CN1882107B - A Method for Realizing Dual Homing of Signaling Gateway in Next Generation Network - Google Patents

Abstract

The invention discloses a method for realizing dual-homing of a signaling gateway in a next-generation network, which includes: setting a mutual assistance relationship between the first and second switching devices, and respectively setting the first source signaling point on the two switching devices; The signaling gateway interacting with the first source signaling point is connected to the first source signaling point on the two switching devices, and a first connection between the signaling gateway and the first source signaling point on the first switching device is set The priority is higher than the second connection with the first source signaling point on the second switching device; after the signaling gateway receives the signaling message that the destination signaling point is the first source signaling point, it judges whether the first connection is Available, if available, perform signaling interaction with the first source signaling point on the first switching device through the first connection; otherwise, perform signaling with the first source signaling point on the second switching device through the second connection interact. The method of the invention can improve the reliability of the next generation network without reducing the equipment utilization rate.

Description

A method for realizing dual-homing of signaling gateways in next-generation networks

technical field

The invention relates to a technology for improving the reliability of the next generation network, in particular to a method for realizing the double-homing of a signaling gateway (SG) in the next generation network. the

Background technique

The next generation network is a new network integrating voice, data, fax and video services. In order to solve the problem of low processing efficiency caused by the simultaneous processing of media data and signaling data by the IP gateway in the past, the next generation network regards signaling processing and media data conversion as a separate module to realize the separation of call control and service bearer. Thereby improving the efficiency of the call. In the next generation network, SG is a gateway that receives and sends signaling messages between the SS7 network and the network implementing softswitch, and relays, translates or terminates the signaling messages. Fig. 1 has described the position of SG in the next generation network. As shown in Figure 1, the SG is respectively connected to the No. 7 signaling network and the switching equipment of the soft switch to realize the signaling interaction between the two networks. the

In order to improve the reliability of next-generation network signaling transmission, the 1+1 backup mechanism is usually adopted for the switching devices in the softswitch in the design. The network diagram of the 1+1 backup for the switching devices in the softswitch is shown in Figure 2 shown. As shown in Figure 2, the 1+1 backup refers to configuring a disaster recovery device for a specific switching device in the softswitch, wherein the specific switching device is called the active switching device, and the disaster recovery device is called the standby switch equipment, because the signaling interaction between switching devices is realized through signaling points, therefore, it is necessary to configure the same signaling point in the active switching device and the backup switching device, such as signaling point a, and at the same time Connections are established between all SGs connected to the active switching device and the standby switching device. In this case, if the active switching device works normally, the signaling point on the SG and the signaling point a of the active switching device perform signaling interaction, and the standby switching device is idle at this time; if the active switching device fails , the SG will switch to the standby switching device to interact with the signaling point a of the standby switching device; and when the active switching device recovers from the failure, the SG will switch back again and communicate with the signaling point a of the active switching device Point a performs signaling interaction. the

The above-mentioned method for backing up the switching device can greatly improve the reliability of the next generation network, but the above-mentioned 1+1 backup method for the switching device has the following disadvantages:

First, since the standby switching device is idle when the active switching device is normal, there are problems of redundant waste and low utilization rate of the switching device. the

Second, when the active switching device fails, for the SG connected to it, it is equivalent to the failure of all the links between the signaling point on the SG and the signaling point on the active switching device. Other signaling points in the first-generation network can no longer access the signaling point of the active switching device through the SG, such as signaling point a, that is, for other signaling points in the network , it can sense that the signaling point a of the active switching device fails. Subsequently, when the link between the signaling point on the SG and the standby switching equipment signaling point a is established, other signaling points in the next generation network can access the signaling point of the standby switching equipment through the SG again a. Therefore, the communication between other signaling points in the network and signaling point a has a process from failure to recovery, and smooth switching between the master and backup switching devices cannot be realized. the

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a method for realizing dual-homing of signaling gateways in next-generation networks, which can not only improve the utilization rate of switching devices in softswitches while ensuring the reliability of next-generation networks; Realize the smooth switching of SG between switching devices. the

The signaling gateway dual-homing method of the present invention comprises:

A method for realizing dual-homing of signaling gateways in next-generation networks, characterized in that,

Set the first and second switching devices to have a mutual aid relationship, and set the first source signaling point on the first and second switching devices respectively; set the second source signaling point on the first and second switching devices respectively. Source signaling point; there is a mutual assistance relationship between the first source signaling point and the second source signaling point on each switching device;

All signaling gateways that will interact with the first source signaling point are respectively connected to the first source signaling point on the first and second switching devices, and corresponding to each signaling gateway, set the signaling gateway and The priority of the first connection between the first source signaling point on the first switching device is higher than the priority of the second connection between the first source signaling point on the second switching device;

All signaling gateways that will interact with the second source signaling point are respectively connected to the second source signaling point on the first and second switching devices, and corresponding to each signaling gateway, set the signaling gateway and The priority of the first connection between the second source signaling point on the second switching device is higher than the priority of the second connection between the second source signaling point on the first switching device;

After each signaling gateway receives the signaling message whose destination signaling point is the first source signaling point, it judges whether the first connection with the first source signaling point on the first switching device has a higher priority Available, if available, perform signaling interaction with the first source signaling point on the first switching device through the first connection with the first source signaling point on the first switching device; otherwise, through the first connection with the first source signaling point on the first switching device; The second connection between the first source signaling point on the second switching device performs signaling interaction with the first source signaling point on the second switching device;

After receiving the signaling message whose destination signaling point is the second source signaling point, each signaling gateway judges whether the first connection with the second source signaling point on the second switching device with higher priority is available , if available, perform signaling interaction with the second source signaling point on the second switching device through the first connection with the second source signaling point on the second switching device; otherwise, through the first connection with the second source signaling point on the second switching device The second connection between the second source signaling point on a switching device performs signaling interaction with the second source signaling point on the first switching device. the

The first connection with the first source signaling point on the first switching device in the present invention is the connection between the signaling point on the signaling gateway and the first source signaling point on the first switching device link;

The second connection with the first source signaling point on the second switching device is a link between the signaling point on the signaling gateway and the first source signaling point on the second switching device. the

The method of the present invention further includes: the first connection with the first source signaling point on the first switching device is a signaling point between the signaling point on the signaling gateway and the first source signaling point on the first switching device. direct routes between points;

The second connection with the first source signaling point on the second switching device is between the signaling point on the signaling gateway and the first source signaling point on the second switching device, passing through the first The detour route for the transfer of the second source signaling point on the second switching device. the

In the present invention, performing signaling interaction with the first source signaling point on the second switching device through the second connection with the first source signaling point on the second switching device includes:

The signaling gateway sends the uplink signaling message to a second source signaling point on the second switching device through a detour route with a lower priority; the second source signaling point sends the uplink signaling message Forwarding to the first source signaling point on the second switching device;

The first source signaling point on the second switching device sends the downlink signaling message to the second source signaling point of the second switching device, and the second source signaling point forwards the downlink signaling message to the The above signaling gateway. the

The method of the present invention further includes: after the signaling gateway receives the signaling message from the first source signaling point of the first and second switching devices at the same time, according to the priority of the connection, select to receive the signaling message from the source signaling point with a lower priority The signaling message of the first connection with the first source signaling point on the first switching device is high, and the signaling message from the second connection with the first source signaling point on the second switching device with lower priority is discarded. order news. the

As can be seen from this, applying the method described in the present invention will have the following beneficial effects:

First, when a switching device fails, the business of the faulty switching device can be processed by the switching device that has a dual-homing relationship with it. The equipment works under normal conditions, therefore, the method of the invention can improve the utilization rate of the switching equipment. the

Secondly, when a switching device fails, although the SG interacting with it can detect that the switching device has failed, it does not think that the destination signaling point of the signaling message is unreachable, but can pass the lower priority The link or route sends the signaling message to the switching device that has a mutual assistance relationship with the faulty switching device. For other signaling points in the network, there is no communication process from failure to recovery, so SG can be realized. Smooth switching. the

Finally, in the SG dual-homing implementation method based on routing priority, since there is no need to set redundant links between the switching device and the signaling point of the SG, the utilization rate of the link can be improved, and the Signaling transmission and processing capabilities for next-generation networks. the

Description of drawings

Figure 1 is a schematic diagram of the position of SG in the next generation network;

Figure 2 is a schematic diagram of a network that performs 1+1 backup of switching devices in the next-generation network;

Fig. 3 has shown the networking schematic diagram that realizes SG dual homing in the next generation network according to a preferred embodiment of the present invention;

Fig. 4 has shown the networking schematic diagram that realizes SG dual homing in the next generation network according to another preferred embodiment of the present invention;

FIG. 5 is a flow chart of the method for implementing SG dual-homing based on route priority in the present invention. the

Detailed ways

In order to improve the utilization rate of switching equipment in the next generation network, the invention provides a method for realizing SG dual-homing. The dual-homing means that two switching devices that work normally are set to have a dual-homing and mutual-assistance relationship, and the SG connected to one of the two switching devices is connected to another switching device that has a mutual-assisting relationship with the switching device At the same time, a master switching device and a slave switching device are respectively set for each SG connected to the two switching devices. When the two switching devices work normally, each SG performs signaling interaction with the master switching device to which it belongs. , when a master switching device fails, the SG that performs signaling interaction with the faulty switching device will be switched to another switching device, that is, the slave switching device that switches the SG, and continues to perform signaling interaction. Therefore, adopting the above SG dual-homing method can improve the reliability of the next generation network without reducing the utilization rate of the switching equipment. The core of the method of the present invention is to use the above-mentioned dual-homing mode to realize the dual-homing of the SG, so as to improve the reliability of the next-generation network and the utilization rate of equipment. the

The method for implementing SG dual-homing in the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments of the present invention. the

Example 1:

FIG. 3 shows a schematic diagram of a network for implementing SG dual-homing in a next-generation network according to this embodiment. As shown in Figure 3, SG C and SG D are connected to switching equipment A and switching equipment B respectively at the same time, switching equipment A and switching equipment B have a dual-homing mutual assistance relationship, and switching equipment A is the main switching equipment of SGC, as The slave switching device of SG D, and the switching device B is the slave switching device of SG C, and the master switching device of SG D. For convenience of description, any one of the switching devices may be referred to as a first switching device, and the other switching device may be referred to as a second switching device. Under normal circumstances, signaling point c of SG C performs signaling interaction with source signaling point a of switching device A, while signaling point d of SG D performs signaling interaction with source signaling point b of switching device B. The implementation method of SG dual-homing described in this embodiment mainly includes:

Two logically independent source signaling points a and b are respectively configured on switching equipment A and switching equipment B with a dual-homing mutual aid relationship. These two source signaling points a and b have a mutual assistance relationship. For the convenience of description, One of the signaling points can also be called the first signaling point, and the other signaling point can be called the second signaling point;

Configure two types of connections from signaling point c on SG C to source signaling point a with different priorities: the link from signaling point c with higher priority to source signaling point a on switching device A, that is, the first Connection, as shown by the solid line in the figure, and the link from signaling point c with lower priority to source signaling point a on switching device B, that is, the second connection, as shown by the dotted line in the figure;

Similarly, configuring signaling point d on SG D to source signaling point b includes two connections with different priorities: a link from signaling point d with higher priority to source signaling point b on switching device B, That is, the first connection, as shown by the solid line in the figure, and the link from the signaling point d with lower priority to the source signaling point b on switching device A, that is, the second connection, as shown by the dotted line in the figure. the

After the above configuration, the dual homing of SG C and SG D to switching device A and switching device B can be realized. The transmission process of signaling messages is as follows:

For the uplink signaling message, under normal circumstances, when the uplink signaling message whose destination signaling point is the source signaling point a arrives at the signaling point c of the SGC, the SGC will first judge that the signaling point c is from the source signaling point a. Whether the link with higher priority at signaling point a is available, if the link with higher priority is available, that is, switching device A is working normally, then send the uplink signaling message to switching device A through the high priority link otherwise, that is, when switching device A is out of service for some reason, such as when a fault occurs, SGC sends the uplink signaling message to the switching device through a low-priority link The source signaling point a on B is processed, so as to realize the dual homing from SG C to switching device A and switching device B. the

Since the link is a transmission channel for signaling messages, once the switching device fails, the link cannot send and receive messages normally. Therefore, the physical layer or link layer of the SGC can easily detect whether the link is faulty, and based on This selects the appropriate link for sending the signaling message. the

The implementation method of SG D dual-homing is basically the same as the above method. Specifically, when the uplink signaling message whose destination signaling point is the source signaling point b reaches the signaling point d of SG D, SG D will firstly The priority of the link in the road set is selected, and the link with a higher priority is selected to send the uplink signaling message to the source signaling point b on the switching device B. If the source signaling point b on the switching device B is unreachable, the The low-priority link sends the uplink signaling message to the source signaling point b on the switching device A, so as to realize the dual-homing from the SG D to the switching device B and the switching device A. the

For the downlink signaling message, under normal circumstances, the source signaling point a of the switching device A sends the downlink signaling message to the signaling point c of the SGC, and the source signaling point b of the switching device B sends the downlink signaling message Send the message to the signaling point d of SG D; in the case of a failure of one of the switching devices, the two source signaling points on the switching device that has not failed should send the signaling point c of SG C and SG D respectively The signaling point d of sends the downlink signaling message. For example, when switching device A fails, the source signaling point a on switching device B performs signaling interaction with signaling point c of SGC. the

It can be seen from this that the method described in this embodiment can greatly improve the reliability of the next generation network, and because switching device A and switching device B interact with SG C and SG D respectively in a normal state, therefore, it can improve The utilization of the switching device. the

In order to avoid sending downlink signaling messages to SG C at signaling point a of two switching devices at the same time or sending downlink signaling messages at signaling point b of two devices to signaling point on SG D at the same time, causing the signaling message Repeated "active-active" situation, when SG C and SG D receive signaling messages from switching device A and switching device B at the same time, they will discard messages from lower-priority links according to the link priority, for example , the SGC will discard the signaling message from switching device B. the

In addition, taking SGC as an example, in the method described in this embodiment, when switching device A fails, although SGC detects that the link with higher priority is unavailable, it does not consider that the source signaling point a is unreachable, but sends the signaling message to the source signaling point a of switching device B through a low-priority link. Therefore, it can be seen that the method described in this embodiment can realize SG when the switching device fails. smooth switching. the

According to the protocol, the maximum number of links in a link set configured between two signaling points is limited, generally up to 16 links. In the method described in this embodiment, the SG needs to configure redundant links. For example, the link from signaling point c on SG C to source signaling point a of switching device B is equivalent to the backup link of the link from signaling point c on SG C to source signaling point a of switching device A, In this way, under normal circumstances, these redundant links are not used to transmit signaling messages, resulting in low link utilization between signaling points, and, between signaling point c of SGC and source signaling point When the business volume of a is large, the number of links may not be enough. the

In order to solve this problem, the present invention further provides a method for implementing SG dual-homing based on routing priority, see Embodiment 2. the

Example 2:

FIG. 4 shows a schematic diagram of a network for implementing SG dual-homing in a next-generation network according to this embodiment. As shown in Figure 4, SG C and SG D are connected to switching device A and switching device B respectively, wherein switching device A and switching device B have a dual-homing mutual assistance relationship, and switching device A is the main switching device of SG C , is the slave switching device of SG D, and switching device B is the slave switching device of SG C, and is the master switching device of SG D. For convenience of description, any one of the switching devices may be referred to as a first switching device, and the other switching device may be referred to as a second switching device. Under normal circumstances, signaling point c of SGC performs signaling interaction with source signaling point a of switching device A, while signaling point d of SGD performs signaling interaction with source signaling point b of switching device B. The implementation method of SG dual-homing described in this embodiment includes:

Two logically independent source signaling points a and b are respectively configured on switching equipment A and switching equipment B that have a mutual aid relationship, and these two source signaling points a and b are configured to have a mutual assistance relationship. For the convenience of description, One of the signaling points can also be called the first signaling point, and the other signaling point can be called the second signaling point;

Configure two connections with different priorities from signaling point c on SG C to source signaling point a: a direct route from signaling point c with higher priority to source signaling point a on switching device A, that is, the first connection, As shown by the solid line in the figure, and the detour route from signaling point c with lower priority to source signaling point b on switching device B and then to source signaling point a, that is, the second connection, as shown by the dotted line in the figure , here, the source signaling point b is regarded as a signaling transfer point (STP);

Similarly, configure two connections with different priorities from signaling point d to source signaling point b on SG D: a direct route from signaling point d with higher priority to source signaling point b on switching device B, namely The first connection, as shown by the solid line in the figure, and the detour route from the signaling point d with lower priority to the source signaling point a on the switching device A and then to the source signaling point b, that is, the second connection, as shown in the figure As shown by the dashed line, here, the source signaling point a is also regarded as the STP. the

After the above configuration, the dual homing of SG C and SG D can also be realized. For the uplink signaling message, the transmission process of the signaling message is shown in Figure 5. the

Steps 501-503: When the uplink signaling message whose destination signaling point is source signaling point a arrives at signaling point c of SGC, SGC will first judge the two routes from signaling point c to source signaling point a Whether the direct route with higher priority is available,

If the high-priority route in the link set is available, that is, switching device A is working normally, then perform step 502, using the high-priority direct route to directly send the uplink signaling message to the source signaling point on switching device A a process, then end;

Otherwise, that is, when switching device A is out of service for some reason, for example, when a fault occurs, step 503 is performed, and the uplink signaling message is passed through the link between SGC and switching device B using a detour route with a low priority. The road is sent to the source signaling point b on the switching device B, and then step 504 is performed;

Steps 504-506: Switching device B judges whether source signaling point a is the source signaling point of the switching device according to the pre-configured source signaling point, and if so, executes step 505, and source signaling point b transfers the signal Make message forward to source signaling point a, be terminated by source signaling point a and process described signaling message, at this moment, the effect of source signaling point is an STP, then end; Otherwise, execute step 506, discard described signaling message, and then end. the

For the downlink signaling message, when switching device A exits the service, if the source signaling point a of switching device B needs to transfer the signaling message to other switching devices through SGC, because the source signaling on switching device B There is no link between point a and signaling point c of SG C, switching device B needs to first determine the relationship between the mutual assistance source signaling point b of source signaling point a on switching device B and signaling point c on SG C Whether the link is available, if available, the signaling message is sent to the SGC through the link between the source signaling point b and the signaling point c on the SGC, and then forwarded by the SGC, at this time, The role of the source signaling point b is still an STP; if the link between the source signaling point b and the signaling point c on the SGC is unavailable, the downlink signaling message cannot be sent. the

Since all links in a link set between two signaling points fail, routing failure will result. Therefore, when switching device A fails, SG C will immediately detect that signaling point c on SG C reaches the source signal. Make the direct route failure of point a unavailable. the

The implementation method of SGD dual-homing is basically the same as the above method, and will not be repeated here. the

Also in order to avoid the signaling point a of two switching devices from sending downlink signaling messages to SG C at the same time or the signaling point b of two devices from sending downlink signaling messages to the signaling point on SG D at the same time, causing the signaling message In the repeated "active-active" situation, when SG receives signaling messages from switching device A and switching device B at the same time, it will discard messages from routes with lower priority according to the route priority. For example, for SG C Signaling messages from switching device B will be discarded. the

In addition, taking SGC as an example, in the method described in this embodiment, when switching device A fails, although SGC detects that the direct route with higher priority is unavailable, it does not consider that the source signaling point a is not reachable, but the signaling message is sent to the switching device B using a low-priority route. Therefore, it can be seen that the method described in this embodiment can realize smooth switching of the SG when the switching device fails. the

It can be seen that the method described in this embodiment has the same advantages as in Embodiment 1, that is, on the one hand, it can improve the reliability of the next-generation network while improving the utilization rate of switching equipment; on the other hand, it can also realize Smooth switching of SG. In addition, due to the method described in this embodiment, there is no need to set redundant links between the switching device and the signaling point of the SG, so the utilization rate of the link is improved, and the next generation network is effectively guaranteed. Signaling processing performance when the traffic is large. the

The following takes SGC as an example to describe this advantage in detail. As can be seen from the above methods, the method described in this embodiment configures two routes between the signaling point c of the SGC and the source signaling point a: a direct route and a detour route, wherein the detour route essentially only occupies The link between signaling point c on SG C and source signaling point b on switching device B is occupied, but the link between signaling point c and switching device A or source signaling point a on switching device B is not occupied , therefore, under normal circumstances, the link between signaling point c on SGC and signaling point a on switching device A can be configured at full capacity, which can greatly meet the demand of traffic. In addition, since signaling interaction between signaling point c on SG C and signaling point b on switching device B is usually not performed, signaling point d on SG D and signaling point b on switching device B are usually used Signaling interaction, therefore, when switching device A fails and SGC uses a detour route to transmit signaling messages, the link occupied by the transmission of signaling messages will not affect other services. The link between point c and signaling point b on switching device B can also be configured at full load, so that its own traffic will not be affected. the

Claims (5)

1. a method that realizes signalling gateway dual-homing in next generation network is characterized in that,

Be provided with between first, second switching equipment and have mutual-aid relation, and on described first, second switching equipment, first Original Signaling Point is set respectively; On described first, second switching equipment, second Original Signaling Point is set respectively; Be provided with between first Original Signaling Point on each switching equipment and second Original Signaling Point and have mutual-aid relation;

Will carry out all mutual SGWs with described first Original Signaling Point and be connected respectively to first Original Signaling Point on first, second switching equipment, and corresponding each SGW, be provided with on this SGW and first switching equipment between first Original Signaling Point first priority that is connected be higher than with second switching equipment on second priority that is connected between first Original Signaling Point;

Will carry out all mutual SGWs with described second Original Signaling Point and be connected respectively to second Original Signaling Point on first, second switching equipment, and corresponding each SGW, be provided with first priority that is connected between second Original Signaling Point on this SGW and second switching equipment be higher than with first switching equipment on second priority that is connected between second Original Signaling Point;

After each SGW receives the signaling message that destination signaling point is described first Original Signaling Point, judge with first switching equipment on priority between first Original Signaling Point higher first be connected whether available, if available, then by first between first Original Signaling Point on described and first switching equipment be connected with first switching equipment on first Original Signaling Point carry out Signalling exchange; Otherwise, by second between first Original Signaling Point on described and second switching equipment be connected with second switching equipment on first Original Signaling Point carry out Signalling exchange;

After each SGW receives the signaling message that destination signaling point is described second Original Signaling Point, judge with second switching equipment between second Original Signaling Point priority higher first be connected whether available, if available, then by first between second Original Signaling Point on described and second switching equipment be connected with second switching equipment on second Original Signaling Point carry out Signalling exchange; Otherwise, by second between second Original Signaling Point on described and first switching equipment be connected with first switching equipment on second Original Signaling Point carry out Signalling exchange.

2. the method for claim 1 is characterized in that, first on described and first switching equipment between first Original Signaling Point is connected on the described SGW link between first Original Signaling Point on the signalling point and described first switching equipment;

On described and second switching equipment between first Original Signaling Point second is connected on the described SGW link between first Original Signaling Point on the signalling point and described second switching equipment.

3. the method for claim 1 is characterized in that, described method further comprises:

On described and first switching equipment between first Original Signaling Point first is connected on the described SGW direct route between first Original Signaling Point on the signalling point and described first switching equipment;

On described and second switching equipment between first Original Signaling Point second is connected on the described SGW on the signalling point and described second switching equipment between first Original Signaling Point, through the alternate route of second Original Signaling Point switching on described second switching equipment.

4. method as claimed in claim 3 is characterized in that, described by be connected with second between first Original Signaling Point on second switching equipment with described second switching equipment on first Original Signaling Point carry out Signalling exchange and comprise:

Described SGW sends to second Original Signaling Point on described second switching equipment by the lower alternate route of priority with up signaling message; Described second Original Signaling Point is forwarded to first Original Signaling Point on described second switching equipment with described up signaling message;

First Original Signaling Point sends to described second switching equipment, second Original Signaling Point with downlink signaling message on described second switching equipment, and described second Original Signaling Point is transmitted described downlink signaling message to described SGW.

5. the method for claim 1, it is characterized in that, described method further comprises: after described SGW receives signaling message from first Original Signaling Point of described first, second switching equipment simultaneously, according to the priority that connects, selective reception from priority higher with first switching equipment on first signaling message that is connected between first Original Signaling Point, abandon from priority lower with second switching equipment on second signaling message that is connected between first Original Signaling Point.

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