KR20030071410A - Deplexing-treating method for prossessing SS7 layer3 in BSC - Google Patents

Abstract

PURPOSE: A duplex process method for a processor which processes an SS(Signaling System No. 7) layer 3 in a BSC(Base Station Controller) is provided to prevent the loss of call process association data when the processor is switched by operating the processor by an active-standby structure. CONSTITUTION: An SCCP(Signaling Connection Control Part) receives a CR/CC(Connection Request/Connection Confirm) associated with call connection from an active side. The SCCP transmits an SST(Subsystem Test), and receives an SSA(Subsystem Allowed) which is response with respect to the SST. An MTP3(Message Transfer Part 3) requests a CR primitive to an MTP2, and receives a CC primitive. The MTP2 generates an SLTA(Signal Link Test Acknowledgement) message without transmitting an SLTM(Signal Link Test Message) to a remote station, and transmits the SLTA to the MTP3.

Description

Deduplication-treating method for prossessing SS7 layer3 in BSC

The present invention relates to a control station of a mobile communication system, and more particularly, to operate a processor (Common Signaling Block) for processing the S7 layer 3 in the control station in an active-standby structure, the processor is switched to each other The present invention relates to a duplication processing method of a processor processing an S7 layer 3 at a control station so that call processing related data can be operated without loss of data.

1 is a block diagram of a general mobile communication system.

As shown in FIG. 1, the mobile station 1 communicates wirelessly with the base station 2, and in particular, a mobile call is possible. The base station 2 communicates with the mobile station 1 wirelessly under the control of the control station 3, and the control station 3 controls the base station 2. The exchange station 4 switches the signal transmitted from the mobile station 1 to another station or another communication network, and switches the signal transmitted from the other station or another communication network to the mobile station 1 side.

In such a general CDMA mobile communication system, since the service area is divided into cellular compartments, hand-off occurs when the mobile station moves from one service area (area A) to another service area (area B).

The handoff that occurs here is a soft handoff, which means that when a mobile station moves from one cell to another cell, it simultaneously communicates using two traffic channels allocated from both base stations at the cell boundary. In soft handoff, the mobile station establishes a call path with both base stations.

As such, since the mobile station occupies two traffic channels in the handoff region, the use efficiency of the traffic channel is reduced at the base station. For this reason, assuming the same number of traffic channels per base station, the call drop rate in a mobile communication system providing a soft handoff service is increased.

On the other hand, in the control station, a Signaling System No. 7 (SS7) block composed of MTP1 (Message Transfer Part 1), MTP2, MTP3 and Signaling Connection Control Part (SCCP) is formed.

Here, MTP1 of the PS7 is a physical layer (Phisical Layer1) that defines the electrical and functional characteristics of the signal data link, MTP2 is the error detection and correction between the two signal points through the signal data link, the order message and the signal link It corresponds to the data link layer (Layer2), such as monitoring errors, and MTP3 defines the transfer functions and procedures common to the independent operation of individual signaling data links, and maintains normal message processing capability according to the signal network conditions. It is a network layer (Layer3) that performs the signaling network management function for the signaling layer, and the SCCP (Signalling Connection Control Part) is used for the transmission of non-line correspondence signals, and signaling information or maintenance and transportation information for additional services such as inquiries between databases. Call connection control layer for transmitting the.

2 is a schematic diagram of the surroundings connected to MTP1, 2, 3 and SCCP in the control station.

As shown in FIG. 2, a Call Control Processor (CCP) 102, a call processing processor having an IOS 100, is called a SCCP / MTP3 108 provided in a Common Signaling Board (CSB) 104. Send it.

In addition, the SCCP / MTP3 108 transmits a call to the MTP2 / 1 110 and the Stack Manager 112 connected to an exchange (not shown).

In particular, the SM 112 reports the status of each layer, reports it to a base station manager (BSM) 114, and receives various MMC (Man Machine Command) commands to perform this command to each layer. Do it.

Accordingly, the call of the CCP transmits the call to the SA connecting the CCP and the CSB, and the SA transmits the call to the mobile switching center (MSC), which is a large country through SCCP, MTP3, 2 and 1.

However, in order to process the layer 3 layer in the SS7 existing in the control station as described above, but the processor was processed by hardware, there was a problem that the hardware processor is not redundant due to the replacement of the processor and the operating system, etc. .

Accordingly, an object of the present invention is to provide a processor (Common Signaling Block) for processing the S7 layer 3 in the control station Active-Standby The present invention provides a duplex processing method of a processor for processing the S7 layer 3 by a control station to operate in a structure and to operate without loss of call processing related data when the processors are transferred to each other.

A feature of the dual processing method of the processor for processing the PS7 layer 3 in the control station according to the present invention for achieving the above object,

In the processing method of the S7 layer 3 of the control station having a standby side, active side, SCCP and MTP1, 2, 3,

If only standby side works normally,

Signaling Connection Control Part (SCCP) comprises the steps of receiving data (Connection Request / CR) associated with the call connection from the active side;

The SCCP transmits a SubSystem Test (SST) to save a Subsystem, and receives SSA (SubSystem Allowed) in response to the SST;

The MTP3 sends a CR primitive to the MTP2 and receives a CC primitive;

The MTP2 includes a step of creating a Signal Link Test Ack (SLTA) message on its own without transmitting a Signal Link Test Message (SLTM) to a power station and transmitting the same to the MTP3.

1 is a block diagram of a general mobile communication system;

2 is a schematic diagram of the surroundings connected to MTP1, 2, 3 and SCCP in the control station;

3A is a flowchart illustrating an operation on a standby side of a duplex processing method of a processor processing a BS7 layer 3 in a control station according to the present invention;

3B is a flowchart illustrating an operation on an active side of a duplication processing method of a processor processing a BS7 layer 3 in a control station according to the present invention.

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

100: IOS

102: CCP

104: CSB

108: SCCP and MTP3

Hereinafter, a preferred embodiment of a duplication processing method of a processor processing a BS7 layer 3 in a control station according to the present invention will be described with reference to the accompanying drawings.

3A is a flowchart illustrating an operation on a standby side of a duplex processing method of a processor processing a BS7 layer 3 in a control station according to the present invention.

As shown in FIG. 3A, in the initial loading of the standby side, first, the SCCP of the standby side transmits an SST (SubSystem Test) in order to normally process a call processing message by putting a subsystem in an IN-Service state and responding thereto. It creates SSA (SubSystem Allowed) internally and sends it back to SCCP, bringing Subsystem into IN-Service state.

Thereafter, the SCCP receives data related to the call connection (Connection Request / CR) from the active side.

On the other hand, MTP3 sends a CR primitive and receives a CC primitive to MTP2. That is, the MTP3 normally sends down the CR primitive to the MTP2 on the active side, but does not send down to the MTP2 on the standby side, but instead forms a CC primitive and sends it back to the MTP3. Thus, the virtual No. 7 link is enabled.

The MTP2 does not transmit a SLTM (Signal Link Test Message) to a power station, but instead generates a SLTA (Signal Link Test Ack) message and transmits it to MTP3.

Therefore, when the standby side has an error on the active side and needs to act as the active side, information on SCCP Connection-oriented (Class 2) messages is needed to process the signaling message that was processed by the previous active side. . In the case of SCCP connectionless messages, there is no need to have information on the standby side because it does not send a specific message for each call, but in the case of SCCP connection-oriented messages, a control block is created for each call separately. There is a need to transfer information from the active side to the standby side since it processes.

3B is a flowchart illustrating an operation on an active side of a duplication processing method of a processor processing a BS7 layer 3 in a control station according to the present invention.

As shown in FIG. 3B, when the CR message is received from the active side to the power station, when the CC message is received, the normal call is connected.

Thus, while the control block is operating normally, the active side sends information about this call connection to the standby side.

Even in this case, communication is performed using IPC.

In particular, the standby side uses this information when a transfer is made so that it can continue to maintain the call connection without losing information about the call that has already been connected.

Therefore, when loaded to the standby side, it is requested to transmit information about the call to the active side. At this time, the communication between the two processors uses IPC. In particular, during initial loading, it operates in the same manner as the above operation, but transmits information on a connected call even when two processors are normally operating.

As described above, the present invention has an effect of operating call processing related data without loss by duplexing the processor for processing the SS7 layer 3 of the control station in software.

In particular, if two processors are operating with two processors, the other processor can immediately deal with them.

Claims (2)

In the processing method of the S7 layer 3 of the control station having a standby side, active side, SCCP and MTP1, 2, 3, If only standby side works normally, Signaling Connection Control Part (SCCP) comprises the steps of receiving data (Connection Request / CR) associated with the call connection from the active side; The SCCP transmits a SubSystem Test (SST) to save a Subsystem, and receives SSA (SubSystem Allowed) in response to the SST; MTP3 requests CR primitives to MTP2 and receives CC primitives; The MTP2 does not transmit a SLTM (Signal Link Test Message) to the power station, but generates a SLTA (Signal Link Test Ack) message and transmits it back to the MTP3. Dual processing method of processing processor. In the processing method of the S7 layer 3 of the control station having a standby side, active side, SCCP and MTP1, 2, 3, If only active side works normally, Receiving a CC message after transmitting a CR message to a power station; And a step of transmitting call connection data corresponding to the call to the active side.