KR101117830B1 - Method for Service Redirection on Dual Down of MSC Main Processor - Google Patents

Abstract

The present invention relates to a method of operating a first mobile communication system for service switching to a second mobile communication system when the switch main processor of the first mobile communication system is dual down.

In the method for service switching of the present invention, as the main processor (BMP) of the base station controller forming the number seven signal link with the switch main processor (MP), the switch main processor of the redundant structure is dual-down, the number seven A first step of recognizing a fail for a signal link; A second step of the base station controller blocking communication with each base station accommodated in the base station controller; Including, the base station controller main processor when the main processor down by allowing the base station that is aware of this due to the virtual shutdown (Shut Down) processing to transmit a service redirection message including the information of the second mobile communication system In addition, service changeovers are also possible in the event of a dual down of the exchange main processor.

Main Processor, Dual Down, Service Redirection

Description

Method for Service Redirection on Dual Down of MSC Main Processor}

1 is a mobile communication network configuration for explaining a conventional service redirection method,

2 is a block diagram of a mobile communication network for explaining the present invention;

3 is a flowchart illustrating a service switching method according to an embodiment of the present invention;

4 is a flowchart illustrating a service switching method according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: base station (BTS)

120: base station controller (BSC)

121: BSC main processor (BMP)

130: exchanger (MSC)

131: exchanger main processor (MP)

The present invention relates to a method for service switching during dual down of a switch main processor. More specifically, when a main processor of a redundant structure is dual down in a 1X switch in an area in which 1X and 2G networks are overlaid, a 2G network is rapidly changed. The present invention relates to a method for enabling service switching.

Code Division Multiple Access (CDMA) is proposed by Qualcomm in the United States and standardized by the Telecommunication Industry Association (IS-95) and is the most widely used digital mobile communication technology in the world.

The IS-95A, the first CDMA cellular standard, was first published in July 1993 by TIA / EIA IS-95, and became the basis for a 2G (Generation) CDMA system, the wideband 1.25 MHz CDMA channel, power control, call coordination, It describes the structure of hand-off and registration technology for system operation. In addition to the voice service, it provides circuit switched data of 14.4 kbps.

The IS-95B, also called TIA / EIA-95, combines IS-95A and TSB-74 into a single document, and the IS-95B system provides 64kbps packet switched data in addition to voice services. IS-95A and IS-95B are classified as 2G networks.

CDMA2000 1X (also referred to as '1X'), also known as 3G1X or 1XRTT, is the core 3G CDMA2000 technology, labeled 1X to indicate a version of CDMA2000 radio technology that operates on a pair of 1.25MHz radio channels. The 1X service is a step up from the existing IS-95 A / B network, and supports up to 153.6 kbps, which is much faster than the speed supported by the IS-95 A / B network (9.6 kbps / 64 kbps) in existing cellular and PCS. It is a possible service. Therefore, the 1X service enables the improvement of existing voice and WAP (Wireless Access Protocol) service quality and the provision of various multimedia services (AOD, VOD, etc.).

Meanwhile, as shown in FIG. 1, 1X includes a 1X base station (1X BTS, 21), a 1X base station controller (1X BSC, 22), a 1X switchboard (1X MSC, 23), and a 1X base station management device (1X BSM, 24). Overlay area where the system coexists with a 2G base station consisting of a 2G base station (2G BTS, 31), a 2G base station controller (2G BSC, 32), a 2G switchboard (2G MSC, 33), and a 2G base station management device (2G BSM, 34). This is fairly widely distributed.

In such an overlay area, if a service cannot be provided due to a problem of the 1X system, the terminal 10 receiving the service redirection message (SRM) is transmitted from the 1X base station 21 to the terminal 10. By registering the location with the 2G MSC 33 through the 2G BTS 31 of the 2G system, the subscriber can use the 2G service.

On the other hand, the main processor (MP) of the mobile switching center (MSC) configuration to control each sub-processor and the device, and performs the call processing of the subscriber, the main processor that performs such an important function The breakdown will greatly affect the quality of the customer's diminishing quality and the loss of image as a mobile operator.

Therefore, most of the exchanges currently have a redundant structure of the main processor and minimize the downtime by allowing the standby processor (Stand-By Side MP) to operate as an act processor when the act processor (Act Side MP) fails. If a dual down condition occurs where both the act processor and standby processor are down, service redirection should be performed.

However, in the present case, the operator directly turns off the transmission stage (TX) of all base stations overlaid on the base station controller connected to the corresponding exchange by using a tool manufactured for service switching when the main processor is dual down. The service transition of the service is delayed, which causes a lot of inconvenience to the mobile subscribers.

This means that the main processor (BMP) of the base station controller processes the call through the switch main processor (MP) and the number seven signal network, but simply fails for the number seven signaling link on dual down of the switch main processor. This is because it only recognizes (Fail) and has a serious problem of not performing processing for service switching.

In addition, when the main processor (BMP) of the 1X base station controller currently fails, the base station accommodated in the corresponding 1X base station controller transmits a service redirection message. Since this is not provided, it is affecting deterioration of subscriber's quality of experience and loss of image of the mobile communication provider, and the improvement of the function is urgently needed.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, when the 1X switch main processor dual down in the region where the 1X network and 2G network is overlaid, the 2G system quickly without the customer notice By receiving a mobile communication service through, the service gap such as voice transmission, SMS transmission, data transmission does not occur, and the service is continuously provided to maintain the stabilization of the service network.

In particular, the present invention, when the main processor (BMP) of the base station controller recognizes the failure of the number seven signal link with the main exchange processor (MP), by blocking the communication with the base stations managed by the base station controller, The base station of the exchange main processor is configured to make the base station controller main processor recognize that the base station controller main processor is down, so that the service switching can be performed without changing the structure and process of the base station, which is configured to send a service redirection message in case of failure of the base station controller main processor. An object of the present invention is to provide a method for service switching during dual down.

In addition, the present invention uses a Keep Alive signal between the base station controller main processor and the exchange main processor, when there is no response from the switch main processor for a predetermined time, the base station controller communicates with the base stations accommodated in the base station controller. The purpose of the present invention is to provide a method for service switching during dual down of an exchange main processor that enables a base station to automatically send a service redirection message.

In order to achieve the above object, the present invention provides a method of operating a first mobile communication system for service switching to a second mobile communication system when the switch main processor of the first mobile communication system is dual-down, and includes a switch main processor (MP). A first step of the main processor (BMP) of the base station controller forming the number seven signal link, recognizing a fail for the number seven signal link as the switch main processor of the redundant structure is dual down; A second step of the base station controller blocking communication with each base station accommodated in the base station controller; It provides a method for service switching during the dual down of the exchange main processor including a.

In order to achieve the above object, the present invention provides a method of operating a first mobile communication system for service switching to a second mobile communication system when the switch main processor of the first mobile communication system is dual down, and includes a main processor of a base station controller. (BMP), the first step of periodically sending a Keep Alive Signal to the switchboard main processor MP, which forms a number seven signal link with itself; A second step of determining, by the main processor of the base station controller, whether to return a response signal from the switch main processor; A third step of, when the response signal is not returned from the switch main processor, by the base station controller to block communication with each base station accommodated in the base station controller; It provides a method for service switching during the dual down of the exchange main processor including a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, Figure 2 is a block diagram of a mobile communication network for explaining the present invention.

As shown, the mobile communication network is connected to a base station (BTS, 110) that is responsible for transmitting and receiving a wireless section signal with the mobile communication terminal, a base station controller (BSC, 120) for controlling the base station and the base station controller 120 An exchange (MSC) 130 that performs call exchange.

The base station controller 120 includes a base station controller main processor 121 (BMP; BSC Main Processor) responsible for call processing, number seven signal processing, resource management, and ATM link control in the base station controller. The main processor 121 forms a number seven signal link with the main processor 131 of the exchange 130.

The main processor 131 (MP) of the switch 130 controls each subprocessor and a device, and performs an access switching processor (ASP) that performs call processing of a subscriber. It performs functions such as translation, station number and PP control.

Meanwhile, the present invention virtually shuts down the base station controller main processor 121 by recognizing it by the base station controller main processor 121 when the switch main processor 131 takes a dual structure in a dual down state. In step 110, a service redirection message (SRM) is transmitted.

In addition, the present invention proposes two methods for the base station controller main processor 121 to recognize the dual down state of the exchange main processor 131. One is to recognize a fail of the number seven signal link. The other is to use a Keep Alive Signal.

In the former case, the base station controller main processor 131 recognizes that the number seven signal link codes with the switch main processor 121 are all down, and the current base station 110 is the base station controller main processor 131. Since the service redirection message is transmitted when the down, the base station controller main processor 131 processes the virtual shutdown as if down.

In the latter case, the base station controller main processor 131 transmits a periodic keep-alive signal to the exchange main processor 121, and if the response signal is not received for a predetermined time, recognizes it as a dual down and performs a virtual shutdown process. will be.

3 and 4 illustrate the above-described processing method for service switching of the present invention by embodiment.

First, Figure 3 is a flow chart illustrating a service switching method according to an embodiment of the present invention, an embodiment using the number seven signal link fail.

As shown, the base station controller main processor (BMP) of the present invention forms a number seven signal link with the switch main processor (MP), and the switch main processor of the redundant structure is dual down, failing to the number seven signal link. When this occurs (S301), the base station controller main processor (BMP) recognizes a fail for the number seven signal link because all number seven signal link codes (SLC) are down (S302).

In this case, the base station controller of the present invention blocks the communication with each base station accommodated in the corresponding base station controller, and performs a virtual shutdown process (S303). Accordingly, each base station whose communication with the base station controller is disconnected has the base station controller main processor down. Recognizing that the service redirection message (SRM) is transmitted (S304).

The service redirection message includes information of another mobile communication system overlaid with the base station controller in communication with the base station controller, and the terminals receiving the service redirection message use other mobile communication using the information included in the message. Register the system and switch the service.

Next, FIG. 4 is a flowchart illustrating a service switching method according to another embodiment of the present invention, which illustrates a case of using a keep-alive signal.

As shown, in another embodiment of the present invention, the base station controller main processor (BMP) transmits a periodic keep-alive signal to the exchange main processor (MP) using the number seven signal link (S401).

The keep alive signal is a signal transmitted to prevent disconnection and is periodically transmitted in a short time unit.

When a switch alive signal is received from the base station controller main processor, the exchange main processor should transmit an acknowledgment signal to the base station controller main processor to inform the base station controller main processor of normal operation. The main processor determines whether a response signal has been received within a predetermined time (S402).

If the response signal is not received as a result of the determination, the base station controller of the present invention blocks the communication with each base station accommodated in the base station controller, and virtually shuts down the processing (S403). Accordingly, each base station whose communication with the base station controller is disconnected The base station controller main processor recognizes that it is down and transmits a service redirection message (SRM) (S404).

On the other hand, in the drawing, one response signal is returned to one keep-alive signal, and the transmission cycle of the keep-alive signal and the response signal transmission cycle are the same, but the response signal is not returned to the keep-alive signal every time. The response signal may be returned after the keep-alive signal has been transmitted a predetermined number of times (eg, five times).

For example, assuming that the keep-alive signal is transmitted periodically in units of 3 seconds, the exchange main processor may transmit a response signal in units of 15 seconds.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Therefore, according to the method for service switching during dual down of the switch main processor of the present invention, when the 1X switch main processor is dual down in the region where the 1X network and the 2G network are overlaid, the 2G system can be quickly released without the user's knowledge. Since it is possible to receive a mobile communication service through the service, the occurrence of service gaps such as voice transmission, SMS transmission, and data transmission is prevented, and the service network can be stabilized through continuous service provision.

In addition, according to the present invention, when the main processor (BMP) of the base station controller recognizes a failure for the number seven signal link with the switch main processor (MP), the base stations accommodated in the base station controller are recognized as if the base station controller main processor is down. In this case, there is an effect that service switching can be performed without changing the structure and process of the base station, which is configured to transmit a service redirection message when the base station controller main processor fails.

In addition, according to the present invention, by simply transmitting a response signal to a keep alive signal between the base station controller main processor and the exchange main processor, it is possible to easily induce service redirection for dual down of the main exchange processor. It is effective to maintain service without major change of program or program, and stable service can be constructed by improving service redirection function, and high quality service can be provided by stable system operation. It is expected to not only increase the cost, but also contribute to improving the image of the service provider.

Claims (8)

A method of operating a first mobile communication system for switching a service to a second mobile communication system when the switch main processor of the first mobile communication system is dual down, The main processor (BMP) of the base station controller that forms the number seven signal link with the switch main processor (MP) recognizes a fail for the number seven signal link as the switch main processor of the redundant structure is dual down. A first step of doing; A second step of the base station controller blocking communication with each base station accommodated in the base station controller; Method for switching the service during the dual down of the exchange main processor comprising a. The method of claim 1, After the second step, A third step of transmitting, by each base station disconnected from the base station controller, a service redirection message (SRM) including information of a second mobile communication system; Method for switching the service during the dual down of the switch main processor further comprising a. The method according to claim 1 or 2, The exchange main processor (MP), A method for switching services at the time of dual down of an exchange main processor, characterized in that it is an Access Switching Processor (ASP) that controls each subprocessor and device and performs call processing of a subscriber. A method of operating a first mobile communication system for switching a service to a second mobile communication system when the switch main processor of the first mobile communication system is dual down, A first step of the main processor (BMP) of the base station controller periodically transmitting a keep alive signal to the switchboard main processor (MP) forming a number seven signal link therewith; A second step of determining, by the main processor of the base station controller, whether to return a response signal from the switch main processor; A third step of, when the response signal is not returned from the switch main processor, by the base station controller to block communication with each base station accommodated in the base station controller; Method for switching the service during the dual down of the exchange main processor comprising a. The method of claim 4, wherein In the second step, The main processor of the base station controller determines whether to return a response signal from the switch main processor after the keep alive signal has been transmitted a predetermined number of times, and the main processor of the base station controller performs dual down service. Method for the transition. The method of claim 4, wherein After the first step and before the second step, Sending, by the switch main processor, a response signal to the keep-alive signal to the base station controller main processor; Method for switching the service during the dual down of the switch main processor further comprising a. The method according to any one of claims 4 to 6, After the third step, A fourth step of transmitting, by each base station disconnected from the base station controller, a service redirection message (SRM) including information of a second mobile communication system; Method for switching the service during the dual down of the switch main processor further comprising a. The method according to any one of claims 4 to 6, The exchange main processor (MP), A method for switching services at the time of dual down of an exchange main processor, characterized in that it is an Access Switching Processor (ASP) that controls each subprocessor and device and performs call processing of a subscriber.

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