CN101521614A - Method, device and system for protecting operator backbone transmission service - Google Patents

Method, device and system for protecting operator backbone transmission service Download PDF

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Publication number
CN101521614A
CN101521614A CN200810008353A CN200810008353A CN101521614A CN 101521614 A CN101521614 A CN 101521614A CN 200810008353 A CN200810008353 A CN 200810008353A CN 200810008353 A CN200810008353 A CN 200810008353A CN 101521614 A CN101521614 A CN 101521614A
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Prior art keywords
provider backbone
protection group
business
pbb
vlan
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CN200810008353A
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CN101521614B (en
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魏家宏
李军
梅柳波
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention relates to a method, a device and a system for protecting the operator backbone network transmission service; wherein the method comprises the following steps of: searching a protection group which corresponds to the service and has at least one operator backbone network bridge transmission engineering tunnel and an operator backbone network bridge virtual local area network; detecting whether the malfunction occurs to the operator backbone network bridge transmission engineering tunnel in the protection group or not; if so, the operator backbone network bridge virtual local area network in the protection group is started and used as a backup transmission passage of the operator backbone network bridge transmission engineering tunnel; and sending the service. The method, the device and the system realize the transmission of data frames by sending and receiving on the basis of the protection group, and overcomes the defect that the network survivability in the prior art is low.

Description

Operator backbone transmission service guard method, Apparatus and system
Technical field
The invention belongs to moving communicating field, especially belong to a kind of operator backbone transmission service guard method, Apparatus and system.
Background technology
Provider backbone transmission (Provider BackboneTransport based on the IEEE802.1ah standard, abbreviate PBT as) technology, claim provider backbone bridging transmission engineering (ProviderBackbone Bridge-Transport Engineering again, be designated hereinafter simply as PBB-TE), be on provider backbone bridging (Provider Backbone Bridge is designated hereinafter simply as PBB) standard, to improve.
PBB adopts medium access control medium access control (Media Access Control-in-MediaAccess Control, being designated hereinafter simply as MAC-in-MAC) mode encapsulates, be specially: terminal use's ethernet data frame is packaged into operator's Ethernet frame head again, form two medium access control (MediaAccess Control, be designated hereinafter simply as MAC) address, make that only carrying out flow according to the MAC Address of encapsulation for the second time in the core net of operator transmits.
On the basis of PBB, the PBB-TE technology has adopted static configuration forward-path pattern, simultaneously 1:1 and the 1+1 protection mechanism that also adopts.Share out the work exactly tunnel and the protection of so-called 1:1 protection mechanism belongs to the Frame of certain srvice instance (Service Instance is designated hereinafter simply as SI), the mechanism that another tunnel receives this Frame by one of them tunnel transmission after the tunnel.So-called 1+1 protection mechanism is exactly to share out the work that mechanism, another tunnel by one of them tunnel transmission and receiving data frames is in idle state after tunnel and the protection tunnel, only just can use another tunnel when a tunnel breaks down.
Existing PBB-TE technical disadvantages has: the survivability of network is relatively poor, and when work tunnel all broke down with the protection tunnel, business must be interrupted.
Summary of the invention
The embodiment of the invention provides a kind of operator backbone transmission service guard method, Apparatus and system, with the defective of network survivability difference in the solution prior art, thereby has realized secure provider backbone transmission.
The embodiment of the invention provides a kind of operator backbone transmission service guard method, comprise:, search with professional and have the protection group of at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN accordingly according to the business that receives; Whether the provider backbone bridging transmission engineering tunnel that detects in the protection group breaks down; When provider backbone bridging transmission engineering tunnel breaks down, then start the provider backbone bridging VLAN in the protection group, send professional.
The embodiment of the invention provides a kind of operator backbone transmission service protective device, comprise: search module, be used for according to business, search with professional and have the protection group of at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN accordingly; Detection module, whether the provider backbone bridging transmission engineering tunnel that is used to detect in the protection group breaks down; Protection module is used for breaking down when provider backbone bridging transmission engineering tunnel, then starts the provider backbone bridging VLAN in the protection group, sends professional.
The embodiment of the invention provides a kind of operator backbone transmission service protection system, comprise transmitting apparatus and receiving equipment, transmitting apparatus, be used for based on protection group with at least one provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN, when provider backbone bridging transmission engineering tunnel breaks down, start the provider backbone bridging VLAN in the protection group, send professional; Receiving equipment is used to receive the business that transmitting apparatus sends.
A technical scheme of the embodiment of the invention sends the mode of Frame by the protection group that includes PBB-TE tunnel and PBB VLAN, has realized the transmission to business, has overcome the low defective of network survivability in the prior art.
Another technical scheme of the embodiment of the invention sends the mode of Frame by the protection group that includes PBB-TE tunnel and PBB VLAN, has realized the transmission to business, has overcome the low defective of network survivability in the prior art.
Another technical scheme of the embodiment of the invention by based on the transmitting apparatus of protection group with based on the receiving equipment of protection group, has realized the transmission of Frame, has overcome the low defective of network survivability in the prior art.
Description of drawings
Fig. 1 is the flow chart of a kind of operator backbone transmission service guard method first embodiment of the present invention;
Fig. 2 is the flow chart of a kind of operator backbone transmission service guard method second embodiment of the present invention;
Fig. 3 is a kind of operator backbone transmission service protective device first example structure schematic diagram of the present invention;
Fig. 4 is a kind of operator backbone transmission service protection system first example structure schematic diagram of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
A kind of operator backbone transmission service guard method first embodiment of the present invention
As shown in Figure 1, be the flow chart of a kind of operator backbone transmission service guard method first embodiment of the present invention, this method specifically comprises as follows:
Step 101, according to the port or the Frame feature that insert side, the business that identification is received from access device, i.e. SI under the Frame, the sign of SI is a srvice instance sign (SI-ID).
Step 102; according to the business that receives; search and this business corresponding protection group; this protection group includes a PBB-TE tunnel and a PBB VLAN; the B-SA that each PBB-TE tunnel has unique correspondence in the protection group; B-DA and B-VID; this protection group binds at least one PBB-TE tunnel according to service attribute (attribute of user) and a PBB VLAN forms; be specially: if service attribute is point-to-point (Point to Point; be designated hereinafter simply as P-to-P) business; can be this srvice instance (Service Instance; be designated hereinafter simply as SI) a PBB-TE tunnel of binding and a PBB VLAN; if service attribute is multi-multipoint (Multi Point to Multi Point; be designated hereinafter simply as MP-to-MP) business, then bind a plurality of PBB-TE tunnel and a PBB VLAN for this SI.The PBB-TE tunnel is the bi-directional logical channel of being made up of two unidirectional Ethernet switched path (Ethernet Switched Path is designated hereinafter simply as ESP).
Step 103, detect the PBB-TE tunnel that is used for transport service in this protection group and whether break down; normally; Y.1731 lasting acknowledge message (the ContinuityCheck Message that defines by IEEE 802.1ag or ITU; be designated hereinafter simply as), whether equipment can detect the PBB-TE tunnel and break down.In general, detect the step in PBB-TE tunnel and carry out in real time, promptly can be before with PBB-TE tunnel transport service, or in the middle of the process with PBB-TE tunnel transport service.
Step 104, when described PBB-TE tunnel breaks down, the PBB VLAN that then starts in the described protection group transmits passage as the backup in the PBB-TE tunnel in the described protection group, sends professional.If the service attribute of SI is the P-to-P business, and the PBB-TE tunnel does not break down SI is mapped to the PBB-TE tunnel, use B-DA, B-SA, the B-VID in this PBB-TE tunnel to encapsulate Frame in the described SI, and search according to B-DA, B-VID and to transmit, determine port.If unique PBB-TE tunnel state breaks down in the protection group; or work PBB-TE tunnel all breaks down with protection PBB-TE tunnel in the protection group; service needed is switched; at this moment; when promptly the Frame of this srvice instance being encapsulated; the B-DA, the B-SA that are used for the encapsulation of data frame are constant; original B-VID is made into the B-VID of PBB VLAN in the protection group; and search according to the B-VID of B-DA and PBB VLAN and to transmit; determine port; finish the transmission of user data frame,, then in this PBB VLAN, broadcast this Frame if table look-up failure.
A kind of operator backbone transmission service guard method first embodiment of the present invention; send the mode of Frame by the protection group that includes PBB-TE tunnel and PBB VLAN; realized transmission to business; simultaneously owing to the protection entity of PBB VLAN as the PBB-TE tunnel; therefore when the PBB-TE tunnel goes wrong; switching services is transmitted according to the PBB forward mode to the interior PBB VLAN of this protection group, has realized the protection to business.Because the PBB forward mode calculates forward-path automatically based on multiservice transport platform (Multi-ServiceTransport Platform is designated hereinafter simply as MSTP) technology, thereby has overcome the low defective of prior art survivability, has improved the survivability of network.And a kind of operator backbone transmission service guard method first embodiment of the present invention; specific implementation based on the P-to-P business of protection group; even make P-to-P professional, also can guarantee professional transmission by the PBB VLAN in the protection group because of work PBB-TE tunnel breaks down.
A kind of operator backbone transmission service guard method second embodiment of the present invention
As shown in Figure 2, be the flow chart of a kind of operator backbone transmission service guard method second embodiment of the present invention, this method specifically comprises as follows:
Step 201, according to the port or the Frame feature that insert side, the SI under the recognition data frame, the sign of SI is SI-ID;
Step 202, according to SI-ID, search and this SI-ID corresponding protection group, the protection group includes several PBB-TE tunnels and a PBB VLAN, if the SI attribute is the MP-to-MP business, then this SI understands related a plurality of PBB-TE tunnel, in the repeating process, and need be according to SI-ID and customer objective address (Customer Destination Address, be designated hereinafter simply as C-DA), search the forwarding PBB-TE tunnel of this Frame;
Step 203, behind the forwarding PBB-TE tunnel of specified data frame, adopt B-DA, B-SA, the B-VID in this PBB-TE tunnel that Frame is carried out the MAC-in-MAC encapsulation, and search according to B-DA, B-VID and to transmit, determine port.Before PBB-TE tunnel transport service, perhaps just when transport service, detect the PBB-TE tunnel that is used for transport service in this protection group and whether break down, normally, by the CCM message that Y.1731 IEEE802.1ag or ITU define, whether equipment can detect the PBB-TE tunnel and break down;
Step 204, behind the forwarding PBB-TE tunnel of specified data frame; when transmitting; if find this PBB-TE tunnel fails; service needed is switched; at this moment; when promptly the Frame of this srvice instance being encapsulated; the B-DA, the B-SA that are used for the encapsulation of data frame are constant; original B-VID is made into the B-VID of PBB VLAN in the protection group; and search according to the B-VID of B-DA and PBB VLAN and to transmit, determine port, finish the transmission of user data frame; the failure if table look-up, then this Frame of broadcasting in this PBB VLAN.
A kind of operator backbone transmission service guard method second embodiment of the present invention; the MP-to-MP business has been used the method for protecting the PBB-TE tunnel based on PBB VLAN; even make MP-to-MP professional, also can guarantee professional survivability by the PBB VLAN of protection group because of the PBB-TE tunnel fails.And need not all to dispose a protection PBB-TE tunnel for every PBB-TE tunnel, reduce the workload of configuration to a certain extent, and improved the utilance in PBB-TE tunnel.By the CCM message of IEEE 802.1ag or ITUY.1731 definition, whether equipment can detect the PBB-TE tunnel and break down.
The another kind of operator backbone transmission service guard method of the present invention first embodiment
The another kind of operator backbone transmission service guard method of the present invention first embodiment specifically comprises: by having the protection group of at least one a PBB-TE tunnel and a PBB VLAN, with the backup receive path of PBB VLAN as the PBB-TE tunnel, receive professional.
The another kind of operator backbone transmission service guard method of the present invention first embodiment; the mode of the protection group of received business by including PBB-TE tunnel and PBB VLAN; realized reception to business; simultaneously owing to the protection entity of PBB VLAN as the PBB-TE tunnel; therefore when the PBB-TE tunnel goes wrong; receive business by PBB VLAN, realized protection business.Because the PBB forward mode calculates forward-path automatically based on the MSTP technology, thereby has overcome the low defective of prior art survivability, has improved the survivability of network.Each PBB-TE tunnel has the B-SA of unique correspondence; B-DA and B-VID; this protection group binds at least one PBB-TE tunnel according to service attribute (attribute of user) and a PBBVLAN forms; be specially: if service attribute is the P-to-P business; then be this SI PBB-TE tunnel of binding and a PBB VLAN; if service attribute is the MP-to-MP business, then bind a plurality of PBB-TE tunnel and a PBB VLAN for this SI.The bi-directional logical channel that the PBB-TE tunnel is made up of two unidirectional ESP.
In the another kind of operator backbone transmission service guard method of the present invention first embodiment, by the PBB-TE tunnel of protection group, receiving data frames, described Frame is the Frame after encapsulating through the MAC-in-MAC mode; Perhaps can also be by the PBB VLAN of protection group, receiving data frames, described Frame is the Frame after encapsulating through the MAC-in-MAC mode.After PBB VLAN receiving data frames, can confirm the described SI of Frame according to I-SID
A kind of operator backbone transmission service protective device first embodiment of the present invention
As shown in Figure 3, be a kind of operator backbone transmission service protective device first example structure schematic diagram of the present invention, this device specifically comprises:
Identification module 31 is used to discern the business that receives from access device, is specially to identify this professional SI-ID;
Search module 32, be used for,, search the protection group that has at least one a PBB-TE tunnel and a PBB VLAN with described business accordingly promptly according to described professional SI-ID according to described business;
Detection module 33, whether the PBB-TE tunnel that is used to detect in the described protection group breaks down;
Start unit 34 is used for breaking down when described PBB-TE tunnel, then starts the backup transmission passage of the interior PBB VLAN of described protection group as the PBB-TE tunnel in the described protection group;
Transmitting element 35 is used for sending described business by the PBB VLAN in the described protection group.
A kind of operator backbone transmission service protective device first embodiment of the present invention; send the mode of Frame by the protection group that includes PBB-TE tunnel and PBB VLAN; realized transmission to business; simultaneously owing to the protection entity of PBB VLAN as the PBB-TE tunnel; therefore when the PBB-TE tunnel goes wrong; switching services is transmitted according to the PBB forward mode to the interior PBB VLAN of this protection group, has realized the protection to business.Because the PBB forward mode calculates forward-path automatically based on the MSTP technology, thereby has overcome the low defective of prior art survivability, has improved the survivability of network.Each PBB-TE tunnel has the B-SA of unique correspondence; B-DA and B-VID; this protection group binds at least one PBB-TE tunnel according to service attribute (attribute of user) and a PBB VLAN forms; be specially: if service attribute is the P-to-P business; then be this SI PBB-TE tunnel of binding and a PBB VLAN; if service attribute is the MP-to-MP business, then bind a plurality of PBB-TE tunnel and a PBBVLAN for this SI.The bi-directional logical channel that the PBB-TE tunnel is made up of two unidirectional ESP.In a kind of operator backbone transmission service protective device first embodiment of the present invention, protection module of the common composition of start unit and transmitting element.
The another kind of operator backbone transmission service protective device of the present invention first embodiment
The another kind of operator backbone transmission service protective device of the present invention first embodiment specifically comprises receiving equipment; be used for by having the protection group of at least one a PBB-TE tunnel and a PBB VLAN; with the backup receive path of PBBVLAN, receive professional as the PBB-TE tunnel.
The another kind of operator backbone transmission service protective device of the present invention first embodiment; the mode of the protection group of received Frame by including PBB-TE tunnel and PBB VLAN; realized reception to business; simultaneously owing to the protection entity of PBB VLAN as the PBB-TE tunnel; therefore when the PBB-TE tunnel goes wrong; receive business by PBB VLAN, realized protection business.Because the PBB forward mode calculates forward-path automatically based on the MSTP technology, thereby has overcome the low defective of prior art survivability, has improved the survivability of network.
A kind of operator backbone transmission service protection system first embodiment of the present invention
As shown in Figure 4, be a kind of operator backbone transmission service protection system first example structure schematic diagram of the present invention, this system comprises: transmitting apparatus, be used for based on protection group with at least one provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN, when provider backbone bridging transmission engineering tunnel breaks down, start the provider backbone bridging VLAN in the protection group, send professional; With receiving equipment 41, be used for the backup receive path of PBB VLAN, receiving professional as the PBB-TE tunnel by having the protection group of at least one a PBB-TE tunnel and a PBB VLAN.
Wherein, transmitting apparatus further comprises:
Identification module 31 is used to discern the business that receives from access device;
Search module 32, be used for, search the protection group that has at least one a PBB-TE tunnel and a PBB VLAN with described business accordingly according to described business;
Detection module 33, whether the PBB-TE tunnel that is used to detect in the described protection group breaks down;
Start unit 34 is used for breaking down when described PBB-TE tunnel, then starts the backup transmission passage of the interior PBB VLAN of described protection group as the PBB-TE tunnel in the described protection group;
Transmitting element 35 is used for sending described business by the PBB VLAN in the described protection group.
In a kind of operator backbone transmission service protection system first embodiment of the present invention, among transmitting apparatus and a kind of operator backbone transmission service protective device first embodiment of the present invention by identification module, to search the single unit system that module, detection module and protection module constitute identical; Receiving equipment among the another kind of operator backbone transmission service protective device of receiving equipment and the present invention first embodiment is identical, therefore here the concrete structure of transmitting apparatus and receiving equipment is repeated no more.
A kind of operator backbone transmission service protection system first embodiment of the present invention; by based on the transmitting apparatus of protection group with based on the receiving equipment of protection group; realized the transmission of Frame; simultaneously owing to the protection entity of PBBVLAN as the PBB-TE tunnel; therefore when the PBB-TE tunnel goes wrong; receive professional by PBBVLAN; realized protection to business; thereby overcome prior art and can only rely on PBB-TE tunnel realization data frame transfer; cause the low defective of Network Transmission survivability; guarantee the transmission of SI, but also improved the utilance in PBB-TE tunnel.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1, a kind of operator backbone transmission service guard method is characterized in that comprising:
According to the business that receives, search the protection group that has at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN with described business accordingly;
Whether the provider backbone bridging transmission engineering tunnel that detects in the described protection group breaks down;
When described provider backbone bridging transmission engineering tunnel breaks down, then start the provider backbone bridging VLAN in the described protection group, send described business.
2, operator backbone transmission service guard method according to claim 1; it is characterized in that according to the business that receives, search the protection group that has at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN accordingly with described business and be specially:
According to the srvice instance sign that comprises in the business that receives, search the protection group that has at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN with described business accordingly.
3, operator backbone transmission service guard method according to claim 1 is characterized in that whether provider backbone bridging transmission engineering tunnel in the described protection group of described detection breaks down to be specially:
By continuing acknowledge message, whether the provider backbone bridging transmission engineering tunnel that detects in the described protection group breaks down.
4, a kind of operator backbone transmission service protective device is characterized in that comprising:
Search module, be used for, search the protection group that has at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN with described business accordingly according to described business;
Detection module, whether the provider backbone bridging transmission engineering tunnel that is used to detect in the described protection group breaks down;
Protection module is used for breaking down when described provider backbone bridging transmission engineering tunnel, then starts the provider backbone bridging VLAN in the described protection group, sends described business.
5, the merchant of battalion backbone transmission service protective device according to claim 4 is characterized in that also comprising:
Identification module is used to discern the business that receives from access device.
6, the merchant of battalion backbone transmission service protective device according to claim 4 is characterized in that described protection module specifically comprises:
Start unit is used for breaking down when described provider backbone bridging transmission engineering tunnel, then starts the provider backbone bridging VLAN in the described protection group;
Transmitting element is used for sending described business by described provider backbone bridging VLAN.
7, a kind of operator backbone transmission service protection system is characterized in that comprising transmitting apparatus and receiving equipment,
Described transmitting apparatus, be used for based on protection group with at least one provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN, when described provider backbone bridging transmission engineering tunnel breaks down, start the provider backbone bridging VLAN in the described protection group, send described business;
Described receiving equipment is used to receive the business that described transmitting apparatus sends.
8, operator backbone transmission service protection system according to claim 7 is characterized in that described transmitting apparatus comprises:
Search module, be used for searching the protection group that has at least one a provider backbone bridging transmission engineering tunnel and a provider backbone bridging VLAN with described business accordingly according to the business that receives;
Detection module, whether the provider backbone bridging transmission engineering tunnel that is used to detect in the described protection group breaks down;
Protection module is used for breaking down when described provider backbone bridging transmission engineering tunnel, then starts the provider backbone bridging VLAN in the described protection group, sends described business.
9, operator backbone transmission service protection system according to claim 8 is characterized in that described transmitting apparatus also comprises:
Identification module is used to discern the business that receives from access device.
10, the merchant of battalion backbone transmission service protection system according to claim 8 is characterized in that described protection module specifically comprises:
Start unit is used for breaking down when described provider backbone bridging transmission engineering tunnel, then starts the provider backbone bridging VLAN in the described protection group;
Transmitting element is used for sending described business by described provider backbone bridging VLAN.
CN2008100083530A 2008-02-26 2008-02-26 Method, device and system for protecting operator backbone transmission service Expired - Fee Related CN101521614B (en)

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CN103365411A (en) * 2012-03-27 2013-10-23 索尼公司 Information input apparatus, information input method, and computer program
CN103716220A (en) * 2012-09-28 2014-04-09 杭州华三通信技术有限公司 Data transmission method and device
WO2016041319A1 (en) * 2014-09-18 2016-03-24 中兴通讯股份有限公司 Method and system of automatically modifying protection group identifier
CN111343645A (en) * 2018-12-19 2020-06-26 中国电信股份有限公司 Method and system for service quality assurance

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US6766482B1 (en) * 2001-10-31 2004-07-20 Extreme Networks Ethernet automatic protection switching
CN1291565C (en) * 2002-06-28 2006-12-20 成都卫士通信息产业股份有限公司 Technology of establishing safe multicasting tunnel with IP layer-based special virtual network
CN101127724B (en) * 2007-10-12 2012-04-18 杭州华三通信技术有限公司 Multicast system, device and method based on 802.1ah protocol in MAN Ethernet network

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103365411A (en) * 2012-03-27 2013-10-23 索尼公司 Information input apparatus, information input method, and computer program
CN103365411B (en) * 2012-03-27 2017-09-05 索尼公司 Information input equipment, data inputting method
CN103716220A (en) * 2012-09-28 2014-04-09 杭州华三通信技术有限公司 Data transmission method and device
CN103716220B (en) * 2012-09-28 2017-08-22 新华三技术有限公司 A kind of data transmission method and its device
WO2016041319A1 (en) * 2014-09-18 2016-03-24 中兴通讯股份有限公司 Method and system of automatically modifying protection group identifier
CN105490828A (en) * 2014-09-18 2016-04-13 中兴通讯股份有限公司 Method and system for automatically modifying protection group identification (ID)
CN105490828B (en) * 2014-09-18 2019-09-13 南京中兴新软件有限责任公司 The method and system of automatic modification protection group mark
CN111343645A (en) * 2018-12-19 2020-06-26 中国电信股份有限公司 Method and system for service quality assurance
CN111343645B (en) * 2018-12-19 2023-03-24 中国电信股份有限公司 Method and system for service quality assurance

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