KR100466585B1 - Connection Information Consistency Guarantee Method between Distributed Control Processors in RNC of Mobile Communication System - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for ensuring connection information consistency between control processors distributed in a control station of a mobile communication system.

2. The technical problem to be solved by the invention

According to the present invention, a control algorithm of a mobile communication system for ensuring consistency of connection information managed for each distributed control processor by immediately executing a recovery algorithm when a discrepancy of connection information occurs due to a hardware failure or a software error occurs. It is an object of the present invention to provide a method for ensuring connection information consistency between control processors and a computer-readable recording medium recording a program for realizing the method.

3. Summary of Solution to Invention

The present invention provides a method for guaranteeing connection information consistency between control processors distributed in a control station of a mobile communication system, in order to transmit a control message and a signaling protocol message or to transmit user traffic according to a mobile subscriber's call when the system is initialized. Setting and releasing a switch connection to establish and release an asynchronous transfer mode (ATM) switch connection; In the event of a failure of the access control unit (ACP) during operation of the system, according to whether the previously stored connection information is lost, the first connection that ensures the connection information consistency by real-time deleting data between the processors having distributed connection information Ensuring information consistency; Upon failure and recovery of the switch control unit (SCP) during operation of the system, depending on whether or not the previously stored connection information is lost, the connection information set to match the data among the processors distributed and having the connection information related thereto to the normal state Restoring a second connection information consistency to restore connection consistency; And in case of failure of the ATM interface unit (AIM) during operation of the system, releases the connection state between the switch control unit and the access control unit in real time, and resets the initial control path associated with the AIM when transitioning to the normal state to match the connection information. And a third step of ensuring consistency of connection information.

4. Important uses of the invention

The present invention is used in a mobile communication system.

Description

Connection Information Consistency Guarantee Method between Distributed Control Processors in RNC of Mobile Communication System}

The present invention relates to a technology for ensuring connection information consistency between control processors distributed in a control station of a mobile communication system. More particularly, the present invention relates to distributed information by immediately executing a recovery algorithm when a connection failure occurs due to a hardware failure or a software error. A computer-readable recording record of a method for ensuring consistency of connection information between control processors distributed in a control station of a mobile communication system for ensuring consistency between connection information managed for each controlled processor and a program for realizing the method. It is about the medium.

The network control structure up to now has been provided in the form of a monolithic combination of hardware performing a transport layer function for transmitting information and control software performing a network service by protocol processing and routing. Therefore, most of the control software must be changed in parallel when changing the hardware, and when adding a new service, it has a close relationship with the existing processing, resulting in a high ripple effect and an increase in development cost. In addition, various services have been provided by forming a separate network for each service, but in recent years, an integrated service network has been developed to integrate various multiservices and provide them through a single infrastructure. Open network technologies have emerged to facilitate the adoption of and to facilitate the introduction of new forwarding and control technologies.

Standard switch control that separates calls and connections by defining open interfaces within switching systems around Multiservice Switching Forum (MSF), International Softswitch Consortium (ISC), Internet Engineering Task Forum (IETF), and IEEE Programming Interface Network (PIN) The protocol is actively being researched, and interoperability between communication equipments of various vendors that support these standard interfaces is easy to add new services by separating system-dependent hardware and service control software.

IMT (2000 International Mobile Telecommunication) -2000 Asynchronous Radio Network Controller (RNC) structure was applied to the open switch control concept to separate the control processing unit and the switching processing unit to assign functions to each module, and to manage the interrelated data among the distributed multiple control processors The correspondence between them shall be guaranteed.

Conventionally, when this type of data inconsistency occurs, a busy service is disconnected by performing a release process at the time of detecting a user's out of service state or releasing all connections when one of the related multiple control processors fails. In addition, by applying a method that unconditionally accepts the request of the upper control processor even when the connection resource information inconsistency occurs, the inconsistency caused by the case that can occur within the allowable range during system operation or the discrepancy due to the error of the developer The exact cause of the problem was not found early because the cognition could not be determined.

Therefore, in the current technical field, in order to improve service quality even when a mismatch of inter-processor connection resource information occurs due to a hardware failure or a software error among distributed multiple control processors managing ATM (Asynchronous Transfer Mode) connection information. There is an urgent need for a technology capable of guaranteeing connection information consistency considering the characteristics of performance functions.

The present invention has been proposed in order to meet the above-mentioned demands. The present invention provides an agreement between the connection information managed for each distributed control processor by immediately executing a recovery algorithm when a connection failure occurs due to a hardware failure or a software error. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for ensuring consistency of connection information between distributed control processors in a control station of a mobile communication system and a computer-readable recording medium storing a program for realizing the method. Other objects and advantages can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

1 is an exemplary configuration diagram of an IMT-2000 asynchronous RNC to which the present invention is applied;

2 is a configuration example of a configuration of an ATM switch and a matching system between processors to which the present invention is applied;

3A is a flowchart illustrating an embodiment of an ATM connection establishment process within an RNC in a method for ensuring consistency of connection information between distributed control processors according to the present invention;

3B is a flowchart illustrating an embodiment of an ATM connection release process in an RNC of a method for ensuring consistency of connection information between distributed control processors according to the present invention;

4A is a flowchart illustrating a process of matching connection information when an ACP board failure occurs in an access controller in a method for ensuring connection information consistency between distributed control processors according to the present invention;

4B is a flowchart illustrating a process of matching connection information when an SCP board failure occurs in a switch controller in a method for ensuring connection information consistency between distributed control processors according to the present invention;

4C is a flowchart illustrating a process of matching AIM board failure occurrence and recovery connection information of an ATM interface unit in a method of ensuring connection information consistency between distributed control processors according to the present invention;

5A is a flowchart illustrating a process of recovering when a connection resource mismatch occurs between an access controller and a switch controller in a method for ensuring consistency of connection information between distributed control processors according to the present invention;

FIG. 5B is a flowchart illustrating a process of recovering a connection resource mismatch between an AIM of a switch controller and an ATM interface in a method of ensuring connection information consistency between distributed control processors according to the present invention.

* Explanation of symbols for the main parts of the drawings

21: control unit 211: access control unit

212: Operational Maintenance Unit (OMP) 213: Remote Operation Maintenance Unit (R-OMS)

214: access routing unit (ARP) 215: remote alarm processing unit (RAGM)

22: switching unit 221: switch control unit (SCP)

222: ATM interface unit 223: ATM switching unit (ASM)

The method of the present invention for achieving the above object, in the method of ensuring the connection information consistency between the control processor distributed in the control station of the mobile communication system, during the system initialization, the transmission of control messages and signaling protocol messages or the call generation of the mobile subscriber A switch connection establishment and release step of establishing and releasing an asynchronous transfer mode (ATM) switch connection for transferring user traffic according to the present invention; In the event of a failure of the access control unit (ACP) during operation of the system, according to whether the previously stored connection information is lost, the first connection that ensures the connection information consistency by real-time deleting data between the processors having distributed connection information Ensuring information consistency; Upon failure and recovery of the switch control unit (SCP) during operation of the system, depending on whether or not the previously stored connection information is lost, the connection information set to match the data among the processors distributed and having the connection information related thereto to the normal state Restoring a second connection information consistency to restore connection consistency; And in case of failure of the ATM interface unit (AIM) during operation of the system, releases the connection state between the switch control unit and the access control unit in real time, and resets the initial control path associated with the AIM when transitioning to the normal state to match the connection information. And a third step of ensuring consistency of the connection information. The present invention further provides a switch control unit when the connection information is inconsistent with the switch control unit SCP and the access control unit ACP. Report the remaining connection information to the access control unit to analyze the cause of the inconsistency, request the connection release using the same, delete the inconsistent connection information remaining in the switch control unit, and connect the connection information between the switch control unit and the access control unit. And further comprising a fourth connection information consistency step of matching the In addition, the present invention, when the connection information mismatch between the switch control unit (SCP) and the ATM interface unit (AIM), by setting the connection in the ATM interface unit with the connection information received from the switch control unit And a fifth connection information consistency assurance step of matching the connection information between the switch control unit and the ATM interface unit by executing a recovery algorithm in real time only when a mismatch occurs to delete the mismatched connection in the ATM interface unit and reflect the new connection request. Characterized in that made.

On the other hand, the present invention, in the mobile communication system having a processor, when the system is initialized, to establish asynchronous transfer mode (ATM) switch connection for the delivery of control messages and signaling protocol messages or user traffic according to the call generation of the mobile subscriber Switch release on and off function; In the event of a failure of the access control unit (ACP) during operation of the system, according to whether the previously stored connection information is lost, the first connection that ensures the connection information consistency by real-time deleting data between the processors having distributed connection information Information consistency guarantee function; Upon failure and recovery of the switch control unit (SCP) during operation of the system, depending on whether or not the previously stored connection information is lost, the connection information set to match the data among the processors distributed and having the connection information related thereto to the normal state A second connection information consistency guarantee function for restoring the connection information consistency; And in case of failure of the ATM interface unit (AIM) during operation of the system, releases the connection state between the switch control unit and the access control unit in real time, and resets the initial control path associated with the AIM when transitioning to the normal state to match the connection information. A computer readable recording medium having recorded thereon a program for realizing a third connection information consistency guarantee function guaranteeing the security is provided. The present invention also relates to a switch control unit (SCP) and an access control unit (ACP). In case of a connection information mismatch, report the connection information remaining in the switch control unit to the access control unit, analyze the cause of the inconsistency, request the connection release using the same, and delete the mismatched connection information remaining in the switch control unit, and Fourth connection information for matching connection information between the switch control unit and the access control unit; A computer readable recording medium having a program recorded thereon for further realizing a consistency guarantee function is provided. The present invention also provides a method for inconsistent connection information between the switch control unit SCP and the ATM interface unit AIM. By setting the connection in the ATM interface unit with the connection information received from the switch control unit, it deletes the inconsistent connection in the ATM interface unit and drives a recovery algorithm in real time only when a mismatch occurs to reflect the new connection request. A computer readable recording medium having recorded thereon a program for further realizing a fifth connection information consistency guarantee function for matching connection information between interface units is provided.

The IMT-2000 Asynchronous Radio Access Network (RAN) consists of a plurality of Radio Transceiver Systems (RTSs) and Radio Network Controllers (RNCs) .The ATM switch in the RNC is in the RNC. It provides a bearer access function for quickly delivering control information between control processors and mobile multimedia real-time services including text, voice, and video services to subscribers. ATM switch processing is divided into the functions of the control unit and the switching unit by the functional modularity according to the open switch control structure.

In the IMT-2000 asynchronous RNC architecture with the open switch control concept, connection establishment and release request messages are controlled by an access control processor (ACP) or operation maintenance unit (OMP) that acts as a controller based on a unidirectional connection. It is transmitted from the Maintenance Processor to the Switch Control Processor (SCP) in the ATM Switching Unit via the Access Routing Processor (ARP). SCP forwards the connection request message to the input and output ATM Interface Modules (AIM) of the requested connection, and the processing results are sent in the reverse order in which the request message was delivered. Therefore, the connection information in the RNC is distributed and managed by various processors such as ACP, SCP, and AIM, and the consistency of the connection information related to them must be guaranteed.

Inconsistency of data between multiple processors managing connection information due to hardware failure of board during system operation, loss of connection information set for mobile call service or abnormal condition such as IPC (Inter Processor Communication) message transmission error or software error. There is a need to recover from this situation.

That is, if the AIM board is determined to be out of service, the cell can no longer be transmitted, so SCP and ACP immediately release the connection to the AIM and reset the initial control path related to the AIM when it is restored to normal state. Even if the SCP becomes unavailable, the existing connection can continue to deliver traffic if only the AIM and ATM Switching Module (ASM) operate normally. By restoring the information, service continuity is guaranteed. When a specific ACP becomes incapable of service, all call / connection information including billing is deleted, so that the ACP previously requested and released all the connections already established in the ATM switch, so that the charging policy based on the traffic volume accurately provided is supported.

In addition, the connection information may be inconsistent due to an abnormal state such as an IPC message loss or a software error when controlling the connection, which is later connected to a side that remains in use by using a mismatched resource. Requiring this setting will result in repetitive failures, resulting in poor service quality.

In particular, in the case of the residue of a specific connection resource that must be fixedly set in order to provide a mobile communication service, it may be developed into a serious situation in which the service cannot continue anymore.

Accordingly, when a connection request is made from the ACP to the SCP, if there is a connection using the requested resource on the SCP side, the connection failure including the predetermined connection information in the SCP is notified, and the ACP reports the inconsistency using the reported information. By performing proper diagnosis function to identify and analyze the cause, and requesting disconnection again by using the remaining connection information in the informed SCP, the connection remaining inconsistent between ACP and SCP is deleted, and then the normal connection establishment process is processed. Is done.

When requesting connection from SCP to AIM AIM should set connection information received from SCP even if there is a connection using the requested resource to delete new connection request while deleting inconsistent connection in AIM.

Since ACP and SCP are based on unidirectional connection where input and output AIMs are managed as a pair, in case of inconsistency of connection information between ACP and SCP, the remaining connection information in SCP is notified to ACP and the procedure to match under the control of ACP AIM stores only some information on the input or output side of the unidirectional connection and matches it with the upper control processor, SCP.

When resource waste occurs due to such an abnormal condition, the quality of service or serious service interruption may occur due to connection failure when ATM switch requiring long life is operated for a long time. By applying a recovery algorithm, we guarantee the consistency of connection information among multiple control processors in distributed environment and improve the service quality by increasing the success rate of connection establishment.

As described above, in the present invention, the ACP / SCP / AIM board has become unserviceable due to a failure in the connection establishment and release processing and the distributed processing structure according to the open switch control structure in the IMT-2000 asynchronous RNC for the mobile communication service. Processing of matching connection information between multiple control processors distributed during recovery to a normal state, and matching connection information while reducing connection establishment failure rate when a mismatch occurs due to waste of resource information when establishing a connection between ACP and SCP and between SCP and AIM. Characterized in that the processing is carried out.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of an IMT-2000 asynchronous RNC to which the present invention is applied.

As shown in Fig. 1, in the IMT-2000 asynchronous RNC, the ATM switch 9 is a connection for quickly delivering mobile multimedia real-time and non-real-time services including control information and voice, text, and video services to the subscribers. Perform control functions.

The ATM switch 9 is a switch control unit (SCP) 1 that performs connection control and operation maintenance functions of the ATM switch, and an ATM interface unit (AIM) 2 which performs ATM cell header conversion and cell traffic data collection functions. And an ATM switching unit (ASM) 3 for performing cell routing functions in the ATM switch fabric.

In addition, various RAS (Radio Access System) and control modules are connected through the matching module in the ATM switch. RAS performs matching function with RAS-B (4), which performs splicing with the base station, RAS-T (5), which performs voice and data traffic processing, and CN (Core Network) / GPRS (General Packet Service Network). RAS-N (6), RAS-R (7) performing a G-RNC matching function for handover between adjacent RNC. The Radio Control System (RCS) (8) is an ACP (0-3) that performs mobile call protocol processing and resource management, and OMP and CN / GPRS that perform overall operation management and maintenance of the RNC. An access signaling unit (ASP) for performing 7 signaling protocol processing and an access routing unit (ARP) serving as a controller for ATM switch control.

2 is an exemplary configuration diagram of a configuration of an ATM switch and a matching system between processors to which the present invention is applied.

As shown in FIG. 2, the configuration of an ATM switch and a matching system between processors are divided into a control unit 21 and a switching unit 22.

Herein, the control unit 21 includes an access control unit (ACP0 to ACP3) 211 that performs RNC resource management and mobile call / connection control, an operation maintenance unit (OMP) 212 that performs an operation maintenance function, and an RAN. Remote Operation & Maintenance System (R-OMS) 213 that remotely maintains and manages multiple RTSs and multiple RNCs, and accesses to perform control functions to send and receive control messages to and from ATM switches. A routing unit (ARP) 214 and a remote alarm processing module (RAGM) 215 for remotely processing the alarm of each device in the RAN.

The switching unit 22 includes a switch control unit (SCP) 221 which performs a connection control and operation maintenance function of an ATM switch related to hardware, and an ATM interface unit AIM0 to AIM15 that performs cell header conversion and cell traffic data collection functions. 222 and an ATM switching unit (ASM) 223 that handles cell routing functions within the ATM switch fabric.

Meanwhile, the request for establishing and releasing an ATM switch connection for delivering control messages and signaling protocol messages during system initialization or for transmitting user traffic according to a mobile subscriber's call generation includes an access controller configured with multiple processors in consideration of function sharing and load sharing. 211, one operation maintenance unit / access routing unit / switch control unit 212/214/221, and an ATM interface unit 222 composed of up to 16 interwork with each other.

As such, the ATM connection information in the RNC is distributed and managed in various processors such as the access control unit 211, the operation maintenance unit 212, the switch control unit 221, and the ATM interface unit 222. This should be guaranteed.

3A is a flowchart illustrating an ATM connection establishment process within an RNC of a method for ensuring connection information consistency between distributed control processors according to the present invention, wherein one connection establishment request message includes an access control unit 211 and an access routing unit ( 214, the switch controller 221 is sequentially transmitted, and the switch controller 221 transmits the connection setup request message to the input and output ATM interface unit 222 of the requested connection, and processes the response. The request messages are made in the reverse order in which they were delivered.

The access control unit 211 or the operation maintenance unit 212 may include unidirectional multi-connection information in one connection establishment request message to facilitate user convenience and reduce the number of IPCs. Since the switch control unit 221 is configured based on the Open Standard Switch Control Protocol (GSMP), which is an open standard switch control protocol, the access routing unit 214 decomposes and transmits the message in the form of a single unidirectional connection, and the access routing unit 214. When the transaction identifier from the switch controller 221 receives the same response message, the transaction identifier is reassembled into the multiple connection setup response message and notified to the access control unit 211 or the operation maintenance unit 212.

As shown in FIG. 3A, when the access controller 211 requests input connection and output side connection identifiers and connection characteristics as a result of the mobile call / connection control, the access routing unit 214 requests the multi-connection setup (301). The message is decomposed into a form, and a new connection establishment request (Add Branch) message is newly constructed (302), and the switch controller 221 requests a single connection establishment (303).

Accordingly, the switch control unit 221 checks the parameter error of the received connection identifier (304), routing resource allocation and self-routing information in each unit switch of each stage for ATM cell routing (Routing-tag) is generated (305).

In addition, when the switch controller 221 requests the AIM connection to the input side ATM interface unit 222 (306), the ATM interface unit 222 receives a routing table (RT), a usage parameter control (UPC), and a USRX (UTOPIA Switch Receive). In operation 307, connection information is set in a routing control memory corresponding to a virtual path identifier (VPI) / virtual channel identifier (VCI) of a corresponding input cell in the device. At this time, the routing tag is included in 6 bytes added in front of the 53-byte cell. Since 3 bits of routing tags are used for each stage of the 3-stage switch, a total of 9 bits of information is used for routing of the 3-stage switch. 222 notifies the switch control unit 221 of the AIM connection establishment process result (308).

Then, the switch control unit 221 requests the AIM connection to the output ATM interface unit 222 at the same time as the AIM connection request to the input ATM interface unit 222 (309), and corresponds to the corresponding device in the USTX (UTOPIA Switch Transmit Processor) device in the AIM. The priority and the output port number of the UTOPIA switch are stored in a memory corresponding to the VPI / VCI of the output cell (310), and the ATM interface unit 222 notifies the switch control unit 221 of the result of the AIM connection establishment process. (311).

Subsequently, when connection establishment notification is completed from the input and output ATM interface unit 222, connection information such as input / output connection identifier, allocation band, priority, routing tag, etc. related to the connection set in the connection information table in the switch control unit 221 is stored. In operation 312, the access routing unit 214 notifies the result of the single connection establishment.

Then, the access routing unit 214 is reassembled into a multi-connection establishment response message (314) when the transaction identifier is received with the same response message, and notifies the access control unit 211 or the operation maintenance unit 212 to the result of the multi-connection establishment. In step 315, the terminal enters an end state, and thereafter, traffic information of the user may be transmitted.

3B is a flowchart illustrating an ATM connection release processing process in a RNC of a method for ensuring connection information consistency between distributed control processors according to the present invention, wherein one Delete Branch message may correspond to a connection establishment request message; Similarly, the access control unit 211, the access routing unit 214, and the switch control unit 221 are sequentially transmitted, and the switch control unit 221 transmits a connection release request message to the input and output ATM interface unit 222 of the requested connection. Is processed, and the response of the result is made in the reverse order in which the release request message is delivered.

The access control unit 211 or the operation maintenance unit 212 includes unidirectional multiple connection information in one connection release request message for the convenience of the user and to reduce the number of IPCs. The access routing unit 214 and the switch control unit are included. Since the configuration is based on the general switch management protocol (GSMP), which is an open standard switch control protocol, the controller 221 is transmitted to the switch controller 221 through the access routing unit 214 in the form of a single connection in multiple directions.

Then, the switch controller 221 notifies the access routing unit 214 by reassembling the multiple connection release response message when the transaction identifier completes receiving the same response message. That is, the switch control unit 221 is associated with the input and output ATM interface unit 222 during one unidirectional disconnection processing, and the connection belonging to the same message is required to simultaneously perform the processing of multiple connections included in one message. Generates the content of the message to be responded to by the access routing unit 214 according to the response result to the ATM interface unit 222 associated with the.

As shown in FIG. 3B, when the access controller 211 requests the release of multiple connections to the access routing unit 214 by designating the input side and output side connection identifiers as a result of the mobile call / connection control, the access routing unit 214 In this case, the switch control unit 221 requests the multi-connection release (322), and the switch control unit 221 may include a plurality of one-way connection release requests in one message so that the connection release is processed in a single connection form (323). .

In addition, the switch controller 221 checks the parameter error of the received connection identifier (324) and recovers the link resources occupied for ATM cell routing (325).

In addition, when the switch controller 221 requests the AIM connection release from the input side ATM interface unit 222 (326), the ATM interface unit 222 performs routing corresponding to the VPI / VCI of the corresponding input cell in the RT, UPC, and USRX devices. The connection information set in the control memory is released (327) and the switch control unit 221 is notified of the AIM connection release processing result (328).

Accordingly, when the switch control unit 221 requests the AIM disconnection from the output ATM interface unit 222 simultaneously with the AIM disconnection request from the input ATM interface unit 222 (329), the ATM interface unit 222 sends the USTX device. In response to the VPI / VCI of the corresponding output cell, the set priority and the output port number of the utopia switch are released (330). The switch control unit 221 notifies the AIM connection release processing result (331).

On the other hand, when the connection release notification is received from the input and output ATM interface unit 222, the information set in the connection information table in the switch control unit 221 is deleted (332), and the transaction identifier responds from the same ATM interface unit 222. When the message is received and repeatedly completed for the various one-way connections included in the message (333), the multi-connection release response message is transmitted from the switch controller 221 to the access routing unit 214 (334).

Then, the access routing unit 334 notifies the access control unit 211 or the operation maintenance unit 212 of the result of the multiple connection release to make the connection termination state (335) so that the user's traffic information cannot be transmitted afterwards (335). 336).

4A is a flowchart illustrating a process of matching connection information when an ACP board failure occurs in an access control unit 211 in a method for ensuring connection information consistency between distributed control processors according to the present invention. If connection information is lost due to occurrence, data must be quickly deleted and matched between processors having distributed and related connection information. In other words, if a specific ACP board becomes unavailable due to a failure, all charging related information is deleted. Therefore, it supports the charging amount based on the traffic volume accurately used by releasing all the connections already established in the switch. .

As shown in FIG. 4A, when a failure occurrence processing request of a specific ACP board is received from the operation maintenance unit 212 through the access routing unit 214 to the switch control unit 221 (401), the ACP previously requested The set connection information is extracted (402) and the AIM connection to the ATM interface unit 222 is requested (403).

When the ATM interface unit 222 performs the AIM disconnection processing (404) and notifies the switch control unit 221 of the processing result (405), the ATM interface unit 222 completes the reception from the AIM of the input and output ATM interface units 222 in the connection information table. Delete (406). It is repeatedly performed until all connections related to the ACP are deleted (407). Upon completion, the completion of ACP board failure processing is notified to the operation maintenance unit 212 through the access routing unit 214 (408). When the failure of the ACP board is restored, normal processing of the new connection request is performed.

4B is a flowchart illustrating a process of matching connection information when an SCP board failure occurs in the switch controller 221 of a method for ensuring connection information consistency between distributed control processors according to the present invention. If connection information is lost due to occurrence, it must be distributed and match data among processors that have related connection information. When the switch control unit 221 transitions to the out of service state, the new connection request is treated as a failure, but since the established connection is capable of continuous traffic forwarding if only the AIM and the ATM switch unit 223 of the ATM interface unit 222 operate normally. By restoring the connection information in the switch control unit 221 using the information stored in the ATM interface unit 222 upon restarting to a normal state, the service continuity is guaranteed.

In this way, if the SCP board of the switch control unit 221 is restored in a short time, it does not cause any disruption to the connection during the service, thereby improving the quality of service. However, if the SCP board does not operate normally, it is impossible to provide subsequent services, so immediate action is necessary, and prompt action by the operator should be taken into consideration and it is composed of redundancy. When the subscriber of the connection established during the restoration process is released, the ACP connection information in the access control unit 211 is deleted but remains in the AIM of the ATM interface unit 222.

Later, when restoring the SCP board of the switch control unit 221, the connection information is reset by using the AIM information of the ATM interface unit 222, so that inconsistency of the connection information may occur between the access control unit 211 and the switch control unit 221. This is solved by a recovery processing algorithm when a connection information mismatch occurs between the access control unit 211 and the switch control unit 221.

As shown in FIG. 4B, upon instantaneous failure and recovery of the SCP board of the switch control unit 221, the access routing unit 214 is notified to the access routing unit 214 to disable the state of the SCP. Thereafter, upon receiving the connection request message from the access control unit 211, the access routing unit 214 rejects (412) and notifies the switch control unit 221 that the SCP restart processing start message has been received (413).

Accordingly, the switch control unit 221 requests the connection information in the AIM preset to the AIM of all the ATM interface units 222 (414) and the ATM interface unit 222 extracts the connection information set in the AIM based on the one-way connection. (415) When notifying the preset connection information in the AIM (416), the switch control unit 221 restores the connection information in the switch control unit 221 using the information received from the AIM of all the ATM interface units 222, and then in the SCP. The connection information generation completion is determined (417).

Subsequently, when the generation of the connection information in the SCP is completed, the switch control unit 221 is restored to the state before restarting, so that the access routing unit 214 notifies the end of the SCP restart processing (418) to enable the state of the SCP again. After the connection request message is received, the process is normally performed (419), and the switch control unit 221 notifies the reception of the SCP restart processing termination message (420).

4C is a flowchart illustrating a process of matching AIM board failure occurrence and recovery connection information of an ATM interface unit 222 in a method for ensuring connection information consistency between distributed control processors according to the present invention, wherein AIM is not available for service. When the cell is no longer transmitted, the switch control unit 221 and the access control unit 211 quickly release the connection connected to the corresponding AIM and reset the initial control path associated with the AIM when the system transitions to the normal state. .

As shown in FIG. 4C, when the access control unit 211 managing the AIM receives a failure request processing of a specific AIM from the operation maintenance unit 212 (421), the access control unit 421 associates with the AIM. All established connections are released (422) and the corresponding AIM is disabled. From then on, the connection request to the AIM is rejected by the access control unit 211 (423). (424).

Accordingly, when the switch control unit 221 receives a failure request processing of a specific AIM from the operation maintenance unit 212 through the access routing unit 214 (425), the switch control unit 425 establishes a connection associated with the corresponding AIM. The information is extracted (426) and the connection request is made to the AIM of the ATM interface unit 222 (427).

In addition, if the connection established AIM associated with the failed AIM is performed by the ATM interface unit 222 (428), the switch control unit 221 notifies the switch control unit 221 of the processing result (429). (430) and repeatedly performs until all connections related to the corresponding AIM are completed. Upon completion, the AIM failure processing completion is notified to the operation maintenance unit 212 through the access routing unit 214 (431). .

As such, when a failback of a specific AIM is notified from the operation maintenance unit 212, an initial control path related to this should be reset. The switch control unit 221 receives the PVC setup request (432) and requests the AIM connection setup to the ATM interface unit 222 (433).

Accordingly, the ATM interface unit 222 performs the AIM connection establishment process (434) and notifies the switch control unit 221 of the processing result (435). The switch control unit 221 registers it in the connection information table (436). The PVC resetting process result is notified to the operation maintenance unit 212 via the access routing unit 214 (437).

FIG. 5A is a flowchart illustrating a process of recovering when a connection resource mismatch occurs between an access control unit 211 and a switch control unit 221 in a method for ensuring connection information consistency between distributed control processors according to the present invention. If a mismatched resource is available in the access control unit 211 after a mismatch between multiple control processors due to a loss of a message or an abnormal state caused by a software error, requesting connection establishment using this causes a repetitive failure. . In particular, in the case where the residue of the connection resource that must be fixedly set to provide the mobile service remains, a serious situation in which the service can no longer be provided occurs.

As shown in FIG. 5A, when the access control unit 211 requests connection establishment from the switch control unit 221 (501), the switch control unit 221 investigates a parameter error (502), and the requested connection is switched to the switch control unit 221. Investigate whether the information has already been set (503), and if predetermined, extracts predetermined connection information (504) and notifies the access control unit 211 of the connection processing failure message including the same through the access routing unit 214 (505). .

Accordingly, the access control unit 211 uses the connection information existing in the switch control unit 221 as the analysis data of the cause of the inconsistency (506) and the remaining connection in the switch control unit 221 included in the connection establishment failure message. By generating a connection release message using the information (507), the access control unit 211 serving as the master of the connection control requests the release of the duplicated connection to the switch control unit 211 (508), the slave of the connection control The switch control unit 221 performing the role requests the AIM connection release to the ATM interface unit 222 (509).

Then, the ATM interface unit 222 performs the AIM connection release process (510) and notifies the switch control unit 221 of the processing result (511). Accordingly, the switch control unit 221 deletes the connection information table (512) and notifies the access control unit 211 of the connection release processing result via the access routing unit 214 (13). By deleting the connection remaining inconsistent in the switch control unit 221, the connection information between the access control unit 211 and the switch control unit 221 coincides and thereafter operates normally.

FIG. 5B is a flowchart illustrating a process of recovering when a connection resource mismatch occurs between the switch control unit 221 and the ATM interface unit 222 in the method for ensuring consistency of connection information between distributed control processors according to the present invention. If a mismatched resource is available in the switch control unit 221 after a mismatch between multiple control processors due to an abnormal state caused by a software error or an IPC message is lost during processing, it is repeatedly failed when requesting connection establishment using this. Cause. In particular, when a connection request is made from the switch control unit 211 to the AIM of the ATM interface unit 222, even if a connection exists in the ATM interface unit 222 using the connection information requested by the switch control unit 221 which manages the connection control. The connection information is processed to match the connection information between the switch processing unit 221 and the AIM of the ATM interface unit 222.

As shown in FIG. 5B, when the switch control unit 221 receives a connection establishment request through the access routing unit 214 according to a request of the access control unit 211 (521), the AIM is connected to the input side ATM interface unit 222. Request setup (522).

Accordingly, in the AIM of the input-side ATM interface unit 222, the connection required for setting connection information in the routing control memory corresponding to the VPI / VCI of the corresponding input cell in the RT, UPC, and USRX devices is connected to the ATM interface unit 222. It checks whether the AIM is preset in the AIM (523), sets the recently requested value even if it is preset (524), and notifies the switch control unit 221 of the result of the AIM connection establishment process (525).

Therefore, when the switch control unit 221 requests the AIM connection to the output ATM interface unit 222 (526), the AIM of the output ATM interface unit 222 stores the memory corresponding to the VPI / VCI of the corresponding output cell in the USTX device. In order to set the priority and the output port number of the utopia switch, it is checked whether the required connection is preset in the AIM (527), and even if it is preset, it is set to the recently requested value (528), and the processing result is set to the switch controller ( 221) (529).

Then, the switch control unit 221 registers this in the connection information table (530) and notifies the access control unit 211 of the connection setting processing result via the access routing unit 214 (531).

As described above, according to the present invention, data consistency is maintained in the shortest time between processors having associated connection information even in the event of hardware failure and recovery of a board during system operation between multiple control processors in an IMT-2000 asynchronous RNC. Ensure maximum service continuity.

In case of connection control, IPC message may be lost or anomalous conditions such as software error may cause residue of connection resource.If connection connection processor requests connection establishment using inconsistent resources, it will fail repeatedly. As a result, the service quality deteriorates and the accumulation of inconsistent resources can lead to severe service interruption when operating an exchange system requiring a long service life for a long time. Accordingly, by driving the connection information consistency guarantee algorithm in consideration of the functional characteristics of the control processor that is immediately driven only when a discrepancy occurs, the success rate of the connection process is improved and the quality of service is improved.

Therefore, the present invention proposes a method of matching connection information between distributed multiple control processors in case of inconsistency due to hardware failure or software error in the architecture applying the open switch concept in the IMT-2000 asynchronous RNC. As a similar phenomenon occurs in one communication system, it is applicable.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

As described above, the present invention has an effect of ensuring consistency between connection information managed for each distributed control processor by immediately executing a recovery algorithm when a connection failure occurs due to a hardware failure or a software error.

That is, according to the present invention, there may be a waste of connection resources due to loss of IPC message or abnormal state such as software error when controlling system connection, and connection information consistency considering the functional characteristics of the control processor which is immediately driven only when a mismatch occurs. By driving the guarantee algorithm, it is possible to increase the success rate of connection processing and to improve the quality of service.

Claims (6)

In the method of ensuring connection information consistency between control processors distributed in a control station of a mobile communication system, Setting and releasing a switch connection setting and releasing an asynchronous transfer mode (ATM) switch connection for system control and signal protocol message transmission or user traffic transmission according to a mobile subscriber's call generation at system initialization; In the event of a failure of the access control unit (ACP) during operation of the system, according to whether the previously stored connection information is lost, the first connection that ensures the connection information consistency by real-time deleting data between the processors having distributed connection information Ensuring information consistency; Upon failure and recovery of the switch control unit (SCP) during operation of the system, depending on whether or not the previously stored connection information is lost, the connection information set to match the data among the processors distributed and having the connection information related thereto to the normal state Restoring a second connection information consistency to restore connection consistency; And In the event of a failure of the ATM interface unit (AIM) during operation of the system, the connection state between the switch control unit and the access control unit is released in real time, and when the transition to the normal state resets the initial control path associated with the AIM connection information consistency Third connection information consistency step of guaranteeing Method for ensuring consistency of connection information between control processors distributed in a control station of a mobile communication system comprising a. The method of claim 1, In case of inconsistency in the connection information between the switch control unit SCP and the access control unit ACP, the connection information remaining in the switch control unit is reported to the access control unit, and the cause of the inconsistency is analyzed, and the connection release is requested again using the connection control unit. A fourth connection information consistency assurance step of deleting the mismatched connection information remaining in the switch control unit and matching the connection information between the switch control unit and the access control unit; The method of guaranteeing connection information consistency between control processors distributed in the control station of the mobile communication system further comprising. The method of claim 1, In case of inconsistency in connection information between the switch control unit (SCP) and the ATM interface unit (AIM), a connection in the ATM interface unit is established using the connection information received from the switch control unit, thereby deleting a mismatched connection in the ATM interface unit. A fifth connection information consistency guarantee step of matching a connection information between the switch control unit and the ATM interface unit by driving a recovery algorithm in real time only when a mismatch occurs to reflect a connection request; The method of guaranteeing connection information consistency between control processors distributed in the control station of the mobile communication system further comprising. In a mobile communication system having a processor, A switch connection establishment and release function for establishing and releasing an ATM switch connection for system control, signal transfer, control protocol and signaling, or user traffic according to a mobile subscriber's call generation; In the event of a failure of the access control unit (ACP) during operation of the system, according to whether the previously stored connection information is lost, the first connection that ensures the connection information consistency by real-time deleting data between the processors having distributed connection information Information consistency guarantee function; Upon failure and recovery of the switch control unit (SCP) during operation of the system, depending on whether or not the previously stored connection information is lost, the connection information set to match the data among the processors distributed and having the connection information related thereto to the normal state A second connection information consistency guarantee function for restoring the connection information consistency; And In the event of a failure of the ATM interface unit (AIM) during operation of the system, the connection state between the switch control unit and the access control unit is released in real time, and when the transition to the normal state resets the initial control path associated with the AIM connection information consistency Third connection information consistency guaranteeing function A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 4, wherein In case of inconsistency in the connection information between the switch control unit SCP and the access control unit ACP, the connection information remaining in the switch control unit is reported to the access control unit, and the cause of the inconsistency is analyzed, and the connection release is requested again using the connection control unit. A fourth connection information consistency guarantee function for deleting the mismatched connection information remaining in the switch control unit and matching the connection information between the switch control unit and the access control unit; A computer-readable recording medium that records a program for further realization. The method of claim 4, wherein In case of inconsistency in connection information between the switch control unit (SCP) and the ATM interface unit (AIM), a connection in the ATM interface unit is established using the connection information received from the switch control unit, thereby deleting a mismatched connection in the ATM interface unit. A fifth connection information consistency guarantee function for matching the connection information between the switch controller and the ATM interface unit by executing a recovery algorithm in real time only when a discrepancy occurs to reflect a connection request; A computer-readable recording medium that records a program for further realization.