CN101459541A - Method, equipment and system for detecting link break - Google Patents
Method, equipment and system for detecting link break Download PDFInfo
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- CN101459541A CN101459541A CNA2008102207307A CN200810220730A CN101459541A CN 101459541 A CN101459541 A CN 101459541A CN A2008102207307 A CNA2008102207307 A CN A2008102207307A CN 200810220730 A CN200810220730 A CN 200810220730A CN 101459541 A CN101459541 A CN 101459541A
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Abstract
The embodiment of the invention discloses a method, a device and a system for detecting link interruption, wherein the method comprises the following steps: detecting the connecting state of a stream control transmission protocol SCTP link between a first communication device and a second communication device by the first communication device, generating SCTP link interruption message to transmit to the second communication device on the opposite end when SCTP link connection is detected to be unusually interrupted, notifying the second communication device to dismount the SCTP link which is interrupted, and transferring business data on the SCTP link which is interrupted to a standby SCTP link which is normally connected. The embodiment of the invention which is adopted can rapidly detect out a SCTP link which is not interrupted to be connected, timely notifies a far-end communication device to dismount the SCTP link which is disconnected, transfers business data on the disconnected SCTP link to other normally-connected SCTP links, and reduces the detection to business loss during linkage interrupt of the SCTP.
Description
Technical field
The present invention relates to the communication network transmission technique field, relate in particular to a kind of in IP network method, equipment and the system of fast detecting link down.
Background technology
Stream Control Transmission Protocol SCTP is the transport layer protocol that IETF formulates, the original intention of agreement is to be exclusively used in the signaling transmission, developed into afterwards a kind of can more widely used general transmission agreement, use and also will have more widely as a kind of effective means at the bearer network transmitting signaling.SCTP herein connects the SCTP association that refers to Stream Control Transmission Protocol (IETF RFC4960).
Stream Control Transmission Protocol is applied to the IP network environment, so also inevitable feature that externally embodies IP network of a lot of mechanism, such as connect as SCTP because of IP network unusual etc. former thereby when interrupting, need detect by more passive means such as message re-transmission and heartbeat mechanisms, need long time just can detect the interruption of connection, before SCTP connect to interrupt being detected, SCTP user gave the service message that Stream Control Transmission Protocol sends and substantially can be lost.
Connect the detection of interrupting for SCTP, the standard mode of Stream Control Transmission Protocol is to retransmit the mode of surveying by message.The Stream Control Transmission Protocol message that the local terminal communication equipment sends is under the situation that can not get the apparatus for remote communication confirmation, agreement can be carried out the repeating transmission of message when retransmission timer is overtime, retransmit the process that detects the SCTP connection by message and be subjected to Association.Max.Retrans (the maximum number of retransmissions continuously of the message that SCTP connects, the agreement default value is 10 times), (SCTP connects eartbeat interval to HB.interval, the agreement default value is 30 seconds), RTO.Initial (retransmission time out initial value, the agreement default value is 3 seconds), RTO.Min (retransmission time out minimum value, the agreement default value is 1 second) and RTO.Max (retransmission time out maximum, the agreement default value is 60 seconds) etc. Stream Control Transmission Protocol parameter and the influence of complicated computational methods, because of transmission network abnormal conditions such as (such as IP network), SCTP relies on the method for number of retransmissions value of reaching capacity (Association.Max.Retrans) and judges that SCTP connects interruption and needs long time, needs the time of several seconds even tens seconds at least.
The SCTP retransmission mechanism is summarized as follows:
When sending message, Stream Control Transmission Protocol can start retransmission timer T3-rtx at message that sends or destination address, this timer can be set to RTO (Retransmission Timeout when starting first, the retransmission time out timer), and RTO is the dynamic change with measurement always, but minimum value can not be lower than RTO.Min;
Exceed the time limit not confirm if message has taken place the overtime explanation of T3-rtx, need carry out message this moment and retransmit, all use current RTO to double duration exceeding the time limit the time at every turn when retransmitting as T3-rtx;
Confirm if message number of retransmissions value of reaching capacity (Association.Max.Retrans) still can not get apparatus for remote communication, judge that then the SCTP link connects interruption;
Connect when idle at SCTP, when promptly not having business datum to transmit, use the SCTP heartbeat mechanism to detect the transmission path state of SCTP, heartbeat sends according to the interval of HB.interval at least; Whether the connection of SCTP link is interrupted also detecting by heartbeat mechanism in theory, but needs the longer time.
In sum, the message that passes through that relies on Stream Control Transmission Protocol is at present retransmitted the overlong time that the connection of detection mode detection SCTP link is interrupted, apparatus for remote communication perception in time SCTP link connects interruption, the business datum that the SCTP link that has interrupted is born forwards on other normal SCTP link that connects, and can cause a large amount of service message loss of SCTP user like this.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus and system that detects link down, can fast detecting go out the SCTP link that interruption connects, and the SCTP link of in time notifying apparatus for remote communication to dismantle to have interrupted, business datum on the SCTP link that has interrupted is forwarded on other normal SCTP link that connects, reduced the traffic lost that detects in the SCTP connection intercourse.
The embodiment of the invention provides a kind of method that detects link down, comprises step:
SCTP SCTP link connection status between detection of first communication equipment and the second communication equipment;
When having detected SCTP link connection aborted, then generate SCTP and connect the described second communication equipment that interrupt message sends the opposite end to, the SCTP link of notifying described second communication equipment to dismantle and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection.
Further, the embodiment of the invention also provides a kind of communication equipment that detects link down, comprising:
At least one SCTP SCTP link monitoring module, be used to detect the SCTP link connection status between self communication equipment and the opposite end second communication equipment that links to each other, when having detected the SCTP link in self communication equipment one side and connect aborted, then generate SCTP and connect interrupt message;
Notification module, be used for that described SCTP is connected interrupt message and send to described opposite end second communication equipment, notify the described opposite end SCTP link that second communication equipment is dismantled and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection.
Further, the embodiment of the invention also provides a kind of system that detects link down, comprising:
First communication equipment, be used for by at least one SCTP SCTP link monitoring module detection of setting and the SCTP link connection status between the second communication equipment, connect aborted if detected the SCTP link, then generate SCTP connection interrupt message and send opposite end second communication equipment to by notification module;
Second communication equipment, be used for setting up many SCTP and be connected link with described first communication equipment, and when receiving described SCTP when connecting interrupt message, the SCTP link of dismantling and having interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection.
Adopt embodiments of the invention, when connecting aborted by detected the SCTP link in local terminal communication equipment one side, then generate SCTP immediately and connect the SCTP link that interrupt message notice apparatus for remote communication is dismantled and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on SCTP link of other normal connection, the SCTP link is connected to be reduced the detection time of interrupting significantly, go out any bar SCTP link connection interruption than retransmit the more accurate fast detecting of surveying of mode by message, and in time adjusted the transmission link of business datum, thereby significantly reduced and detect SCTP and connect traffic lost in the intercourse.
Description of drawings
Fig. 1 is a kind of method flow diagram that detects link down that the embodiment of the invention provides;
Fig. 2 is the general header structure schematic diagram of the ABORT message of Stream Control Transmission Protocol in the embodiment of the invention;
Fig. 3 is a kind of device structure schematic diagram that detects link down that the embodiment of the invention provides;
Fig. 4 is a kind of apparatus embodiments one structural representation that detects link down provided by the invention;
Fig. 5 is a kind of apparatus embodiments two structural representations that detect link down provided by the invention;
Fig. 6 is a kind of system configuration schematic diagram that detects link down that the embodiment of the invention provides.
Embodiment
The embodiment of the invention provides a kind of method that detects link down, be not need Stream Control Transmission Protocol is expanded change, the connection ability of maintenance of utilizing Stream Control Transmission Protocol self to have, at link-attached first communication equipment of SCTP, be that local terminal communication equipment one side is when having detected the SCTP link and connecting aborted, then immediately to opposite end second communication equipment, it is the link-attached apparatus for remote communication of described SCTP, send legal SCTP and connect interrupt message, such as forced interruption connection message (ABORT), the SCTP link that the notice apparatus for remote communication is dismantled and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection, connect such as between local terminal communication equipment and apparatus for remote communication, having set up a plurality of SCTP links, just the business datum of bearing on the SCTP link that has interrupted is forwarded on other normal standby SCTP link that connects to avoid professional loss, apparatus for remote communication does not just need the interruption by long detection ability perception SCTP link like this.
As shown in Figure 1, the inventive method embodiment one provides a kind of method that detects link down, comprises the steps:
101, the SCTP link connection status between detection of first communication equipment and the second communication equipment.
Concrete, first communication equipment in system, promptly in the local terminal communication equipment can by a SCTP link monitoring module concentrate to all treatment S CTP protocol with hardware be connected link and monitor;
Perhaps by being a SCTP link monitoring module of treatment S CTP protocol with hardware configuration in first communication equipment, to the adjacent treatment S CTP protocol with hardware of described treatment S CTP protocol with hardware be connected link and monitor.Promptly all dispose a SCTP link monitoring module in the integrated circuit board hardware for each the treatment S CTP agreement in first communication equipment, respectively the integrated circuit board hardware and the connection link thereof of adjacent treatment S CTP agreement are monitored mutually.There is the integrated circuit board 1,2,3,4 of treatment S CTP agreement to be installed in successively on the same frame such as the local terminal communication equipment, a SCTP link monitoring module is set in integrated circuit board 1, be used for adjacent integrated circuit board 2 and SCTP connection link thereof are monitored, and a SCTP link monitoring module is set in integrated circuit board 2, be used for adjacent integrated circuit board 1 and SCTP connection link thereof are monitored, monitor mutually between the adjacent like this integrated circuit board, can more effective detection SCTP link down fault.Certainly the mode of SCTP link monitoring block configuration can be at practical communication equipment flexible design.
102, when having detected SCTP link connection aborted in described first communication equipment, one side, then generate SCTP and connect the described second communication equipment that interrupt message sends the opposite end to, the SCTP link of notifying described second communication equipment to dismantle and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the SCTP link of standby normal connection.
Usually in the IP network communication system, adopt Stream Control Transmission Protocol transmission data, can be between first communication equipment and second communication equipment, be that many standby SCTP links of configuration connect and carry out professional load sharing between local terminal communication equipment and the apparatus for remote communication, should standby SCTP link connects to other the business reorganization of bearing immediately during a certain link down in this group SCTP link connects on.Under many circumstances, fault has taken place in a veneer such as treatment S CTP agreement, perhaps IP network route lines fault, the capital causes that the SCTP link connects interruption and takes place, cause transmitting data interruption, at this moment the SCTP link monitoring module in the local terminal communication equipment, can judge by real-time monitoring scanning malfunction routine is transmission data interruption on which bar SCTP link of which veneer at once, again according to before checking label, IP address, the port number information of described relevant SCTP link of record generate the forced interruption connection message and send to corresponding apparatus for remote communication.
Identification informations such as the checking label (Verification Tag) when this SCTP link monitoring module can write down described relevant SCTP link establishment, IP address, port numbers, such as when every SCTP link connection is set up, Stream Control Transmission Protocol connects at every SCTP link all can generate the checking label, the SCTP link connects verifies when setting up that label all can be different at every turn, and that is to say has no progeny to rebuild in the SCTP connection again generally can use new checking label.The link-attached communication equipment of SCTP connects the checking label when foundation/reconstruction SCTP link connects together with SCTP out of Memory, comprise local terminal address, this section port numbers, far-end address, distal end slogan, send to SCTP link monitoring module records together and preserve.
Such as, have in the network when being numbered 3 SCTP link and connecting aborted when detecting in local terminal communication equipment one side, described SCTP link monitoring module according to before the information such as the checking label that is numbered 3 SCTP link, local terminal IP address, source port number, far-end IP address, destination slogan of record generate legal forced interruption connection message, be ABORT message, specifically referring to the general header structure of ABORT message of Stream Control Transmission Protocol among Fig. 2.And connection line or the standby SCTP link of forced interruption connection message by other special use sent to the apparatus for remote communication that is numbered 3 SCTP link opposite end, the i.e. destination device of transfer of data.
After described apparatus for remote communication is received the forced interruption connection message, 3 the SCTP link of being numbered of dismantling immediately and having interrupted, and the business datum that is numbered on 3 the SCTP link forwarded on the standby SCTP link 1 of normal connection.
First communication equipment also can utilize bidirectional transmission detecting protocol BFD to detect SCTP Link State between first communication equipment and the second communication equipment in the present embodiment.Particularly, if the local terminal communication equipment utilizes bidirectional transmission detecting protocol (BFD, Bi-Directional Forwarding Detection) detects that communication line interrupts between two physical layer of device, then also can follow interruption based on the SCTP link connection of this communication line, at this moment handle the equipment plate card of described bidirectional transmission detecting protocol and can notify described SCTP link monitoring module that the SCTP link down is arranged, described SCTP link monitoring module is according to the checking label of the described relevant SCTP link that writes down before, the IP address, port number information generates the forced interruption connection message and sends to corresponding apparatus for remote communication.
Adopt the inventive method embodiment one, can under the situation that does not change Stream Control Transmission Protocol, do not need apparatus for remote communication to cooperate, make SCTP connect the far-end that interrupts and reduce significantly detection time, thereby reduce the unusual loss late that corresponding SCTP connects message transfer.
The inventive method embodiment two provides a kind of method that detects link down, implementation step is identical with embodiment one, its difference is when detecting in local terminal communication equipment one side when having the SCTP link to connect aborted in the network, then SCTP link monitoring module generates Internet Control Message Protocol (ICMP, InternetControl Message Protocol) the unreachable message (DUM of purpose, Destination UnreachableMessage) sends the apparatus for remote communication of opposite end to, the SCTP link of notifying described apparatus for remote communication to dismantle to have interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the SCTP link of standby normal connection.The unreachable message of the purpose of described Internet Control Message Protocol comprises checking label, IP address, port number information of the described SCTP link that has interrupted etc.
The method of employing method embodiment two exists certain destructive, may directly cause the IP path of bottom to be interrupted, and at this moment needs the link-attached remote equipment of SCTP to implement protection mechanism.Interrupting after SCTP connects such as the apparatus for remote communication of the unreachable message of purpose of receiving above-mentioned ICMP agreement, whether the ECHO message that sends ICMP is surveyed the local terminal communication equipment and can be reached, and recovers bottom IP path path after waiting for the ECHO response message; Receive that perhaps the unreachable message of above-mentioned purpose just interrupts the SCTP link and connect, and do not carry out bottom IP path operations.
The inventive method embodiment three provides a kind of method that detects link down, implementation step is identical with embodiment one, its difference is to detect when having the SCTP link to connect aborted in the network in local terminal communication equipment one side when SCTP link monitoring module, then utilize the Stream Control Transmission Protocol after expanding, or M3UA, or H.248 agreement generates the apparatus for remote communication that SCTP connection interrupt message notice sends to the opposite end, the SCTP link of notifying described apparatus for remote communication to dismantle to have interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the SCTP link of standby normal connection.Described SCTP connects checking label, IP address, the port number information that the interrupt message notification package contains the described SCTP link that has interrupted.
As shown in Figure 3, the embodiment of the invention provides a kind of communication equipment 30 that detects link down, and it comprises:
At least one SCTP SCTP link monitoring module 31, be used to detect the SCTP link connection status between self communication equipment and the opposite end second communication equipment that links to each other, when having detected the SCTP link in self communication equipment one side and connect aborted, then generate SCTP and connect interrupt message;
Described SCTP link monitoring module 31 comprises:
Monitoring means 312 is used for the relevant SCTP link connection status of monitoring scanning;
As shown in Figure 4, described SCTP link monitoring module 31 is arranged on described self communication equipment 30 1 side, be used for concentrating to the integrated circuit board hardware of all treatment S CTP agreements be connected link and monitor;
As shown in Figure 5, perhaps described SCTP connects monitoring modular 31 and distributes in the integrated circuit board hardware of each treatment S CTP agreement of being arranged on described self communication equipment 30 1 side, is used for adjacent treatment S CTP protocol with hardware and connects link monitoring mutually.
As shown in Figure 6, the embodiment of the invention provides a kind of system that detects link down, and it comprises
First communication equipment, it is the local terminal communication equipment, be used for by at least one SCTP SCTP link monitoring module detection of setting and the SCTP link connection status between the second communication equipment, connect aborted if detected the SCTP link, then generate SCTP connection interrupt message and send opposite end second communication equipment to by notification module;
Second communication equipment, it is apparatus for remote communication, be used for setting up many SCTP and be connected link with described first communication equipment, and when receiving described SCTP when connecting interrupt message, the SCTP link of dismantling and having interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the SCTP link of standby normal connection.
First communication equipment and second communication equipment can be above-mentioned communication equipment 30, and local terminal communication equipment among Fig. 6 and apparatus for remote communication are numbered 1,2,3,4 SCTP link by many and insert IP network and communicate.
One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
Adopt the embodiment of the invention described above, when connecting aborted by detected the SCTP link in local terminal communication equipment one side, then generate SCTP immediately and connect the SCTP link that interrupt message notice apparatus for remote communication is dismantled and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on SCTP link of other normal connection, the SCTP link is connected to be reduced the detection time of interrupting significantly, go out any bar SCTP link connection interruption than retransmit the more accurate fast detecting of surveying of mode by message, and in time adjusted the transmission link of business datum, thereby significantly reduced and detect SCTP and connect traffic lost in the intercourse.
The above is a preferred implementation of the present invention; certainly can not limit the present invention's interest field with this; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvement, these improvement and change also are considered as protection scope of the present invention.
Claims (10)
1, a kind of method that detects link down is characterized in that, comprising:
SCTP SCTP link connection status between detection of first communication equipment and the second communication equipment;
When having detected SCTP link connection aborted, then generate SCTP and connect the described second communication equipment that interrupt message sends the opposite end to, the SCTP link of notifying described second communication equipment to dismantle and interrupted, and the business datum on the SCTP link that has interrupted is transferred on the standby SCTP link of normal connection.
2, method according to claim 1, it is characterized in that, described first communication equipment detect with second communication equipment between SCTP link connection status comprise: by a SCTP link monitoring module concentrated to all treatment S CTP protocol with hardware in described first communication equipment be connected link and monitor; Perhaps by being a SCTP link monitoring module of treatment S CTP protocol with hardware configuration in first communication equipment, to adjacent treatment S CTP protocol with hardware be connected link and monitor.
3, method according to claim 1, it is characterized in that, described first communication equipment detect and second communication equipment between SCTP link connection status comprise: first communication equipment utilizes bidirectional transmission detecting protocol BFD to detect SCTP Link State between first communication equipment and the second communication equipment.
4, according to claim 1,2 or 3 described methods, it is characterized in that, described when having detected the SCTP link in first communication equipment, one side and connect aborted, then generate SCTP and connect the step that interrupt message sends the described second communication equipment in opposite end to and further comprise:
When having detected SCTP link connection aborted in first communication equipment, one side, then checking label, IP address, the port number information according to the described relevant SCTP link that writes down before generates SCTP connection interrupt message, sends the described second communication equipment in opposite end to.
5, method according to claim 1 is characterized in that, it is the forced interruption connection message that includes SCTP link connection identifier information that described SCTP connects interrupt message; Perhaps be the unreachable message of purpose that includes the ICMP agreement of SCTP link connection identifier information.
6, method according to claim 1, it is characterized in that, described SCTP connects interrupt message and connects the interrupt message notice for expansion Stream Control Transmission Protocol, M3UA, the SCTP that H.248 generates after any one agreement in the agreement, and described SCTP connects checking label, IP address, the port number information that the interrupt message notification package contains the described SCTP link that has interrupted.
7, a kind of communication equipment that detects link down is characterized in that, comprising:
At least one SCTP SCTP link monitoring module, be used to detect the SCTP link connection status between self communication equipment and the opposite end second communication equipment that links to each other, when having detected the SCTP link in self communication equipment one side and connect aborted, then generate SCTP and connect interrupt message;
Notification module, be used for that described SCTP is connected interrupt message and send to described opposite end second communication equipment, notify the described opposite end SCTP link that second communication equipment is dismantled and interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection.
8, communication equipment according to claim 7 is characterized in that, described SCTP link monitoring module comprises:
Memory cell is used to write down the relevant link-attached identification information of SCTP;
Monitoring means is used for the relevant SCTP link connection status of monitoring scanning;
Processing unit is used for when detecting network and have the SCTP link to connect aborted, then according to before the link-attached identification information of described relevant SCTP of record, generate SCTP and connect interrupt message.
9, communication equipment according to claim 7 is characterized in that, described SCTP link monitoring module is arranged on described self communication equipment one side, be used for concentrating to all treatment S CTP protocol with hardware be connected link and monitor; Perhaps described SCTP connects monitoring modular and distributes and be arranged in each treatment S CTP protocol with hardware of described self communication equipment one side, is used for adjacent treatment S CTP protocol with hardware and connects link monitoring mutually.
10, a kind of system that detects link down is characterized in that, comprising:
First communication equipment, be used for by at least one SCTP SCTP link monitoring module detection of setting and the SCTP link connection status between the second communication equipment, connect aborted if detected the SCTP link, then generate SCTP connection interrupt message and send opposite end second communication equipment to by notification module;
Second communication equipment, be used for setting up many SCTP and be connected link with described first communication equipment, and when receiving described SCTP when connecting interrupt message, the SCTP link of dismantling and having interrupted, and the business datum on the SCTP link that has interrupted is forwarded on the standby SCTP link of normal connection.
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| CN2008102207307A CN101459541B (en) | 2008-12-31 | 2008-12-31 | Method, equipment and system for detecting link break |
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| CN2008102207307A CN101459541B (en) | 2008-12-31 | 2008-12-31 | Method, equipment and system for detecting link break |
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| CN106255039A (en) * | 2016-08-08 | 2016-12-21 | 飞天诚信科技股份有限公司 | A kind of mobile terminal that detects is connected the method and device of exception with the non-smart card that connects |
| CN106255039B (en) * | 2016-08-08 | 2018-11-20 | 飞天诚信科技股份有限公司 | It is a kind of to detect mobile terminal and the non-method and device for connecing smart card and connecting exception |
| CN110620626B (en) * | 2019-09-29 | 2022-03-11 | 广州海格通信集团股份有限公司 | Automatic frequency selection method and device |
| CN110620626A (en) * | 2019-09-29 | 2019-12-27 | 广州海格通信集团股份有限公司 | Automatic frequency selection method and device |
| CN110808873A (en) * | 2019-10-21 | 2020-02-18 | 锐捷网络股份有限公司 | Method and device for detecting link failure |
| CN110808873B (en) * | 2019-10-21 | 2022-02-22 | 锐捷网络股份有限公司 | Method and device for detecting link failure |
| CN113225762A (en) * | 2020-02-04 | 2021-08-06 | 大唐移动通信设备有限公司 | Method and device for establishing stream control transmission protocol link |
| CN113225762B (en) * | 2020-02-04 | 2022-11-22 | 大唐移动通信设备有限公司 | Method and device for establishing stream control transmission protocol link |
| CN113453248A (en) * | 2020-03-27 | 2021-09-28 | 大唐移动通信设备有限公司 | Method and device for deleting stream control transmission protocol link |
| CN113453248B (en) * | 2020-03-27 | 2022-11-15 | 大唐移动通信设备有限公司 | Method and device for deleting stream control transmission protocol link |
| CN113315802A (en) * | 2020-07-27 | 2021-08-27 | 阿里巴巴集团控股有限公司 | Method, device and equipment for processing network link abnormity |
| WO2022062407A1 (en) * | 2020-09-27 | 2022-03-31 | 浙江三维利普维网络有限公司 | Link monitoring method and apparatus, and storage medium and electronic apparatus |
| CN112788696A (en) * | 2020-12-31 | 2021-05-11 | 北京工业大学 | Communication delay reduction method and system for switching wireless network of mobile terminal in area |
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