additional service setting information, and channel information.

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