CN1434574A - Backup method for mobile exchange center - Google Patents

Abstract

The invention discloses a backup method of a mobile switching center, comprising: adopting the 14-bit A-interface signaling point technology to configure the backup MSC with the 14-bit A-interface signaling point of the backed up MSC; judging whether the backed up MSC is in a fault state , if it is in a fault state, carry out the switchover of the active and standby MSC, so that the backup MSC takes over the business of the faulty MSC; judge whether the faulty MSC returns to normal, and if it returns to normal, deactivate the message transfer part (MTP) and signaling connection of the backup MSC response The signaling state of the control part (SCCP) layer and the relay circuit notify the MSC that has returned to normal to switch to the normal state. Using the above scheme, it can support one-to-many MSC backup mode, so that only one backup MSC in the local network can back up all MSCs in the local network. This method has no requirements for the model and has no impact on other network elements. , so the cost and resource occupation of MSC backup using the present invention are less, and it is easy to implement.

Description

A Backup Method for Mobile Switching Center

technical field

The invention relates to a backup method in mobile switching in a mobile communication system.

Background technique

Due to the uncertainty of natural disasters, the impact on the mobile communication system is also random, so it is necessary to back up the mobile switching center (MSC) in the mobile communication system, so that when the MSC equipment in the system is due to severe natural disasters or other Reasons, such as earthquakes, floods, equipment failures, power supply damage, etc. have caused functional paralysis, and when it cannot be repaired in a short time, its functions will be quickly taken over by another backup MSC device. The currently used MSC backup method is mainly a one-to-one hot backup solution, which provides each operating MSC with a backup MSC, and the base station control center (BSC) is connected to the active MSC through a relay, but When the MSC fails, cut over the trunk connection between the BSC and the active MSC to the standby MSC. In the above solution, the active MSC and the standby MSC communicate through the internal interface defined by each MSC manufacturer. During the operation of the switch, the active MSC transfers the office configuration data and user data to the standby MSC in real time through this interface. Synchronize to ensure the consistency of configuration data and user data of the active and standby MSCs. The main disadvantage of the above solution is that since each MSC needs to be provided with a backup, for the operator, the 1+1 backup to deal with the small probability event such as severe natural disasters will waste a huge amount of investment and communication resources ; Simultaneously, because the current MSC can only support the MSC of the same manufacturer as oneself to carry out the backup, can't carry out the backup to the heterogeneous model, also brought trouble to the actual backup; Processing load, its processing capacity is lower than that of the normal switch without backup.

Contents of the invention

The purpose of the present invention is to provide a backup method of a mobile switching center, the cost and resource occupation of MSC backup using the method are less, and the method is easy to implement.

In order to achieve the above object, the backup method of the mobile switching center provided by the present invention includes:

(1) adopting 14 A interface multi-signaling point technologies to backup Mobile Switching Center (MSC) is carried out by 14 A interface signaling point configurations of backup MSC;

(2) judge whether the MSC being backed up is in a fault state, if in a fault state, carry out the switchover of the active and standby MSCs, so that the backup MSC takes over the business of the faulty MSC;

(3) Judging whether the fault MSC returns to normal, if it returns to normal, deactivate the message transfer part (MTP) of the backup MSC response, the signaling state and the relay circuit of the signaling connection control part (SCCP) layer, and notify the recovery to normal MSC switches to normal state.

The method further includes: establishing a 14-bit A-interface multi-signaling point configuration table in the backup MSC, which includes the 14-bit A-interface signaling point of the backup MSC and the 14-bit A-interface signaling point of the opposite end office.

The step of carrying out the switching of main and standby MSC in above-mentioned steps (2) further comprises:

(a1) cutting off the circuit and signaling link between the faulty MSC and its peer base station controller (BSC);

(a2) adjust the transmission of the A interface, and connect the circuit and the signaling link between the BSC at the opposite end of the faulty MSC and the backup MSC on the physical layer;

(a3) activating the 14 A interface signaling points of the faulty MSC in the backup MSC and the opposite end office signaling points thereof on the standby MSC, and starting the corresponding 14 A interface signaling point operations;

(a4) Adjust cell data so that the standby MSC takes over the cell data originally under the jurisdiction of the faulty MSC.

Above-mentioned step (a4) also comprises:

(b1) Activate the circuits and signaling links between the backup MSC and all backed-up MSC peer BSCs, and place the circuits and signaling links between the backup MSC and all backed-up MSC peer BSCs at the MTP layer and SCCP layer China Unicom;

(b2) Check whether the circuits and signaling links from the backup MSC to other network elements of the system are available, if not, perform circuit activation operations and continue to make corresponding judgments until the above circuits and signaling links enter a normal state.

Above-mentioned step (3) also includes: check whether the MTP signaling link state is in the deactivation state, check whether the SCCP layer destination signaling point and the subsystem state are in the deactivation state, and check whether the corresponding relay circuit is in the unavailable state , only when the above checks are all passed, the MSC that returns to normal is notified to switch to the normal state.

As can be seen from the technical solution adopted by the present invention, the present invention has the advantages of: it can support one-to-many MSC backup mode, and because the one-to-one backup problem of MSC is solved, only one backup MSC is needed in the local network. Backing up all MSCs in the local network saves the investment of the operator and improves the security of the network; 2. It supports the backup of heterogeneous models, and there is no requirement to modify MSCs of different manufacturers; Basic network elements such as base station controller (BSC), MSC, and home location register (HLR) have no influence, do not need to do special cooperation, and the switching process is fast; therefore, the cost and resource occupation of MSC backup using the present invention are less, easy to accomplish.

Description of drawings

Fig. 1 is the embodiment flowchart of the inventive method;

Fig. 2 is a schematic diagram of the inventive method;

Fig. 3 is an example diagram of a networking environment where the present invention is applied.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The backup method of MSC in the present invention can realize the backup of N+1 of MSC, that is, one backup MSC backs up N MSCs in the local network, and when one or more MSCs break down, the backup MSC can quickly take over their business. In order to identify its unique position in the network, each MSC must have its own signaling point code (OPC) on the A interface side and the network side. In my country's GSM standard, the A interface side uses 14 bits, signaling The point attribute is the domestic spare signaling point code. For MSC equipment that does not use the multi-signaling point technology, the MSC has only one unique signaling point code on both the A interface side and the network side. For MSC equipment using multi-signaling point technology, MSC can virtualize multiple signaling points on the A interface side or network side, and each signaling point is considered as its own OPC. For other network elements, each The signaling points still correspond to one MSC entity, and it is unknown whether the physical entities corresponding to these signaling points are the same MSC. Therefore, if the backup MSC can simulate multiple 14-bit A-interface signaling points of the MSCs backed up by it, and complete the management of A-interface circuits, links, and location area cells within the jurisdiction of the simulated A-interface signaling points , it is necessary to adopt the 14-bit A interface signaling point technology in the backup MSC to make it have multiple signaling point functions.

Refer to FIG. 2 for the principle of the method of the present invention. The system described in the figure has three MSCs, MSC1, MSC2 and backup MSC, and the BSCs connected to the above MSCs are BSC1, BSC2 and small-capacity BSC respectively. To enable the backup MSC to take over its services when MSC1 and MSC2 fail, configure the following signaling point data in the backup MSC: local office signaling point Peer Office Signaling Point 0xC1 0xB1 0xC2 0xB2 0xC3 0xB3

The backup MSC can simulate multiple 14-bit A-interface signaling points, which respectively represent the 14-bit A-interface signaling points of multiple MSCs it backs up. For Figure 2, the backup MSC simulates three 14-bit A-interface signaling points, of which 0xC1 simulates the A-interface signaling point of MSC1, 0xc2 simulates the A-interface signaling point of MSC2, and 0xC3 means that the backup MSC is in normal operation, that is, it does not take over other It is the signaling point of the A interface when the MSC fails.

When a certain MSC fails, the backup MSC can be activated in the local office by activating the 14-digit A-interface signaling point owned by the faulty MSC, as a 14-digit A-interface signaling point for the actual operation of the local office. In the case of multiple MSC failures In this case, the corresponding multiple 14-bit A-interface signaling points can be activated, so that the backup MSC can fully simulate the function of the faulty MSC on the A-interface side, and undertake the services of the faulty MSC, without requiring the BSC to modify the office configuration data. In this way, the backup MSC can have the corresponding relationship between the N 14-bit A-interface signaling points simulated by the local office and the connected BSC signaling points, as well as the location area cell information of all backup multiple MSCs.

Fig. 1 is the flow chart of the embodiment of the method of the present invention. The present invention is implemented according to FIG. 1 , and reference is made to FIG. 3 for its networking environment. Step 1: Establish a 14-bit A-interface multi-signaling point configuration table in the backup MSC to configure and manage signaling point data. In the second step, the 14-bit A-interface signaling point technology is used to configure the backup MSC's 14-bit A-interface signaling point for the backup MSC through the configuration table. In this way, the configuration table of the backup MSC includes the 14-bit A-interface signaling point of the backed-up MSC and its opposite end-office signaling point and the backup MSC’s local 14-bit A-interface signaling point and its opposite end-office signaling point . The third step is to activate the 14-bit A-interface signaling point of the backup MSC local office and the corresponding 14-bit A-interface signaling point of the opposite end office. As shown in Figure 3, the backup MSC backs up and protects MSC1 and MSC2, and the backup MSC itself is also connected to the small-capacity BSC, and is kept in the normal working state, and the backup MSC is also in the working state. The 14-bit A interface signaling point data of the network configuration is as follows: network element MSC1 MSC2 Backup MSC BSC1 BSC2 Small capacity BSC signaling point 0xa1 0xa2 0xa3 0xb1 0xb2 0xb3

The signaling point configuration of the 14-bit A interface signaling point configuration table of the backup MSC is as follows: 14-bit A interface signaling point of the local office Signaling point corresponding to BSC Is it active 0xa1 0xb1 no 0xa2 0xb2 no 0xa3 0xb3 yes

It should be noted that, under normal circumstances, that is, when no other MSC fails, the backup MSC does not actually activate although it has the configuration data of the multi-signaling point of the A interface. In this example, although the backup MSC is configured with the A interface signaling point of 0xa1, on the mobile network, the real MSC with the signaling point of 0xa1 is MSC1. Only when MSC1 fails and the backup MSC takes over its network location, the backup MSC activates the 0xa1 signaling point as a 14-bit A interface signaling point that it is using.

In step 4, it is judged whether the backup MSC is in a fault state, and if it is in a fault state, the switchover of the master MSC and the backup MSC is performed, so that the backup MSC takes over the service of the fault MSC. That is to say, during operation, if MSC1 fails, the backup MSC will take over MSC1. The specific takeover steps are as follows:

(a1) cutting off the circuit and signaling link between the faulty MSC and its peer base station controller (BSC), that is, cutting off the circuit and signaling link between MSC1 and BSC1;

(a2) Adjust the transmission of the A interface, connect the circuit and signaling link between the BSC at the opposite end of the faulty MSC and the backup MSC on the physical layer, that is, connect the circuit and signaling link between BSC1 and the backup MSC on the physical layer China Unicom;

(a3) activate the 14-bit A-interface signaling point of MSC1 in the backup MSC and the opposite end office signaling point of the faulty MSC on the standby MSC, and start the corresponding 14-bit A-interface signaling point operation;

(a4) Adjust cell data, so that the backup MSC takes over the fault MSC, that is, the cell data under the original jurisdiction of MSC1. In this step, the circuits and signaling links between the backup MSC and all backed-up MSC peer BSCs, that is, BSC2, are also activated, and the backup MSC is connected to all backup MSC peer BSCs, that is, between BSC2 and BSC2. The circuits and signaling links of the backup MSC are connected on the MTP layer and the SCCP layer; then check whether the circuits and signaling links from the backup MSC to other network elements of the system are available, if not, perform the circuit activation operation and continue to make corresponding judgments until The above circuits and signaling links enter the normal state.

At this time, the backup MSC has two 14-bit A-interface signaling points, as shown in the following table: 14-bit A interface signaling point of the local office Signaling point corresponding to BSC Is it active 0xa1 0xb1 yes 0xa2 0xb2 no 0xa3 0xb3 yes

At this time, the backup MSC believes that the office has two 14-bit domestic backup signaling points on the A interface side: 0xa1 (simulated MSC1) and 0xa3 (originally allocated). However, for BSC1 connected to the faulty MSC, the switching process is unaware. The original information flow interaction between BSC1 and MSC1 is now transferred to the backup MSC, which takes over the location of the faulty MSC on the network and the responsibilities assumed by the backup MSC. services, and the switching process is completed.

Since the present invention can carry out one-to-many backup, when MSC2 also fails, the above steps can be repeated. At this time, the backup MSC has three 14-bit A interface signaling points: 0xa1, 0xa2, 0xa3, as shown in the following table : 14-bit A interface signaling point of the local office Signaling point corresponding to BSC Is it active 0xa1 0xb1 yes 0xa2 0xb2 yes 0xa3 0xb3 yes

In this way, the backup MSC will undertake the services of the original MSC1 and MSC2 at the same time.

It should be noted that, due to how quickly the transmission (relay circuit, signaling link) is switched between BSC1 and the backup MSC in the present invention, completing the physical layer Unicom is the key to whether the transmission dispatching process can be completed quickly. Whether the backup MSC can quickly take over the business of the faulty MSC, in the implementation process of the present invention, the circuit and the signaling link between the BSC at the opposite end of the faulty MSC and the backup MSC are connected on the physical layer in the above-mentioned step (a2). When the BSC and MSC share the local transmission network equipment, execute the transmission equipment jumper batch command through the transmission maintenance terminal, and directly switch the trunk of the 14-bit A interface of the faulty MSC to the backup MSC; when the BSC and MSC are directly interconnected, the The time slot crossover device performs automatic switching time slot adjustment, thereby completing the communication on the physical layer.

The 5th step, judge whether faulty MSC returns to normal, if return to normal, deactivate the message transfer part (MTP) of backup MSC response, the signaling status and the relay circuit of signaling connection control part (SCCP) layer, notify to return to normal The MSC switches to normal state. In this step, also check whether the MTP signaling link state is in the deactivated state, check whether the SCCP layer destination signaling point and the subsystem state are in the deactivated state, and check whether the corresponding relay circuit is in an unavailable state, Only when the above checks are all passed, the normal MSC is notified to switch to the normal state.

The key of the present invention is to adopt the 14-bit A interface multi-signaling point technology in the backup MSC, thereby realizing the one-to-many backup of the MSC. In the process of master and backup switching due to MSC failure, the BSC of the existing network does not need to be modified. Configuration data, so that fast switching can be realized during the backup process.

Claims (9)

1. A backup method for a mobile switching center, comprising: (1) adopting 14 A interface multi-signaling point technologies to backup Mobile Switching Center (MSC) is carried out by 14 A interface signaling point configurations of backup MSC; (2) judge whether the MSC being backed up is in a fault state, if in a fault state, carry out the switchover of the active and standby MSCs, so that the backup MSC takes over the business of the faulty MSC; (3) Judging whether the fault MSC returns to normal, if it returns to normal, deactivate the message transfer part (MTP) of the backup MSC response, the signaling state and the relay circuit of the signaling connection control part (SCCP) layer, and notify the recovery to normal MSC switches to normal state. 2. The backup method of the mobile switching center according to claim 1, characterized in that said method also includes: setting up a 14-bit A-interface multi-signaling point configuration table in the backup MSC, including the local office 14 of the backup MSC in the table One A interface signaling point and its peer end office 14 A interface signaling point. 3. The backup method of the mobile switching center according to claim 2, characterized in that said 14-bit A-interface multi-signaling point configuration table also includes: the 14-bit A-interface signaling point of the back-up MSC and its peer office 14 A interface signaling point. 4, the backup method of mobile switching center according to claim 3, it is characterized in that described method also comprises: before described step (2), activate backup MSC local office 14 A interface signaling points and its opposite end office 14 It is the signaling point of interface A. 5, the backup method of mobile switching center according to claim 1, it is characterized in that described step (2) carries out the step that the switchover of main and standby MSC further comprises: (a1) cutting off the circuit and signaling link between the faulty MSC and its peer base station controller (BSC); (a2) adjust the transmission of the A interface, and connect the circuit and the signaling link between the BSC at the opposite end of the faulty MSC and the backup MSC on the physical layer; (a3) activating the 14 A interface signaling points of the faulty MSC in the backup MSC and the opposite end office signaling points thereof on the standby MSC, and starting the corresponding 14 A interface signaling point operations; (a4) Adjust cell data so that the standby MSC takes over the cell data originally under the jurisdiction of the faulty MSC. 6, the backup method of mobile switching center according to claim 5 is characterized in that described step (a4) also comprises: (b1) Activate the circuits and signaling links between the backup MSC and all backed-up MSC peer BSCs, and place the circuits and signaling links between the backup MSC and all backed-up MSC peer BSCs at the MTP layer and SCCP layer China Unicom; (b2) Check whether the circuits and signaling links from the backup MSC to other network elements of the system are available, if not, perform circuit activation operations and continue to make corresponding judgments until the above circuits and signaling links enter a normal state. 7, the backup method of mobile switching center according to claim 5 is characterized in that in the described step (a2), the circuit and the signaling link between the BSC of the faulty MSC opposite end and the backup MSC are connected on the physical layer, When the BSC and MSC share the local transmission network equipment, the relay of the 14-bit A interface of the faulty MSC is directly switched to the backup MSC by executing the transmission equipment jumper batch command through the transmission maintenance terminal. 8, the backup method of mobile switching center according to claim 5 is characterized in that in the described step (a2), the circuit and the signaling link between the BSC of the faulty MSC opposite end and the backup MSC are connected on the physical layer, When the BSC and the MSC are directly interconnected, the time slot crossover device automatically switches the time slot adjustment to complete the communication on the physical layer. 9, the backup method of mobile switching center according to claim 1, it is characterized in that said step (3) also comprises: check whether MTP signaling link state is in deactivation state, check SCCP layer purpose signaling point and subsystem Whether the state is in the deactivated state, and check whether the corresponding relay circuit is in the unavailable state, and only after the above checks are passed, the MSC that returns to normal is notified to switch to the normal state.

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