CN101505237B - Network quality determination method, apparatus and communication system - Google Patents
Network quality determination method, apparatus and communication system Download PDFInfo
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- CN101505237B CN101505237B CN2009101187777A CN200910118777A CN101505237B CN 101505237 B CN101505237 B CN 101505237B CN 2009101187777 A CN2009101187777 A CN 2009101187777A CN 200910118777 A CN200910118777 A CN 200910118777A CN 101505237 B CN101505237 B CN 101505237B
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Abstract
The invention relates to the technical field of communication, and discloses a network quality determination method, a device and a communication system, wherein the network quality determination method comprises the following steps: acquiring original data; processing the original data to obtain index data; and performing operation through a pre-selected piecewise function and index data to obtain the highest level index evaluation score. By using the technical proposal provided by the embodiment of the invention, a parameter without a unit dimension can be used to weigh the network quality.
Description
Technical field
The present invention relates to communication technical field, be specifically related to network quality and confirm method, device and communication system.
Background technology
Along with the user to the demand of network and require increasingly high; Network technology is develop rapidly thereupon also, and at present, network has related to the various aspects of people's work, life; When people's work more and more be unable to do without network with life, also increasingly high to the requirement of network.Therefore how to confirm network quality, thereby network service quality is assessed a very important job when becoming networking, upgrading or dilatation.
Following is the technical scheme that example is introduced existing a kind of definite network quality with the broadband network; Broadband network comprises broadband access network; Internet protocol (IP:Internet Protocol) metropolitan area network and IP backbone; Nowadays broadband network is popularized huge numbers of families, and broadband network also develops into multiple services end-to-end bearer networks such as voice, video, value-added service from single high-speed internet access service.
But present broadband network all is opaque as far as professional and network, and a lot of operation systems are carried on broadband network.Be that network level is many on the one hand, double layer network is in large scale, and the three-layer network route is complicated, and professional unclear through which aspect, O&M department can't see the user and sets up professional passage, and breaking down is difficult to investigation.Each operation system all is to realize through unified bearer network on the other hand, and various concrete types of service in the network traffics " are mixed and run ", is difficult to distinguish, and also is difficult to planning.At present the service quality of broadband network is weighed main through three performance index: time-delay, shake and packet loss, these three performance index have different unit dimensions.
The inventor finds in to the research of prior art: because the unit dimension of time-delay, these three performance index of shake and packet loss is different; And three performance index are different to the influence of different business, therefore use these three performance index can not correctly weigh the network quality under the different business.
Summary of the invention
The embodiment of the invention provides network quality to confirm method, device and communication system, and the technical scheme of using the embodiment of the invention to provide can use the parameter of a no unit dimension that network quality is weighed.
The embodiment of the invention provides a kind of network quality to confirm method, comprising: gather initial data, said initial data comprises: any one in network reliability data and network resource data, the network performance data or combination in any; Said initial data is handled, obtained achievement data; Piecewise function and said achievement data through choosing in advance carry out computing acquisition highest level index evaluation mark; Saidly carry out computing through the piecewise function chosen in advance and said achievement data and obtain highest level index evaluation mark and comprise: use of the input of said achievement data, calculate the index evaluation mark of lowest hierarchical level as piecewise function; Begin from the index evaluation mark of said lowest hierarchical level, the index evaluation mark of same level is carried out the index evaluation mark that the weighted average computing obtains a high level, until obtaining said highest level index evaluation mark.
The embodiment of the invention also provides a kind of network quality to confirm device, comprising: collecting unit, be used to gather initial data, and said initial data comprises: any one in network reliability data and network resource data, the network performance data or combination in any; Processing unit is used for the initial data of said collecting unit collection is handled, and obtains achievement data; Arithmetic element; Be used for carrying out computing and obtain highest level index evaluation mark through the achievement data that the piecewise function chosen in advance and said processing unit processes obtain; Said arithmetic element comprises: first computing unit; Be used to use the input of achievement data that said processing unit processes obtains, calculate the index evaluation mark of lowest hierarchical level as said piecewise function; Second computing unit; The index evaluation mark of the said lowest hierarchical level that is used for calculating from said first computing unit begins; Index evaluation mark to same level carries out the index evaluation mark that the weighted average computing obtains a high level, until obtaining said highest level index evaluation mark.
The embodiment of the invention also provides a kind of communication system, comprises that the network quality that the embodiment of the invention provides confirms device.
Can find out from the above technical scheme that the embodiment of the invention provides; Because the embodiment of the invention can be handled the initial data of gathering; And then obtain a nondimensional highest level index evaluation mark network quality is assessed; And then can use this highest level index evaluation mark that network quality is weighed, and make the attendant only confirm network quality according to highest level index evaluation mark, made things convenient for assessment to network quality.Provide technical scheme can assess after networking or the dilatation improvement effect through the embodiment of the invention to network service quality; Also can before professional dilatation or new business granting, carry out Pre-Evaluation, avoid blindly commencing business network service capabilities.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 confirms the flow chart of method embodiment for network quality in the embodiment of the invention;
Fig. 2 is the function sketch map of piecewise function embodiment one in the embodiment of the invention;
Fig. 3 is the function sketch map of piecewise function embodiment two in the embodiment of the invention;
Fig. 4 confirms the structure chart of device embodiment for network quality in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The network quality that introducing the embodiment of the invention earlier provides is confirmed method, and Fig. 1 has described the flow process that network quality is confirmed method embodiment, comprising:
101, gather initial data;
Specifically can from the Monitoring Data of network management system, extract initial data, the extracting data initial data that also can report from network probe; The extracting data initial data that can certainly be simultaneously reports from the Monitoring Data and the network probe of network management system.Certainly, this only is the mode of the collection initial data that provides of the embodiment of the invention, is not to limit initial data only can pass through the aforementioned manner collection.
The initial data of embodiment of the invention collection can comprise: any one in network reliability data and the data such as network resource data, network performance data or combination in any;
Wherein, network resource data can comprise: machine utilization value when busy, trunk bandwidth, physical port use amount, peak value any one or the combination in any in the data such as relaying number that exceed standard when busy;
The network reliability data can comprise: network failure total time, the secondary sum of network failure, network failure secondary densities (NPR); Equipment availability; The relaying utilance; Relaying physical resource utilance, machine utilization compliance rate when busy, any one when busy in the data such as relaying utilance compliance rate or combination in any;
Network performance data can comprise: online time delay, shake, packet loss compliance rate; Web TV (IPTV:Internet Protocol Television) time delay, shake, packet loss compliance rate; The networking telephone (VOIP:Voice over Internet Protocol) time delay, shake, packet loss compliance rate; Big customer's Virtual Private Network (VPN:Virtual Private Network) special line time delay, shake, packet loss compliance rate; Asymmetrical Digital Subscriber Line (the ADSL:Asymmetric Digital Subscriber Line) user that goes offline unusually leads any one in the data such as ADSL user port speed compliance rate or combination in any.
Certainly, for As soon as possible Promising Policy user's needs, the initial data of collection can also comprise that the Internet user experiences, IPTV user experience, the arbitrary or combination in any in the VOIP user experience.Wherein, the Internet user experiences and can comprise: any one in the data such as name server (DNS:Domain Name Server) parsing time, transmission control protocol (the TCP:Transport Control Protocol) company's of building time, HTTP (HTTP:Hyper Text Transfer Protocol) first packet time delay, HTTP download time delay or combination in any.The IPTV user experience can comprise: any one in Web TV media delivery index (IPTV-MDI:IPTV Media Deliver Index), channel switching time, the average suggestion evaluation of the video branch data such as (V-MOS:Video Mean Opinion Score) or combination in any.The VOIP user experience can comprise average suggestion evaluation branch (MOS:Mean Opinion Score).
102, initial data is handled, obtained achievement data;
Because the initial data that collects maybe be many, therefore need handle initial data, the embodiment of the invention provides following several kinds of processing modes:
1) averages; A plurality of similar initial data to collecting is averaged, with the mean value that obtains as achievement data.
2) ask ratio; Use initial data divided by relevant total amount, with its quotient or ratio as achievement data.Particularly, can adopt this kind mode for initial data such as network failure secondary densities, network availability factor, physical port utilances.
3) ask compliance rate; Directly,, draw compliance rate according to the ratio of sample number that exceed standard, as achievement data with total sample number according to the relevant up to standard or standard value that exceeds standard with the mean value of initial data or initial data.When asking compliance rate, must define earlier that value up to standard/value exceeds standard.Machine utilization degree compliance rate when wherein, busy, relaying takies initial data such as compliance rate and can average earlier and calculate compliance rate again when busy; Initial data such as the service delay of relaying availability factor, network performance class, shake, packet loss compliance rate can be directly with initial data and the value that exceeds standard according to asking compliance rate.
103, carry out computing acquisition highest level index evaluation mark through piecewise function and the achievement data of choosing in advance.
This step specifically can be carried out with reference to following mode: the service index data calculate the index evaluation mark of lowest hierarchical level as the input of piecewise function; Begin from the index evaluation mark of lowest hierarchical level, the index evaluation mark of same level is carried out the index evaluation mark that the weighted average computing obtains a high level, until obtaining highest level index evaluation mark.
Particularly, because network has the various network layer, the network layer that different service stresses maybe be different, therefore can confirm as required that the index evaluation mark of which level is a highest level index evaluation mark.
From the above; Present embodiment can be handled the initial data of gathering; And then obtain a nondimensional highest level index evaluation mark network quality is assessed; And then can use this highest level index evaluation mark that network quality is weighed, and make the attendant only confirm network quality according to highest level index evaluation mark, made things convenient for assessment to network quality.The network quality that provides through the embodiment of the invention confirms that method can assess after networking or the dilatation improvement effect to network service quality; Also can before professional dilatation or new business granting, carry out Pre-Evaluation, avoid blindly commencing business network service capabilities.
Further; The network quality that the embodiment of the invention provides is confirmed method, can also preserve the index evaluation mark of initial data and each level, thereby makes the index evaluation mark of each level have back track function; Thereby when analyzing certain index evaluation mark; Can date back to initial data layer by layer, thereby can confirm it specifically is that those data go wrong, can locate more accurately and deal with problems.
In the embodiment of the invention, piecewise function can be through directly confirming mode or getting modeling pattern ready and choose; Wherein, confirm that directly mode is suitable for the strong indexs of objectivity such as network reliability index and Internet resources index, for example can adopt linear function.Get modeling pattern ready and be suitable for the strong indexs of subjectivity such as user experience index; Can set some sampled data points; Please sample population be given a mark by data point; Obtain a series of " data-mark " corresponding points, confirm the respective function model according to getting ready then, the index evaluation mark that calculates is like this experienced near the crowd is subjective more.In a word, no matter take which kind of mode, the variation tendency that can guarantee the index evaluation mark is correct.
Suppose that in piecewise function achievement data is input x, the index evaluation mark of lowest hierarchical level is output y, and the piecewise function that the embodiment of the invention provides can be based on following three kinds of Mathematical Modelings:
y＝ax+b
y＝ax
2+bx+c
y＝ax
-1+b
Achievement data to obtain from initial data is that " the HTTP first packet arrives time delay " is example, and the setting time delay all is 100 minutes smaller or equal to the score of 100ms, and time delay is 0 minute greater than 200ms.
Suppose that the index evaluation mark to " the HTTP first packet arrives time delay " descends along with time delay increases linearity between 100ms to 200ms, select for use Mathematical Modeling y=ax+b as piecewise function embodiment one of the present invention.Promptly can obtain following equation group:
100＝100a+b
0＝200a+b
Calculating can obtain a=-1, b=200;
Thereby confirm that piecewise function is y=-x+200, (100≤x≤200).
Thereby the function sketch map that can confirm piecewise function embodiment one is as shown in Figure 2; Suppose that it is 168ms that certain statistics network HTTP first packet arrives time delay; According to above-mentioned piecewise function and Fig. 2, can draw HTTP first packet arrival time delay index evaluation mark is 32 minutes so.
Suppose that evaluation score is violent decline when time-delay begins to increase from 100ms, and along with the increase of delaying time, evaluation score descends and tends towards stability, and can between 100ms to 200ms, select Mathematical Modeling y=ax for use
-1The conduct of+b piecewise function embodiment two of the present invention.Promptly can obtain following equation group:
Calculating can obtain a=20000, b=-100;
Thereby confirm that piecewise function is y=20000 * x
-1-100, (100≤x≤200);
Thereby the function sketch map that can confirm piecewise function embodiment two is as shown in Figure 3; Suppose that it is 168 milliseconds (ms) that certain statistics network HTTP first packet arrives time delay; According to above-mentioned piecewise function and Fig. 3, can draw HTTP first packet arrival time delay index evaluation mark is 19 minutes so.
The value of coefficient a and b can business in the embodiment of the invention, condition such as client's needs adjusts, thereby make the highest level index evaluation mark that obtains at last can more satisfy professional and client's needs; And, can make amendment during new business in exploitation, make network quality confirm that method can be towards this new business coefficient, can the immediate assessment network service quality after new business is provided.
In an embodiment provided by the invention, highest level index evaluation mark can be obtained by network reliability index mark, Internet resources index mark and the computing of network performance index mark weighted average.
Wherein, network reliability index mark can obtain through network failure secondary densities, network availability factor and relaying availability factor; A kind of network reliability index definition that the embodiment of the invention provides is as shown in table 1, and wherein w representes the weight that the embodiment of the invention provides.
Table 1, network reliability index definition
Internet resources index mark can through the physical port resource utilization, when busy equipment meet compliance rate and when busy relaying take compliance rate and obtain; A kind of Internet resources index definition that the embodiment of the invention provides is as shown in table 2, and wherein w representes the weight that the embodiment of the invention provides.
Table 2, Internet resources index definition
In the table 2; Machine utilization compliance rate when busy; Comprise access, converge, the degree of loading initial data of core layer, business platform, insert, converge, the degree of loading initial data of core layer, business platform comprises: each network equipment central processing unit (CPU) occupancy/memory usage; Wherein, For broadband route access server (BRAS:Broad Bind Routing Access Server), then need increase peer-peer protocol (PPPOE:Point-to-Point Protocol over Ethernet) the user concurrent rate data (coincidence is real-time PPPOE concurrent user number and the ratio that designs maximum PPPOE concurrent user number) that statistics is carried on Ethernet.
The network performance index mark can be through online time delay, shake, packet loss compliance rate; IPTV time delay, shake, packet loss compliance rate; VOIP time delay, shake, packet loss compliance rate; Big customer VPN special line time delay, shake, packet loss compliance rate, the ADSL user that goes offline unusually leads, and ADSL user port speed compliance rate obtains; A kind of network performance index definition that the embodiment of the invention provides is as shown in table 3, and wherein w representes the weight that the embodiment of the invention provides.
Table 3, network performance index definition
In another embodiment provided by the invention, highest level index evaluation mark can be obtained by network reliability index mark, Internet resources index mark, network performance index mark and the computing of user experience index mark weighted average; Wherein, the definition of network reliability index, Internet resources index, network performance index is referring to table 1-3, and the user experience index definition that the embodiment of the invention provides is as shown in table 4, and wherein w representes the weight that the embodiment of the invention provides.
Table 4, user experience index definition
Though table 1 has all provided the weight that the embodiment of the invention provides to 4, it is understandable that table 1 only is a kind of implementation that the embodiment of the invention provides to 4 weights that provide, these weights can be confirmed according to factors such as different service, environment, networks.Each initial data and index evaluation mark are provided with weight; Can make amendment to weight according to different service and client's needs; Thereby can do the measurement that difference stresses, make the highest level index evaluation mark that obtains more to satisfy professional needs, also can satisfy client's needs; And, can make amendment during new business in exploitation, make network quality confirm that method can be towards this new business weight, can the immediate assessment network service quality after new business is provided.
The network quality that Fig. 4 has described the embodiment of the invention to be provided is confirmed the structure of device embodiment, comprising:
Collecting unit 401 is used to gather initial data;
Wherein, arithmetic element 403 specifically can comprise: first computing unit 4031, the achievement data that is used to use processing unit 402 to handle to obtain calculate the index evaluation mark of lowest hierarchical level as the input of piecewise function; Second computing unit 4032; The index evaluation mark of the lowest hierarchical level that is used for calculating since first computing unit 4031; Index evaluation mark to same level carries out the index evaluation mark that the weighted average computing obtains a high level, until obtaining highest level index evaluation mark.
From the above; Present embodiment can be handled the initial data of gathering; And then obtain a nondimensional highest level index evaluation mark network quality is assessed; And then can use this highest level index evaluation mark that network quality is weighed, and make the attendant only confirm network quality according to highest level index evaluation mark, made things convenient for assessment to network quality.The network quality that provides through the embodiment of the invention confirms that device can assess after networking or the dilatation improvement effect to network service quality; Also can before professional dilatation or new business granting, carry out Pre-Evaluation, avoid blindly commencing business network service capabilities.
As shown in Figure 4; The network quality that the embodiment of the invention provides confirms that device embodiment can also comprise preservation unit 404, is used to preserve first computing unit 4031 and calculates the index evaluation mark of lowest hierarchical level and the index evaluation mark of the high level that second computing unit 4032 calculates.
Further, the network quality that provides of the embodiment of the invention confirms that the included preservation unit 404 of device embodiment can also be used to preserve the initial data that collecting unit 401 is gathered; Wherein preserve unit 404 and can directly obtain the initial data that collecting unit 401 is gathered from collecting unit 401; Because the initial data that collecting unit 401 is gathered all can send to processing unit 402 and handle, therefore preserve unit 404 and also can obtain the initial data that collecting unit 401 is gathered from processing unit 402.
Through preserving the unit index evaluation mark of initial data and each level is preserved; Make the index evaluation mark of each level have back track function; Thereby when analyzing certain index evaluation mark; Can date back to initial data layer by layer, thereby can confirm it specifically is that those data go wrong, can locate more accurately and deal with problems.
The embodiment of the invention also provides communication system, and this communication system comprises that the network quality that the embodiment of the invention provides confirms device.
Wherein, Network quality confirms that the collecting unit that device provides can be network probe and the webmaster that is distributed in the communication network in the communication system that the embodiment of the invention provides; Processing unit and arithmetic element etc. can be arranged in same the computer, also can be arranged on the different computers.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
More than the network quality that the embodiment of the invention provided is confirmed that method, device and communication system carried out detailed introduction, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a network quality is confirmed method, it is characterized in that, comprising:
Gather initial data, said initial data comprises: any one in network reliability data and network resource data, the network performance data or combination in any;
Said initial data is handled, obtained achievement data;
Piecewise function and said achievement data through choosing in advance carry out computing acquisition highest level index evaluation mark; Saidly carry out computing through the piecewise function chosen in advance and said achievement data and obtain highest level index evaluation mark and comprise: use of the input of said achievement data, calculate the index evaluation mark of lowest hierarchical level as piecewise function; Begin from the index evaluation mark of said lowest hierarchical level, the index evaluation mark of same level is carried out the index evaluation mark that the weighted average computing obtains a high level, until obtaining said highest level index evaluation mark.
2. network quality as claimed in claim 1 is confirmed method, it is characterized in that, said method also comprises:
Preserve the index evaluation mark of said lowest hierarchical level and the index evaluation mark of a said high level.
3. network quality as claimed in claim 1 is confirmed method, it is characterized in that, said highest level index evaluation mark is obtained by network reliability index mark, Internet resources index mark and the computing of network performance index mark weighted average; Or
Said highest level index evaluation mark is obtained by network reliability index mark, Internet resources index mark, network performance index mark and the computing of user experience index mark weighted average.
4. network quality as claimed in claim 1 is confirmed method, it is characterized in that, further comprises after the collection initial data:
Preserve said initial data.
5. confirm method like the arbitrary described network quality of claim 1 to 4, it is characterized in that said collection initial data comprises:
The said initial data of extracting data of from the Monitoring Data of network management system, extracting said initial data and/or reporting from network probe.
6. confirm method like the arbitrary described network quality of claim 1 to 4, it is characterized in that said said initial data is handled comprises:
To the processing of averaging of said initial data; Or
Said initial data is asked rate process; Or
Ask compliance rate to handle to said initial data.
7. confirm method like the arbitrary described network quality of claim 1 to 4, it is characterized in that said piecewise function is chosen through directly confirming mode.
8. a network quality is confirmed device, it is characterized in that, comprising:
Collecting unit is used to gather initial data, and said initial data comprises: any one in network reliability data and network resource data, the network performance data or combination in any;
Processing unit is used for the initial data of said collecting unit collection is handled, and obtains achievement data;
Arithmetic element; Be used for carrying out computing and obtain highest level index evaluation mark through the achievement data that the piecewise function chosen in advance and said processing unit processes obtain; Said arithmetic element comprises: first computing unit; Be used to use the input of achievement data that said processing unit processes obtains, calculate the index evaluation mark of lowest hierarchical level as said piecewise function; Second computing unit; The index evaluation mark of the said lowest hierarchical level that is used for calculating from said first computing unit begins; Index evaluation mark to same level carries out the index evaluation mark that the weighted average computing obtains a high level, until obtaining said highest level index evaluation mark.
9. network quality as claimed in claim 8 is confirmed device, it is characterized in that, also comprises:
Preserve the unit, be used to preserve the index evaluation mark of said lowest hierarchical level and the index evaluation mark of a said high level.
10. network quality as claimed in claim 9 is confirmed device, it is characterized in that, said preservation unit also is used to preserve the initial data that said collecting unit is gathered.
11. a communication system is characterized in that, comprises like the arbitrary described network quality of claim 8 to 10 confirming device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102111397A (en) * | 2009-12-29 | 2011-06-29 | 中兴通讯股份有限公司 | Transmission protection method for service quality in IP network and device adopting same |
| CN102026262B (en) * | 2010-12-07 | 2014-11-05 | 中兴通讯股份有限公司 | User experience assessment method and server |
| CN102546220B (en) * | 2010-12-31 | 2014-09-03 | 中国移动通信集团福建有限公司 | Key quality indicator (KQI) composition method based on service characteristics |
| CN102098719A (en) * | 2011-01-11 | 2011-06-15 | 大唐移动通信设备有限公司 | Method and device for determining network quality |
| CN102347860B (en) * | 2011-10-18 | 2014-12-24 | 北京星网锐捷网络技术有限公司 | Method and device for evaluating quality of network application |
| CN104105121A (en) * | 2013-04-11 | 2014-10-15 | 中国移动通信集团浙江有限公司 | Network quality segmented quantification evaluation method and system |
| CN103414958A (en) * | 2013-08-21 | 2013-11-27 | 中广有线信息网络有限公司 | Cable television network broad band user experience evaluation system |
| CN104184623B (en) * | 2014-09-10 | 2018-06-22 | 深圳市优网科技有限公司 | A kind of method and device of singal reporting code generation |
| CN106934721A (en) * | 2015-12-28 | 2017-07-07 | 镇江高科信息科技有限公司 | The method and device that a kind of interpersonal information interchange is generated with transmission index |
| CN107493519A (en) * | 2016-06-13 | 2017-12-19 | 中兴通讯股份有限公司 | A kind of network quality appraisal procedure and device based on user video experience |
| CN109347683B (en) * | 2018-11-20 | 2022-07-12 | 中国电信集团工会上海市委员会 | Method for analyzing end-to-end service availability of transmission optical transmission network |
| CN110149251A (en) * | 2019-07-02 | 2019-08-20 | 福建广电网络集团股份有限公司 | A kind of access net quality evaluation system |
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