KR970011685B1 - Duplication method of layer 3 in ccp - Google Patents

Abstract

The present invention relates to a layer 3 duplexing method for a signal processor which is in charge of call processing in a control station of code division multiple access (CDMA) mobile system. According to the inventive method, synchronization and release to a call are possible when switching occurs by interrupt in a system performing several calls simultaneously, thus assuring duplexing, and it does not affect adversely the other processors when there occurs interrupt between mobile station, base station, control station and mobile exchanger, continuous call proceeding can be provided after switching.

Description

Layer 3 Redundancy Method of Signal Processing Processor

1 is an environmental configuration of the whole system applied to the present invention.

2 is a block diagram of a message processing processor of the control station of the present invention.

3 is a protocol hierarchy diagram of a message processing processor of the present invention.

4 is a synchronous procedure diagram to help redundancy of the present invention.

5 is a recovery procedure diagram of a message processing processor of the present invention.

The present invention relates to a layer 3 duplication method of a signal processing processor in charge of call processing in a control station of a CMS (CDMA Mobile System).

Redundancy is needed to reliably deliver messages and data in the communications system.

Redundancy can have a significant impact on the performance of a system depending on how and to which subjects it is applied. Also, redundancy is closely related to maintenance and operation.

Redundancy can be divided into hardware redundancy and software redundancy.

Hardware redundancy includes processor redundancy, bus redundancy, board redundancy, power supply redundancy, and software areas include input / output (I / O) driver redundancy, operating system redundancy, and protocol redundancy.

In the conventional communication network, the redundancy scheme has been realized to be limited to either layer 1 or layer 2 of the bearer service among hardware duplication and software. Therefore, when a fault occurs in a system that is processing multiple calls simultaneously, the system is transferred to another system. However, the quality of service is often lowered by hardware initialization or software initialization by not performing ongoing call recovery or continuous service.

In addition, by performing the function of redundancy independently for each device, there was a problem that the initialization must be performed because synchronization of the protocols being executed cannot be performed.

The present invention devised to solve all the problems with the prior art, it is possible to realize the redundancy by synchronizing and recovering up to one call when a transfer due to a failure occurs in a system that is performing several calls at the same time In addition, it can be performed by software without affecting other processors, and layer 3 redundancy method of the signal processing processor that provides continuous call progress even after switching in case of failure between mobile station, base station, control station and mobile exchange. The purpose is to provide.

In order to achieve the above object, the present invention provides a first step of informing a processor that processes layer 3 redundancy in layer 3 in an OCP management layer when a failure occurs in a normally operated CCP and gives a failure message to the other CCP; A second step of sending a status inquiry message and receiving a response message from the base station and the mobile exchange to find out the current status of the base station and the mobile exchange; A third step of sending an additional information message to the base station and the mobile exchange when the necessary information is further required; A fourth step of sending a negotiation message to finally confirm whether to start the rescue when all necessary information is satisfied; A fifth step of, if one CCP is repaired and then mounted, receiving an initialization completion message of one CCP and receiving a download from an operating station, and then initializing completion message to request data after the initialization is completed to the other CCP; A sixth step in which the other CCP sends the data currently being accepted as a data message, sends a data completion message as the last data transmission, and the one CCP sends a data response message; A seventh step of synchronizing the preparation of the layer 3 with the interface between the layer 2 and the lower layer upon receiving all data performed in the same way as the current CCP; An eighth step when one side CCP finally sends a negotiation message confirming that the standby state is ready and restored and completed in a mutual hierarchical relationship, and the other side CCP sends a negotiation completion message; And a ninth step of sending a restart message to be initialized in software when the recovery is impossible.

In order to transmit the information, the control station has two CCPs and takes a simultaneous execution method in which the operation result of the CCP side in operation is written to the memory of the other side as it is.

In the design of layer 3 redundancy, the protocol was implemented with its own layer to promote transparency of the existing protocol layer and to communicate with maintenance-related processors.

The redundancy function is actually performed on the kernel and the redundancy processor is placed in the management layer to perform the protocol with its own messages and information elements.

Message types and information elements are as follows.

(1) Message type

Restart: A message that causes the call processing processor that is in progress to be inoperable to make it idle, which is a software reset.

Duplication_Notify: A message notifying you that a failure has occurred in an active OCP.

Alive: Notified that the failed CCP has finished loading and initialization.

Status: The status inquiry message for status synchronization by the standby OCP to the active CCP.

Response message to the Status_Ack: Status message.

More_Info: Request for additional information.

Response message for More_Info_Ack: More_Info.

Nego: Notifies the completion of the signal processing with the completion of all synchronizations and the continued signal processing.

Response message for Nego_Ack: Nego.

Data: Send all data currently running.

Data_Ack: Means that all data has been received well. Additional information may be requested before this message.

(2) information elements

Message Type

Data length

Data Sequrnce Number

Status Number

Cause

Descriminator

Call idenitification

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram showing the entire system to which the present invention belongs, and includes a mobile station (MS), a base station (BTS), a control station (Base Station Controller: BSC), and an operating station (Base Station Manager: BSM). ), Message Switching Center (MSC), Home Location Register (HLR), Visitor Location Register (VLR), Authentication Center (AC), Billing Center (BC) ) And Maintenance Center (OMC).

A mobile station means a mobile terminal or a vehicle telephone, a base station processes wireless messages, a control station is in charge of management and control of a base station, and an operating station makes base station network operation more efficient, maintenance service improved, and maintenance of high quality communication service. It is in charge of efficient centralized operation of communication network equipment, mobile exchange is in charge of exchange function, home location registration is a database for storing subscriber information, and visiting location registration is mobile station registering its location, authentication center Is responsible for identifying subscribers, the charging center is responsible for billing, and the maintenance center is responsible for the overall maintenance of the mobile communication system.

2 shows a redundant configuration diagram of the message processing processor of the present invention.

The control station has two processors for redundancy: one active processor and one standby processor.

These processors operate independently of each other, and if one side fails, the processors switch to the other side.

Each processor is also connected to a redundant CIN to provide bus redundancy.

The message processing processor is equipped with a processor that handles layer 3 redundancy, and connections to other layers communicate through the kernel.

The protocol is performed with Layer 3 in the BCP of the BTS and the PP of the MSC. 3 is a block diagram illustrating the processor loaded in the CCP of the present invention for each layer.

Each layer handles management functions in the management layer (n-layer manager) in addition to the basic functions of the protocol. In order to communicate with the management layer, each layer must pass through layer management, which serves as a window for communication with the management layer.

Processors that handle layer 3 redundancy are placed in the layer 3 management layer, and the layer 3 management layer also exists in the BCP of the BTS and the PP of the MSC, which are responsible for the counterpart protocols.

4 shows a procedure for switching and synchronizing the CCP, which is the standby state of the present invention, to operate in an active state.

First, the active CCP sends the management layer a failure signal to the waiting CCP, and the management layer sends a duplication notification (Duplication_Notify) message to the layer 3 management that manages the redundancy, and receives a status response message (Status_Ack) from the BTS. In order to synchronize with the MSC as well as synchronize with the MSC, it receives and synchronizes the status response message that sent the status message in the same procedure.

If more information is needed for synchronization, the More_Info message may be first sent to the BTS / MSC to receive an additional information response message from the BTS / MSC.

After receiving all the necessary information, a Negotiation message for final motivation is sent to the BTS to indicate that the transfer is ready.

The CCP receives the negotiation response message sent from the BTS and completes the transfer. Also, the CCP sends the negotiation message to the MSC following the same procedure as the BTS and receives the negotiation response message to synchronize with the MSC.

5 shows a procedure for the active CCP in which the failure of the present invention occurred, to be mounted and restored after the failure is removed.

The active state CCP, which failed to switch over, was mounted after the failure was removed, and first, the active CCP was sent to the currently active CCP to inform that it was remounted.

The implemented CCP receives data from the BSM, initializes it, and then sends an initialization completion message (Init_Ack) to the active CCP again to request the status of the current signal processing processor. The CCP receiving the initialization completion message sends all the data for all the calls that are currently being passed in order.In the case of the implemented CCP receiving the data transmission, if the required data is insufficient, the CCP additionally requests the activation CCP by using an additional information request message. Request data.

After all the information is satisfied, the implemented CCP sends a Data Transfer Complete (DATA_Ack) message to indicate that the data transfer is complete.

Layer 3 then synchronizes the external inputs and interrupts in the lower layer with the queue and sends a negotiation message to indicate that it is ready for recovery. When the negotiation response message is received from the activating OCP, the implemented CCP becomes operational again. The redundancy will continue.

According to the present invention, a system capable of performing multiple calls can be synchronized when a switchover occurs due to a failure, and recovery can be performed up to one call to realize redundancy, and can also be implemented by software. It can be performed without affecting, and in case of a failure between the mobile station, the base station, the control station and the mobile exchange, there is an effect of providing continuous call progress even after the transfer.

Claims (2)

In a duplication method applied to a mobile communication network system including two signal processing processors (hereinafter referred to as CCP) for transmitting a message between a base station and a mobile switching center, a failure occurs in a CCP on one side that operates normally, and a failure message is transmitted to the other side. A first step of notifying the processor which processes layer 3 redundancy in layer 3 in the CCP management layer when given to the CCP; A second step of sending a status query message and receiving a response message from the base station and the mobile exchange to find out the current status of the base station and the mobile exchange; A third step of sending an additional information message to the base station and the mobile exchange when the necessary information is further required; A fourth step of sending a negotiation message to finally confirm whether to start recovery when all necessary information is satisfied; A fifth step of, if one CCP is repaired and then mounted, receiving an initialization completion message of one CCP and receiving a download from an operating station, and then initializing completion message to request data after the initialization is completed to the other CCP; A sixth step in which the other OCP sends data currently being executed as a data message, sends a data completion message as the last data transmission, and the one side CCP sends a data response message; A seventh step of synchronizing the preparation of the layer 3 with the interface between the layer 2 and the lower layer upon receiving all data performed in the same way as the current OCP; An eighth step when one side of the CCP finally sends a negotiation message confirming that the preparation and recovery of the standby state is completed, and the other side of the CCP sends a negotiation completion message; And a ninth step of sending a restart message to be initialized in software when recovery is impossible. The CCP of claim 1, wherein the recovery method of the eighth step includes informing that the active state CCP, which has been switched over due to a failure, is mounted after the failure is removed and is re-mounted by sending a remount signal to the currently active CCP. After receiving and initializing the data from the operating station, and sends an initialization complete message to the CCP, which is active again, and is ready for operation, requesting the status of the current signal processing processor; The CCP receives the initialization completion message and transmits data about all the calls that are currently being communicated in turn.In the case where the CCP receives the data transmission, the CCP additionally sends an active request to the active CCP by requesting additional information. Requesting necessary data; after all the information is satisfied, the mounted CCP sends a data transmission completion message to indicate that data transmission is completed; Layer 3, synchronizing external inputs and interrupts in the lower layer with synchronization with the queue, and sending a negotiation message to indicate completion of recovery; And when the negotiation response message is received from the active CCP, the mounted CCP is in an operation state to continue the redundancy.