CN101729292A - Method and system for protecting access node, link and user service - Google Patents
Method and system for protecting access node, link and user service Download PDFInfo
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- CN101729292A CN101729292A CN200910147562A CN200910147562A CN101729292A CN 101729292 A CN101729292 A CN 101729292A CN 200910147562 A CN200910147562 A CN 200910147562A CN 200910147562 A CN200910147562 A CN 200910147562A CN 101729292 A CN101729292 A CN 101729292A
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Abstract
The invention discloses a method and a system for protecting an access node, a link and user service. The protection method comprises the following steps of: establishing a peer relation among different access nodes and informing the peer relation to a service control node; synchronously transmitting the service information to the peer of the access node by the service control node when the service control node transmits the user service information to the access node; and switching the service data stream of the user to the peer of the access node and the corresponding link from the access node and the link connected with the access node when the access node or the link connected with the access node goes wrong. The invention can effectively improve the protective ability of the access node and the link and synchronously ensure the consistency of the service quality.
Description
Technical field
The present invention relates to data communication field, relate in particular to the guard method and the system of a kind of access node, link and customer service.
Background technology
Develop rapidly along with data communication industry, the high reliability demand of telecommunication service is also in continuous lifting, data core layer, convergence-level are constantly promoting reliability, because the network layer that relates to is away from the user, what correlation technique was paid close attention to all is the reliability requirement of network level, to network access layer (particularly access node, i.e. Access Node, be called for short AN) and user's (particularly access link, i.e. Local Loop) reliability concerns few.
Access node and link are near user's part in the network architecture, user gateway equipment is connected in the carrier network by access link and access node, thereby the purpose of other miscellaneous service that provides by carrier network use internet service, enterprise VPN business or service provider is provided.
Present access technology has DSL (Digital Subscriber Loop, Digital Subscriber Loop) access, PON (Passive Optical Network, passive optical-fiber network) access, Ethernet insert, WiMAX (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave inserts) and wireless access etc., corresponding access node is DSLAM, OLT/ONU, Ethernet switch, WiMAX and wireless base station etc.At present except WiMAX and wireless access that employing eats dishes without rice or wine to insert, the method that access node and link are protected seldom, for the protection of customer service still less.
Be applied as example with the present ADSL of family (it is a kind of that DSL inserts for Asymmetrical Digital Subscriber Loop, ADSL (Asymmetric Digital Subscriber Line)) access: access node is DSLAM, and access link is an adsl link.Present network protection technology can be accomplished; when certain equipment of the up link of DSLAM or up connection breaks down; the flow that makes progress from DSLAM can switch to the equipment of another DSLAM uplink, thus guarantee flow between DSLAM and upstream plant do not interrupt transmission.
And when the link occurs fault between DSLAM itself or DSLAM and user's home gateway, this user's flow can produce interruption, is not restored in a period of time as fault, and the user will be forced to roll off the production line so, and all customer services are interrupted; The generation of access node or link failure, can cause losing of customer flow, and then cause the interruption of customer service, and the method for simple redundant node can't accomplish user service information between main-standby nodes synchronously in real time, thereby can't guarantee the taking over seamlessly of customer service (promptly can't guarantee the self-consistentency of the business information such as bandwidth, multicast service, service quality of user after the failover).
Summary of the invention
The technical problem to be solved in the present invention is exactly guard method and the system that proposes a kind of access node, link and customer service; solve in the prior art when between access node itself or access node and the user gateway during link occurs fault; cause the problem that customer service is interrupted or customer service can't take over seamlessly, can effectively improve the protective capability of access node and link.
In order to solve the problems of the technologies described above, the invention provides the guard method of a kind of access node, link and customer service, comprising:
Set up " peer-to-peer " relation between the different access nodes, and described " peer-to-peer " concerned the informing business Control Node;
The business information that business control nodes issues the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously;
When link occurs fault that access node or its link to each other, with user's business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node.
Further, described guard method also can have following characteristics:
Set up " peer-to-peer " relation between the described different access node, and described " peer-to-peer " concerned that the step of informing business Control Node specifically comprises:
Mutually redundant two access nodes configuration the other side is self " peer-to-peer ";
When the control information of access node and its corresponding service Control Node is mutual, with the described business control nodes of " peer-to-peer " information notification of self.
Further, described guard method also can have following characteristics:
The mode that described mutually redundant two access nodes issue by static configuration or webmaster disposes " peer-to-peer " of the other side for self; And according to the relation of access node and its " peer-to-peer ", the upstream Interface of user gateway is statically configured as active and standby with relation.
Further, described guard method also can have following characteristics:
The access node that described access node and its " peer-to-peer " are different network type;
Described business control nodes and described access node and " peer-to-peer " thereof are appointed the consolidation form of issuing service information;
Described business control nodes is issued to described access node and its " peer-to-peer " based on the described consolidation form of appointing synchronously with described business information.
Further, described guard method also can have following characteristics:
When the link fault-free that access node links to each other with it, same user's partial service data flow is diverted on its " peer-to-peer " and the link corresponding.
Further, described guard method also can have following characteristics:
When access link breaks down, described access node informing business Control Node link failure, and user gateway detects link failure, and business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node; Described access link is the link that access node links to each other with user gateway.
Further, described guard method also can have following characteristics:
When described access node breaks down, described business control nodes and user gateway all detect fault, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
Further, described guard method also can have following characteristics:
When the up link of described access node breaks down, described business control nodes detects link failure, and described access node informs that user gateway or access node initiatively close the access link that links to each other with user gateway, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
Further, described guard method also can have following characteristics:
After described fault recovery, user's business datum flowed back to switch to original path and get on, return to the state before fault takes place.
In order to solve the problems of the technologies described above, the invention provides the protection system of a kind of access node, link and customer service, comprise business control nodes, at least two access nodes and user gateway,
Described access node links to each other with user gateway with described business control nodes respectively, is used for setting up " peer-to-peer " relation with other access node of described protection system, and described " peer-to-peer " concerned the informing business Control Node;
The business information that business control nodes is used to issue the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously; And, when link occurs fault that described access node or its link to each other, with user's descending business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node;
During link occurs fault that described user gateway is used for linking to each other when described access node or its, with user's up business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node.
The present invention is on the basis of original network protection technology; protection demand at access node and link; proposition is based on the access node of access node " peer-to-peer " relation and the exchange method between the business control nodes; can effectively improve the protective capability of access node and link, ensure the consistency of quality of service simultaneously.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention;
Fig. 2 is the network topology schematic diagram of the embodiment of the invention;
Fig. 3 is that the present invention uses the peer-to-peer foundation of example and the schematic flow sheet that user service information issues process;
Fig. 4 is that the present invention is the schematic flow sheet that example realizes protection mechanism with the access link fault;
To be the present invention revert to example with access link fault to Fig. 5 realizes that flow returns the schematic flow sheet of cutting;
Fig. 6 is that the present invention is the schematic flow sheet that example realizes protection mechanism with the access node fault;
Fig. 7 is that the present invention is that example realizes that flow returns the schematic flow sheet of cutting with the access node fault recovery;
Fig. 8 is that the present invention is the schematic flow sheet that example realizes protection mechanism with the access node uplink failure;
To be the present invention revert to example with the access node uplink failure to Fig. 9 realizes that flow returns the schematic flow sheet of cutting.
Embodiment
At DSL access, PON access, Ethernet access etc. line access mode is arranged, its customer service has the characteristics of self.From user perspective, the user wishes that operator can provide variable individual business in real time, as Web TV, video request program, bandwidth varying or the like as required, makes the user can customize own required various services at any time.From operator's angle, for this network with real-time, individual business customization capability is provided, ensure the reasonable distribution (as bandwidth availability ratio, service quality etc.) of Internet resources simultaneously, must get on by the network equipment (as access node) that is saved near the user that user's business information is real-time, when ensureing user's end-to-end quality of service, improve network resource utilization (as customer flow control).Under above this scene, if protection access node and access link, must be on the basis of simple physically-redundant, guarantee user service information between the active and standby access node synchronously in real time, thereby reach the purpose that fault takes over seamlessly.
What traditional guard method was adopted is the method for the two up links of access node, can only protect the up link of access node, can't protect access node and descending access link thereof.And what adopt for the protection of user gateway is two methods that are up to the access node of different operators network, can't accomplish the protection in the same operator.
The operation principle of the guard method of access node of the present invention and link is to set up " peer-to-peer " relation between different access nodes; and should concern the informing business Control Node; by business control nodes and two information interaction of the access node of " peer-to-peer " each other; realize user service information between different access nodes synchronously in real time, the taking over seamlessly of protection when being implemented in access node and link failure and customer service.
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, the method for the embodiment of the invention comprises the steps:
Step 101 is set up " peer-to-peer " relation between the different access nodes, and described " peer-to-peer " concerned the informing business Control Node;
Wherein, this step specifically comprises:
(a) go up the redundance unit of appointment the other side for oneself, that is: " peer-to-peer " at mutually redundant two access node apparatus (being access node);
Certainly, an access node is also specified " peer-to-peer " of a plurality of other access nodes for self, but generally, an access node has one " peer-to-peer " just enough;
Wherein, described " peer-to-peer " is with the difference of traditional stand-by equipment, " peer-to-peer " also is the access node in the work, access node and its " peer-to-peer " all are the equipment that works alone, all be used to transmit user's business data flow, and just be used for Backup Data unlike traditional stand-by equipment;
Described mutually redundant two access nodes can dispose " peer-to-peer " of the other side for self by the mode that static configuration or webmaster issue; And according to the relation of above-mentioned access node and its " peer-to-peer ", the upstream Interface of user gateway is statically configured as active and standby with relation; When detecting the master with uplink failure, user gateway switches to reserve link; For different business, the active and standby relation of using between upstream Interface can be different, to reach the shunting effect based on different business;
(b) at business control nodes (the Service Node of access node and its corresponding upper, be called for short SN, as BAS Broadband Access Server, business router etc.) control information when mutual (as ANCP agreement etc.), with the described business control nodes of " peer-to-peer " information notification of self.
Described " peer-to-peer " information generally is meant: the IP address of " peer-to-peer ";
The business information that step 102, business control nodes issue the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously;
Described user's business information specifically comprises bandwidth, multicast service, service quality of user etc.;
The access node (as DSLAM, OLT/ONU, Ethernet switch, WiMAX, wireless base station etc.) that described access node and its " peer-to-peer " can be different network types; Described business control nodes can be appointed the consolidation form of issuing service information with described access node and " peer-to-peer " thereof, and based on the described consolidation form of appointing, described business information is issued to described access node and its " peer-to-peer " synchronously; Like this, business control nodes just need not to distinguish network type, and the business information that directly issues consolidation form gets final product;
Step 103 is when link occurs fault that access node or its link to each other, with user's business data flow " peer-to-peer " and the link corresponding from described access node and continuous link switchover thereof to described access node; Because " peer-to-peer " of described access node has the user's of described access node business information, so user's business information can be consistent before and after switching;
Particularly, when link occurs fault that access node or its link to each other, business control nodes is with user's descending business data flow " peer-to-peer " and the link corresponding from described access node and continuous link switchover thereof to described access node; User gateway is with user's up business data flow " peer-to-peer " and the link corresponding from described access node and continuous link switchover thereof to described access node;
Preferably, when the access link that links to each other with user gateway when described access node breaks down, described access node informing business Control Node link failure, and user gateway detects link failure, and business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
Preferably, when described access node breaks down, described business control nodes and user gateway all detect fault, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
Preferably; the present invention not only can protect access node and access link; can also protect the up link of access node: when the up link of described access node breaks down; described business control nodes detects link failure; and described access node informs that user gateway or access node initiatively close the access link that links to each other with user gateway, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
Preferably, after described fault recovery, user's business datum flowed back to switch to original path and get on, return to the state before fault takes place.
Preferably, when the link fault-free that access node links to each other with it, same user's partial service data flow is diverted on its " peer-to-peer " and the link corresponding, like this, when link occurs fault that access node or its link to each other, that can guarantee partial service does not interrupt transmission fully.
The protection system of the embodiment of the invention comprises business control nodes, at least two access nodes and user gateway, as shown in Figure 2,
Described access node links to each other with user gateway with described business control nodes respectively, is used for setting up " peer-to-peer " relation with other access node of described protection system, and described " peer-to-peer " concerned the informing business Control Node;
The business information that business control nodes is used to issue the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously; And, when link occurs fault that described access node or its link to each other, with user's descending business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node;
During link occurs fault that described user gateway is used for linking to each other when described access node or its, with user's up business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node.
Introduce three the application examples of the present invention under the different faults type below respectively.
First uses example
As Fig. 3～shown in Figure 5, when access link breaks down, send fault notification to SN by AN equipment, realize that user's up-downgoing flow switches to the purpose of " peer-to-peer " AN.
Step is as follows:
Steps A 1, AN1, AN2 dispose the other side's " peer-to-peer " modes such as (static configuration, webmaster) issuing for oneself respectively;
Step B1, AN1, AN2 set up control messages with SN equipment respectively and are connected (as ANCP etc.), simultaneously " peer-to-peer " information (as IP address etc.) of oneself are informed SN;
Step C1, user reach the standard grade and use business, and SN is with user's business information real time down to two AN;
Step D1, when AN1 an access link when breaking down, AN1 informs SN by failure notice message, the user gateway Equipment Inspection is to access link fault simultaneously;
Step e 1, SN mails to AN2 with the downlink traffic (being user's descending business data flow) of this link correspondence, and user gateway equipment mails to AN2 with the uplink traffic on this link (being user's up business data flow);
Step F 1, after the access link fault under the AN1 recovered, AN1 informed SN by fault recovery message, user gateway Equipment Inspection simultaneously recovers to access link fault;
Step G1, SN mails to AN1 with the downlink traffic of former this link correspondence, and user gateway equipment mails to AN1 with the uplink traffic on this link simultaneously.
Second uses example
As Fig. 3, Fig. 6～shown in Figure 7, when access node breaks down,, realize that user's up-downgoing flow switches to the purpose of " peer-to-peer " AN by the detection mechanism between SN and the AN.
Step following (step before fault takes place is used example with first):
Steps A 1, AN1, AN2 dispose the other side's " peer-to-peer " modes such as (static configuration, webmaster) issuing for oneself respectively;
Step B1, AN1, AN2 set up control messages with SN equipment respectively and are connected (as ANCP etc.), simultaneously " peer-to-peer " information (as IP address etc.) of oneself are informed SN;
Step C1, user reach the standard grade and use business, and SN is with user's business information real time down to two AN;
Step D2, when AN1 broke down, SN detected fault by the detection mechanism between SN and the AN1, and the user gateway Equipment Inspection is to access link fault simultaneously;
Step e 2, SN mails to AN2 with the downlink traffic that all mail to AN1, and user gateway equipment mails to AN2 with the uplink traffic on this link simultaneously;
Step F 2, after the fault recovery under the AN1, AN1 can set up control messages with SN again and be connected, and user gateway Equipment Inspection simultaneously recovers to access link fault;
Step G2, after connection was set up successfully, SN mail to AN1 with the downlink traffic of former AN1 correspondence, and user gateway equipment mails to AN1 with the uplink traffic on this link simultaneously.
The 3rd uses example
As Fig. 3, Fig. 8～shown in Figure 9, when the access node up link breaks down,, realize that user's up-downgoing flow switches to the purpose of " peer-to-peer " AN by the detection mechanism between SN and the AN.
Step following (step before fault takes place is used example with first):
Steps A 1, AN1, AN2 dispose the other side's " peer-to-peer " modes such as (static configuration, webmaster) issuing for oneself respectively;
Step B1, AN1, AN2 set up control messages with SN equipment respectively and are connected (as ANCP etc.), simultaneously " peer-to-peer " information (as IP address etc.) of oneself are informed SN;
Step C1, user reach the standard grade and use business, and SN is with user's business information real time down to two AN;
Step D3, when the AN1 up link broke down, SN detected fault by the detection mechanism between SN and the AN1, and AN1 initiatively blocks all the descending access link of oneself simultaneously;
Step e 3, SN mails to AN2 with the downlink traffic that all mail to AN1, and the user gateway Equipment Inspection is to access link fault simultaneously;
Step F 3, user gateway equipment mails to AN2 with the uplink traffic on this link;
Step G3, after the fault recovery of AN1 up link, AN1 can set up control messages with SN again and be connected, and AN1 reopens all the descending access link of oneself simultaneously;
Step H3, after connection was set up successfully, SN mail to AN1 with the downlink traffic of former AN1 correspondence, and user gateway Equipment Inspection simultaneously recovers to access link fault;
Step I3, user gateway equipment mails to AN1 with the uplink traffic on this link.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the guard method of an access node, link and customer service is characterized in that, comprising:
Set up " peer-to-peer " relation between the different access nodes, and described " peer-to-peer " concerned the informing business Control Node;
The business information that business control nodes issues the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously;
When link occurs fault that access node or its link to each other, with user's business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node.
2. guard method as claimed in claim 1 is characterized in that,
Set up " peer-to-peer " relation between the described different access node, and described " peer-to-peer " concerned that the step of informing business Control Node specifically comprises:
Mutually redundant two access nodes configuration the other side is self " peer-to-peer ";
When the control information of access node and its corresponding service Control Node is mutual, with the described business control nodes of " peer-to-peer " information notification of self.
3. guard method as claimed in claim 2 is characterized in that,
The mode that described mutually redundant two access nodes issue by static configuration or webmaster disposes " peer-to-peer " of the other side for self; And according to the relation of access node and its " peer-to-peer ", the upstream Interface of user gateway is statically configured as active and standby with relation.
4. guard method as claimed in claim 1 is characterized in that,
The access node that described access node and its " peer-to-peer " are different network type;
Described business control nodes and described access node and " peer-to-peer " thereof are appointed the consolidation form of issuing service information;
Described business control nodes is issued to described access node and its " peer-to-peer " based on the described consolidation form of appointing synchronously with described business information.
5. guard method as claimed in claim 1 is characterized in that,
When the link fault-free that access node links to each other with it, same user's partial service data flow is diverted on its " peer-to-peer " and the link corresponding.
6. guard method as claimed in claim 1 is characterized in that,
When access link breaks down, described access node informing business Control Node link failure, and user gateway detects link failure, and business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node; Described access link is the link that access node links to each other with user gateway.
7. guard method as claimed in claim 1 is characterized in that,
When described access node breaks down, described business control nodes and user gateway all detect fault, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
8. guard method as claimed in claim 1 is characterized in that,
When the up link of described access node breaks down, described business control nodes detects link failure, and described access node informs that user gateway or access node initiatively close the access link that links to each other with user gateway, and described business control nodes and user gateway are with user's business data flow " peer-to-peer " and the link corresponding from described access node and the link switchover that links to each other thereof to described access node.
9. guard method as claimed in claim 1 is characterized in that, after described fault recovery, user's business datum flowed back to switches to original path and gets on, and returns to the state before fault takes place.
10. the protection system of an access node, link and customer service comprises business control nodes, and at least two access nodes and user gateway is characterized in that,
Described access node links to each other with user gateway with described business control nodes respectively, is used for setting up " peer-to-peer " relation with other access node of described protection system, and described " peer-to-peer " concerned the informing business Control Node;
The business information that business control nodes is used to issue the user is issued to described business information " peer-to-peer " of described access node during to access node synchronously; And, when link occurs fault that described access node or its link to each other, with user's descending business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node;
During link occurs fault that described user gateway is used for linking to each other when described access node or its, with user's up business data flow " peer-to-peer " and link corresponding from described access node and continuous link switchover thereof to described access node.
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| CN200910147562A CN101729292A (en) | 2009-06-15 | 2009-06-15 | Method and system for protecting access node, link and user service |
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| CN200910147562A CN101729292A (en) | 2009-06-15 | 2009-06-15 | Method and system for protecting access node, link and user service |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200599A (en) * | 2012-01-06 | 2013-07-10 | 华为技术有限公司 | Method and device for data transmission |
| CN103248419A (en) * | 2013-05-27 | 2013-08-14 | 瑞斯康达科技发展股份有限公司 | ONU (optical network unit), OLT (optical line terminal), D type PON (passive optical network) protecting system and method |
| CN103888310A (en) * | 2013-09-04 | 2014-06-25 | 中寰卫星导航通信有限公司 | Monitor processing method and system |
| CN107040966A (en) * | 2016-01-28 | 2017-08-11 | 谷歌公司 | The system and method for seamless mobility with the internuncial user conversation of multiple access |
| CN114979780A (en) * | 2022-07-27 | 2022-08-30 | 成都卓元科技有限公司 | Digital television video and audio signal anomaly detection and comparison method |
-
2009
- 2009-06-15 CN CN200910147562A patent/CN101729292A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200599A (en) * | 2012-01-06 | 2013-07-10 | 华为技术有限公司 | Method and device for data transmission |
| WO2013102446A1 (en) * | 2012-01-06 | 2013-07-11 | 华为技术有限公司 | Method and device for transmitting data |
| US9307425B2 (en) | 2012-01-06 | 2016-04-05 | Huawei Technologies Co., Ltd. | Method and device for transferring data |
| CN103248419A (en) * | 2013-05-27 | 2013-08-14 | 瑞斯康达科技发展股份有限公司 | ONU (optical network unit), OLT (optical line terminal), D type PON (passive optical network) protecting system and method |
| CN103248419B (en) * | 2013-05-27 | 2016-01-20 | 瑞斯康达科技发展股份有限公司 | ONU, OLT, D class PON protection system and method |
| CN103888310A (en) * | 2013-09-04 | 2014-06-25 | 中寰卫星导航通信有限公司 | Monitor processing method and system |
| CN107040966A (en) * | 2016-01-28 | 2017-08-11 | 谷歌公司 | The system and method for seamless mobility with the internuncial user conversation of multiple access |
| CN107040966B (en) * | 2016-01-28 | 2021-01-29 | 谷歌有限责任公司 | System and method for seamless mobility of user sessions with multiple access connectivity |
| CN114979780A (en) * | 2022-07-27 | 2022-08-30 | 成都卓元科技有限公司 | Digital television video and audio signal anomaly detection and comparison method |
| CN114979780B (en) * | 2022-07-27 | 2022-11-11 | 成都卓元科技有限公司 | Video and audio signal anomaly detection and quality comparison method for digital television broadcasting system |
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