CN101217405B - SGSN backup method and communication system, communication device - Google Patents
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Abstract
The embodiment of the invention discloses an SGSN backup method, comprising that the supporting point SGSN of a standby service GPRS is linked with a packet control unit PCU, and the configuration data of a primary SCSN is synchronized through a channel arranged between the primary SCSN; when a standby SGSN tests that the primary SGSN is in failure, a business processing is done to the business data transmitted by the PCU, according to synchronous configuration data; correspondingly, the embodiment of the invention provides a communication system and communication equipment, and the technical proposal provided by the embodiment of the invention can improve the reliability of the communication network with little alteration towards the present networks.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a SGSN backup method, a communications system, and a communications device.
Background
The GPRS (General Packet Radio Service) Service is a wireless Packet data Service provided based on the GSM (Global System for Mobile Communications) Service, and is currently widely used globally. Currently, the networking mode of GPRS devices running on the current network only supports one BSC (Base Station controller) device to access a unique serving GPRS support node SGSN, and the SGSN provides services for the BSC. Once the SGSN serving the BSC fails, the service of all terminal MS users connected to the BSC is interrupted, which may cause a large number of users to fail to use the network normally, and seriously affect the reliability of the communication network.
To solve this problem, The Gb-Flex protocol is defined by The 3GPP (The 3rd Generation Partnership Project, third Generation Partnership Project) organization. The networking scheme in the protocol requires that one BSC is connected with a plurality of SGSNs in the same POOL POOL area, and a backup function is realized among the SGSNs. Thus, even if one SGSN fails, the BSC can also access through other SGSNs in the same POOL area. Because the probability of simultaneous failure of multiple SGSNs is very low, the user service can continue as long as there is a SGSN in a normal operating state. This greatly improves the reliability of the communication network.
During the research and practice of the prior art, the inventor finds that the prior art has the following problems:
the networking scheme in the Gb-Flex protocol proposed by the 3GPP organization requires that all existing network BSCs support the new Gb-Flex standard to implement, but almost all BSCs operated by the existing networks cannot support the technology at present, so to implement the networking scheme in the Gb-Flex protocol, network upgrade must be performed, including upgrade of all BSCs. Since the PCU is a functional entity disposed in the BSC, that is, all PCUs need to be upgraded, which results in huge working cost and workload, it is not feasible to adopt the networking scheme in the Gb-Flex protocol to improve the reliability of the communication network.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide a method for backing up SGSNs, a communication system, and a communication device, which can implement the backup between SGSNs and improve the reliability of a communication network under the condition that the functions of the access network devices of the existing network are not changed, that is, under the condition that the functions of the internal functional entity PCU of the BSC are not changed.
In order to solve the technical problem, the embodiment provided by the invention is realized by the following technical scheme:
the embodiment of the invention provides a backup method of SGSN, comprising the following steps: a standby service GPRS support node SGSN establishes a link with a packet control unit PCU, synchronizes configuration data of a main SGSN through a heartbeat channel arranged between the standby service GPRS support node SGSN and the main SGSN, and forwards service data, utilization rate information of an interactive link and a message of a congestion state through a forwarding channel arranged between the standby service GPRS support node SGSN and the main SGSN; and when the standby SGSN detects that the main SGSN has a fault, carrying out service processing on service data transmitted by the PCU according to the synchronous configuration data.
The embodiment of the invention provides a communication system, which comprises a main SGSN and a standby SGSN; the main SGSN is used for establishing a link with the PCU and synchronously configuring data through a heartbeat channel arranged between the main SGSN and the standby SGSN; the standby SGSN comprises a plurality of processing modules, and each processing module comprises a linking unit, a first setting processing unit, a fault processing unit and a second setting processing unit; the link unit is used for establishing a link with the PCU; the first setting processing unit is configured to set a heartbeat channel between the standby SGSN and the main SGSN, synchronize configuration data of the main SGSN through the heartbeat channel, and detect an operating state of the corresponding main SGSN through the heartbeat channel; the failure processing unit is configured to perform service processing on service data transmitted by the PCU according to the synchronized configuration data when the first setting processing unit detects that the corresponding primary SGSN has a failure; the second setting and processing unit is configured to set a forwarding channel between the standby SGSN and the active SGSN, where the standby SGSN and the active SGSN forward service data, utilization rate information of an interactive link, and a congestion status message through the forwarding channel.
An embodiment of the present invention provides a communication device, including a plurality of processing modules, where the processing modules include: a link unit for establishing a link with the PCU; a first setting and processing unit, configured to set a heartbeat channel between the communication device and a primary SGSN, synchronize configuration data of the primary SGSN through the heartbeat channel, and detect an operating state of the corresponding primary SGSN through the heartbeat channel; a second setting and processing unit, configured to set a forwarding channel between the communication device and the primary SGSN, where the communication device and the primary SGSN forward service data, utilization information of an interactive link, and a congestion status message through the forwarding channel; and the fault processing unit is used for carrying out service processing on the service data transmitted by the PCU according to the synchronous configuration data when the first setting processing unit detects that the corresponding main SGSN has faults.
It can be seen from the above technical solutions that, in the embodiments of the present invention, by using the interactive linkage between the standby SGSN and the active SGSN, the backup between the SGSNs is realized under the condition that the function of the access network device of the existing network is not changed, that is, under the condition that the function of the internal functional entity PCU of the BSC is not changed, so that the reliability of the communication network is improved.
Drawings
Fig. 1 is a flowchart of a backup method of an SGSN according to an embodiment of the present invention;
FIG. 2 is a networking schematic diagram of an embodiment of the present invention for N +1 backup;
fig. 3 is a schematic diagram of an operation process between a standby SGSN and an active SGSN according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a communication system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a backup method of SGSN, which can improve the reliability of a communication network under the condition of slightly changing the existing network.
The embodiment of the invention provides an 'N + 1' backup scheme. The concept of "N + 1" of a communication device generally refers to N active devices, and 1 standby device is commonly used, and when a certain active device fails, the standby device can take over services immediately. Of course, N may also be 1. The backup disaster recovery scheme of the embodiment of the invention has no new functional requirements on BSC equipment and a transmission network used by the current network. In the scheme of the embodiment of the invention, 1 standby SGSN provides a backup function for the services of N main SGSNs, the standby SGSN can automatically detect the fault of the main SGSN, and when the fault of the main SGSN is detected, the service of the main SGSN can be taken over immediately, thereby greatly shortening the service interruption time and improving the service reliability.
The following describes a backup method of an SGSN according to an embodiment of the present invention in detail with reference to the accompanying drawings.
Please refer to fig. 1, which is a flowchart illustrating a backup method for an SGSN according to an embodiment of the present invention, including:
step 101, a PCU (Packet Control Unit) establishes links with a main SGSN and a standby SGSN, respectively;
the PCU is a functional entity arranged in the BSC, and establishes links with the active SGSN and the standby SGSN respectively.
Step 102, the standby SGSN synchronously configures data through a channel arranged between the standby SGSN and the main SGSN;
a channel is arranged between the standby SGSN and the main SGSN, and the synchronization of the configuration data is carried out through the arranged channel, so that the data does not need to be reloaded when the main SGSN and the standby SGSN are switched.
Step 103, when the standby SGSN detects that the active SGSN has a failure, performing service processing on service data transmitted by the PCU according to the synchronized configuration data.
When the standby SGSN detects that the main SGSN has a fault through the set channel, because the synchronization of the configuration data is performed before, the state of the standby SGSN is switched to the main state, and the standby SGSN starts to take over the load-bearing service of the main SGSN according to the configuration data synchronized with the main SGSN before, and performs service processing on the service data transmitted by the PCU.
Please refer to fig. 2, which is a schematic diagram of a networking scheme of N +1 backup according to an embodiment of the present invention.
As shown in fig. 2, includes: PCU1, PCU2.. PCUn; primary SGSN1, sgsn2.. SGSNn, standby SGSN. Each PCU is connected with a main SGSN and a standby SGSN, and the standby SGSN is connected with each main SGSN through a heartbeat channel and a forwarding channel.
Further please refer to fig. 3, which is a schematic diagram illustrating a working process between the standby SGSN and the active SGSN according to the embodiment of the present invention. Fig. 3 is an example of a 2+1 backup but is not limited thereto.
Fig. 3 includes: PCU1, PCU 2; a primary SGSN1, a SGSN2, and a standby SGSN. The standby SGSN comprises a plurality of Virtual SGSN processing modules, the number of the Virtual SGSN processing modules can be determined according to the number of the main SGSN (including Virtual SGSN1 and Virtual SGSN2), each Virtual SGSN processing module monitors the real-time running state of one corresponding main SGSN, copies the configuration data of the corresponding main SGSN and synchronizes with the main SGSN, so that the data does not need to be reloaded when the main SGSN and the standby SGSN are switched, and the service of the main SGSN can be directly taken over according to the synchronized configuration data. The standby SGSN can also comprise a hard cut standby SGSN module which is used as the hard cut backup of other main SGSNs when the hard cut is carried out manually.
An IP-based heartbeat channel and a forwarding channel are established between the main SGSN and the standby SGSN. For reliability, a plurality of heartbeat channels and forwarding channels can be configured and established on a plurality of physical interfaces, so as to prevent an internal automatic judgment from being wrong due to the abnormality of one channel or one interface.
Each PCU has a TDM (Time Division Multiplexing) link divided into two parts (which may be considered as two for simplicity of description herein) and connected to the active SGSN and the standby SGSN, respectively. Represented in fig. 2 as: one link of the PCU1 is connected to the active SGSN1, and the other link is connected to the Virtual SGSN1 in the standby SGSN; one link of the PCU2 is connected to the active SGSN2, and the other link is connected to the Virtual SGSN2 in the standby SGSN. This is met under existing networking conditions, since existing PCUs typically have multiple links connected as redundant backups to one SGSN.
After briefly introducing the schematic structure of fig. 3, the following describes in detail a processing method of SGSN N +1 backup.
The main SGSN and the standby SGSN synchronize the running states of each other in real time through a set heartbeat channel. The fault can be judged by monitoring the heartbeat message sent by the SGSN at the opposite end between the main SGSN and the standby SGSN so as to trigger corresponding actions. The manual switching provided by the main SGSN and the standby SGSN and the function operation of manual locking and the like are also synchronized to the opposite SGSN through the heartbeat channel, and the corresponding action of the opposite SGSN is triggered.
The active SGSN and the standby SGSN synchronize configuration information such as forwarding channel states, NSVC (Network Service Virtual Connection), NSE (Network Service Entity), and the like with each other through a heartbeat channel. The SGSN N +1 backup function works normally, and the configuration data between the primary SGSN and the backup SGSN needs to be matched. Because the configuration of data is complicated and the possibility of errors is high, the SGSN of the embodiment of the invention provides a synchronization function (namely a data configuration checking function), checks the relevant configuration data of the SGSN N +1 backup function, synchronizes the configuration data of the standby SGSN into the configuration data on the main SGSN, avoids the service damage caused by data configuration errors, and can report and alarm the wrong configuration data. The synchronous data is mainly configuration data on a Gb interface of the SGSN and configuration data of a forwarding channel related to the backup function, and the configuration data corresponding to the active SGSN and the standby SGSN should be consistent. Synchronization, as used herein, includes periodic synchronization, and synchronization that initiates a delay check timer trigger after modification of the configuration data. The specific synchronization process is that the main SGSN and the standby SGSN mutually send messages containing configuration data structures through a heartbeat channel, one end receiving the messages is compared with the configuration data of the local end after analyzing the received messages, if the received messages are inconsistent, the synchronization is consistent configuration data, and meanwhile, an event alarm can be generated.
In the technical scheme of the embodiment of the invention, a forwarding channel is also arranged between the main SGSN and the standby SGSN. In the case of normal operation of the network, uplink messages (e.g., signaling, data, etc.) from the PCU may be sent uplink via the link connected to the active SGSN or uplink via the link connected to the standby SGSN. However, at this time, the service is performed only on the active SGSN, which requires the use of the forwarding path function to the set SGSN. When the uplink message of the PCU is sent to the standby SGSN, the standby SGSN forwards the uplink message to the main SGSN for processing through a forwarding channel, namely the standby SGSN only processes and forwards the uplink message and does not process the uplink message. Similarly, after the service is processed on the active SGSN, the downlink message is sent to the PCU through the link of the active SGSN or through the link of the standby SGSN. If the downlink message is sent by selecting the link of the standby SGSN, the downlink message is forwarded to the standby SGSN by the main SGSN through a forwarding channel and is sent to the PCU through the link of the standby SGSN. The forwarding channel also carries utilization rate information of the link and information of the congestion state. The primary SGSN and the standby SGSN judge the whole link utilization state through the interaction of the messages, and the load sharing function of the bottom link is completed. If the forwarding channel state fails, the active SGSN and the standby SGSN can sense through the messages.
According to the networking mode of the embodiment of the invention, under the abnormal condition, the main SGSN and the standby SGSN correspondingly process different faults:
when the standby SGSN detects that the main SGSN has a fault through the heartbeat channel, the standby SGSN takes over the service, and the service is carried out through the standby SGSN. This case is the triggering of automatic switching. The method specifically comprises the following steps: the standby SGSN detects the running state of the main SGSN through a heartbeat channel, when the service processing capacity of the main SGSN is interrupted, namely a fault occurs, the state of the standby SGSN is switched to the main state, the standby SGSN starts to take over the service carried by the main SGSN according to the configuration data which is synchronized with the main SGSN before, and the uplink data sent by the PCU or the downlink data sent to the PCU are not forwarded any more but are processed by the standby SGSN. Thus, the standby SGSN takes over the service of the main SGSN quickly, thereby reducing the service interruption time to the minimum and improving the reliability of the communication network.
In addition, because the embodiment of the invention also sets the forwarding channel besides the heartbeat channel, when the heartbeat channel between the main SGSN and the standby SGSN breaks down and the forwarding channel is normal, the service is normally carried out and is not influenced. In this case, although the heartbeat channel fails, the switching is not triggered because the forwarding channel is normal and the service function of the SGSN can still be performed normally through the forwarding channel.
When the forwarding channel between the main SGSN and the standby SGSN breaks down and the heartbeat channel is normal, the service is normally carried out without being influenced. When this situation detects that the forwarding channel fails, the service message cannot be forwarded between the two SGSNs through the forwarding channel, but as long as the link of the active SGSN is still normal, the service can still be performed normally.
When the standby SGSN breaks down, the service is normally carried out through the main SGSN. If the active SGSN does not receive the message of the standby SGSN through the heartbeat channel for a period of time, it is considered that the standby SGSN has failed, which is equivalent to the case where there is no standby SGSN function. The main SGSN processes the service normally through its own link.
When one of the link of the PCU connected to the active SGSN and the link connected to the standby SGSN is in failure, the service is performed from the other link. For example, when the link connecting the PCU to the active SGSN is interrupted, the uplink and downlink messages are relayed by the standby SGSN, and if the active SGSN detects the interruption of its own link and has a downlink message, the uplink and downlink messages are forwarded through the forwarding channel and sent downlink through the physical link of the standby SGSN, thereby ensuring that the service is not interrupted.
The foregoing describes a backup method for SGSN in detail according to an embodiment of the present invention, and accordingly, an embodiment of the present invention provides a communication system and a communication device.
Please refer to fig. 4, which is a schematic diagram of a communication system according to an embodiment of the present invention.
A communication system includes: primary SGSN 41, primary SGSN 42, and standby SGSN 43. It should be noted that, here, only two primary SGSNs are taken as an example for description, but the present invention is not limited to this.
The active SGSN is configured to establish a link with the PCU and synchronize configuration data through a path set between the active SGSN and the standby SGSN 43.
And the standby SGSN 43 is configured to establish a link with the PCU, synchronize configuration data of the active SGSN through a channel provided between the standby SGSN and the active SGSN, and perform service processing on service data transmitted by the PCU according to the synchronized configuration data when detecting that the active SGSN has a failure.
The standby SGSN 43 includes a plurality of processing modules, which are illustrated in fig. 4 by two processing modules 431 and 432, but are not limited thereto. Each processing module includes: a link unit 4311, a first setting processing unit 4312, and a failure processing unit 4313.
A link unit 4311 for establishing a link with the PCU.
A first setting and processing unit 4312, configured to set a heartbeat channel between the standby SGSN 43 and the active SGSN, synchronize configuration data of the active SGSN through the heartbeat channel, and detect an operating state of the corresponding active SGSN through the heartbeat channel.
A failure processing unit 4313, configured to, when the first setting processing unit 4312 detects that the corresponding active SGSN has a failure, perform service processing on service data transmitted by the PCU according to the synchronized configuration data.
The processing module further comprises: the second setting processing unit 4314.
A second setting and processing unit 4314, configured to set a forwarding channel between the standby SGSN 43 and the active SGSN, where the standby SGSN 43 and the active SGSN forward service data through the forwarding channel.
Please refer to fig. 5, which is a schematic structural diagram of a communication device according to an embodiment of the present invention.
The communication device comprises a plurality of processing modules, illustrated in fig. 5 by two processing modules 431 and 432, but not limited thereto. Each processing module includes: a link unit 4311, a first setting processing unit 4312, and a failure processing unit 4313. The communication device described herein acts as a backup SGSN.
A link unit 4311 for establishing a link with the PCU.
A first setting and processing unit 4312, configured to set a heartbeat channel between the communication device and the primary SGSN, synchronize configuration data of the primary SGSN through the heartbeat channel, and detect an operating state of the corresponding primary SGSN through the heartbeat channel.
A failure processing unit 4313, configured to, when the first setting processing unit 4312 detects that the corresponding active SGSN has a failure, perform service processing on service data transmitted by the PCU according to the synchronized configuration data.
The processing module further comprises: the second setting processing unit 4314.
A second setting and processing unit 4314, configured to set a forwarding channel between the communication device and the active SGSN, where the communication device and the active SGSN forward service data through the forwarding channel.
In summary, the embodiment of the present invention utilizes the interactive linkage between the standby SGSN and the active SGSN to implement the backup between SGSNs under the condition that the function of the access network device of the current network is not changed, that is, under the condition that the function of the internal functional entity PCU of the BSC is not changed, so that the reliability of the communication network is improved.
Furthermore, in the embodiment of the present invention, besides the heartbeat channel is set between the standby SGSN and the active SGSN, a forwarding channel is also set, so that service data between the PCU and the active SGSN can be forwarded through the standby SGSN, a transmission path is increased, and the reliability of the communication network is further improved.
In the above, the backup method for SGSN, the communication system and the communication device provided in the embodiments of the present invention are described in detail, and a person skilled in the art may change the specific implementation and application scope according to the idea of the embodiments of the present invention.
Claims (6)
1. A backup method for SGSN is characterized in that the method comprises the following steps:
a standby service GPRS support node SGSN establishes a link with a packet control unit PCU, synchronizes configuration data of a main SGSN through a heartbeat channel arranged between the standby service GPRS support node SGSN and the main SGSN, and forwards service data, utilization rate information of an interactive link and a message of a congestion state through a forwarding channel arranged between the standby service GPRS support node SGSN and the main SGSN;
and when the standby SGSN detects that the main SGSN has a fault, carrying out service processing on service data transmitted by the PCU according to the synchronous configuration data.
2. The backup method for SGSN according to claim 1, wherein:
and a processing module contained in the standby SGSN detects the running state of each corresponding main SGSN.
3. The backup method for SGSN according to claim 1, wherein:
the forwarding of the service data by the standby SGSN and the active SGSN through the forwarding channel specifically includes:
the standby SGSN receives the uplink service data sent by the PCU and forwards the uplink service data to the main SGSN through the forwarding channel; or,
and the standby SGSN receives the downlink service data sent by the main SGSN through the forwarding channel and sends the downlink service data to the PCU.
4. The backup method for SGSN according to claim 1, wherein:
the data synchronously configured by the standby SGSN through the channel set between the standby SGSN and the main SGSN specifically includes: and synchronizing the configuration data according to the set time.
5. A communication system is characterized by comprising a main SGSN and a standby SGSN;
the main SGSN is used for establishing a link with the PCU and synchronously configuring data through a heartbeat channel arranged between the main SGSN and the standby SGSN;
the standby SGSN comprises a plurality of processing modules, and each processing module comprises a linking unit, a first setting processing unit, a fault processing unit and a second setting processing unit;
the link unit is used for establishing a link with the PCU;
the first setting processing unit is configured to set a heartbeat channel between the standby SGSN and the main SGSN, synchronize configuration data of the main SGSN through the heartbeat channel, and detect an operating state of the corresponding main SGSN through the heartbeat channel;
the failure processing unit is configured to perform service processing on service data transmitted by the PCU according to the synchronized configuration data when the first setting processing unit detects that the corresponding primary SGSN has a failure;
the second setting and processing unit is configured to set a forwarding channel between the standby SGSN and the active SGSN, where the standby SGSN and the active SGSN forward service data, utilization rate information of an interactive link, and a congestion status message through the forwarding channel.
6. A communication device comprising a plurality of processing modules, the processing modules comprising:
a link unit for establishing a link with the PCU;
a first setting and processing unit, configured to set a heartbeat channel between the communication device and a primary SGSN, synchronize configuration data of the primary SGSN through the heartbeat channel, and detect an operating state of the corresponding primary SGSN through the heartbeat channel;
a second setting and processing unit, configured to set a forwarding channel between the communication device and the primary SGSN, where the communication device and the primary SGSN forward service data, utilization information of an interactive link, and a congestion status message through the forwarding channel;
and the fault processing unit is used for carrying out service processing on the service data transmitted by the PCU according to the synchronous configuration data when the first setting processing unit detects that the corresponding main SGSN has faults.
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| EP2487867B1 (en) * | 2011-02-09 | 2014-01-01 | Siemens Aktiengesellschaft | Keep alive message monitoring |
| CN104702684B (en) * | 2015-03-10 | 2019-01-08 | 新华三技术有限公司 | A kind of method of data synchronization and device |
| CN111405216B (en) * | 2019-10-25 | 2022-06-28 | 杭州海康威视系统技术有限公司 | Configuration method, device and equipment and storage medium |
| CN112732483A (en) * | 2020-12-31 | 2021-04-30 | 联想(北京)有限公司 | Data recovery method, device and system |
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