CN101360312A - Optimizing method and apparatus of mobile communication network - Google Patents
Optimizing method and apparatus of mobile communication network Download PDFInfo
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Abstract
The invention discloses an optimization method for a mobile communication network and the device thereof. The method includes: step 1, collecting network control or management process messages as well as radio measurement process messages and power control messages; step 2, analyzing the collected messages, and judging the network status according to the analyzed result, so as to correspondingly optimize the network. The device consists of a first message collection module, a message storage module, a message process module and an application module. The network optimizing efficiency can be improved through the optimization method of the invention.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of optimization method and device of mobile communications network.
Background technology
Mobile communications network needs the stages such as the network planning, engineering construction, the network optimization from first stage of construction to final maturation, and the network optimization is one of them important link.The network optimization specifically is that the network that has moved is carried out data acquisition and analysis, find out the reason that influences network quality, by Frequency Design, base station parameter, network configuration etc. are adjusted, make network reach optimal operational condition then, make Internet resources obtain best utilance.By the growth trend of all right awareness network of the network optimization, for the follow-up dilatation of network provides effective reference frame.
Existing network optimized approach mainly comprises following several:
1. by drive test (Driving Test the is called for short DT) network optimization.Specifically be road measuring device in the mobile communications network coverage, obtain the network coverage on the way and quality of service situation in the mode that reality moves, then test zone is carried out after the analysis of network related data network being optimized.Driver test system is usually by testing mobile phone, global positioning system (Global Positioning System, abbreviation GPS), sweep generator and notebook computer are formed, notebook computer is equipped with drive test software, gathers and analyze the information from testing mobile phone, GPS and sweep generator.
2. carry out the network optimization by operation maintenance center's (Operations and Maintenance Center is called for short OMC).OMC is an entity of being responsible for Operation and Maintenance among the mobile network, can be divided into the operation maintenance center (OMC-R) of wireless subsystem and the operation maintenance center (OMC-S) of switching subsystem according to implementation.Be to write down the network service process internally on the OMC principle by network element device, and output network daily record or all kinds of statistical counter (counter) confession analysis.
3. carry out the network optimization by the signaling protocol analysis.The signaling protocol analysis is the important means of communication network being carried out operation maintenance, modes such as the high-ohmic cross-connection of signaling protocol analysis by not influencing the network operation, Port Mirroring, energy distribution are gathered all kinds of signalings and protocol data, carry out the signaling protocol decoding, synthetic call detail record (calling detail records, be called for short CDR), reproduce the business continuing overall process, carry out network and professional all kinds of indicator-specific statistics, thereby make network maintenance staff's grasp and phase-split network and service operation situation.Mainly being deployed in core network and the above network portion of A interface at present, mainly is to be used for business process analysis, malfunction elimination, to interconnect and analyze etc.
But all there is the problem of network optimization operating efficiency difference in above-mentioned existing network optimization technology.
Summary of the invention
The objective of the invention is defective, a kind of optimization method and device of mobile communications network are provided, thereby can improve network optimization operating efficiency at prior art.
In order to achieve the above object, a kind of optimization method of mobile communications network comprises:
Step 1, the control of collection network or management process class information and wireless measurement process message and power control information information;
A kind of optimization means of mobile communications network comprises:
First information acquisition module is used for control or management process class information and the wireless measurement process message and the power control information information of collection network;
Information storage module is used to store the information that described first information acquisition module is gathered;
Message processing module is used for described information storage module canned data is carried out analyzing and processing;
Application module, the analysis processing result that is used for obtaining according to described message processing module is optimized network.
The optimization method of mobile communications network provided by the invention and device, not only the control of collection network or management process class information are analyzed, and gather wireless measurement process message and power control information information is analyzed, can improve network optimization operating efficiency.
Description of drawings
Fig. 1 is the flow chart of the optimization method embodiment 1 of mobile communications network of the present invention;
Fig. 2 is the structure chart of the optimization means embodiment 1 of mobile communications network of the present invention;
Fig. 3 is another structure chart of the optimization means embodiment 2 of mobile communications network of the present invention;
Fig. 4 is the another structure chart of the optimization means embodiment 2 of mobile communications network of the present invention;
Fig. 5 is the structure chart of the optimization means embodiment 3 of mobile communications network of the present invention;
Fig. 6 is another structure chart of the optimization means embodiment 3 of mobile communications network of the present invention;
Fig. 7 is the another structure chart of the optimization means embodiment 3 of mobile communications network of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The invention provides a kind of optimization method of mobile communications network, Fig. 1 is the flow chart of the inventive method embodiment 1, comprising:
Step 1, the control of collection network or management process class message and wireless measurement process message and power control information information;
No matter be 2G, 2.5G or 3G network, the interface signaling message of access network all comprises two classes: a class is control and management process class message, sets up process and direct-sending message processes such as deletion such as sub-district foundation deletion, channel foundation deletion, Radio Link; Another kind of is wireless measurement process message and power control information, comprises the uplink and downlink wireless parameter.Traditional signaling protocol analysis side overweights the reduction of signaling procedure, mainly is deployed in the core network part at present, and main analysis and Control and management process class message are not then done analysis for wireless measurement process message and power control information.The signaling protocol analysis that the present invention takes has increased collection and analysis to wireless measurement process message and power control information on the traditional signaling message fundamentals of analyses of processes, thereby the uplink and downlink wireless parameter of all users in the monitoring range is analyzed.The Abis interface of Iub interface, 2G network and 2.5G network that can be by 3G network, obtain wireless measurement process message and power control information, on the Abis interface of Iub interface, 2.5G network and the 2G network of 3G network, except that transmitting conventional communication signaling reciprocal process, the base station also can report to RNC or BSC with the wireless measurement parameter of the uplink and downlink link of air interface by measurement report message (such as measurement Report, Dedicated Measurement Report and Common MeasurementReport).For 3G network, analyzable wireless measurement process message and power control information comprise: the receiving code power (CPICH RSCP) of the intensity in the time of can embodying coverage condition and characterization signal arrival mobile phone; Can react the chip energy/noise power (CPICH Ec/N0) of signal to noise ratio situation, embodiment covering quality; Path loss (Pathloss); Signal to noise ratio (SIR); The transmitted power of a certain spreading factor on a certain carrier wave on a certain given scrambler (Transmitted Code Power).For the 2G network, analyzable wireless measurement process message and power control information comprise: uplink and downlink signals intensity (rxlev); Uplink and downlink signals quality (rxqual); Up-downgoing path loss; Transmission power of mobile station; Timing Advance (TA).
For the control and the management process class message that obtain, carry out mainly that process message cooperates and message parameter (Information Element) analysiss, various types of messages statistical analysis, process KPI (process initiation number of times, process number of success, procedure failure number of times, process time delay, process success rate, procedure failure divide former number of dimensions etc.) in the analysis of each dimension (time, sub-district, type of service etc.).For the wireless measurement process message and the power control information that obtain, mainly carry out wireless parameter statistical analysis and wireless measurement process message and cooperate and the wireless parameter careful analysis, thereby the uplink and downlink wireless parameter of all users in the monitoring range is analyzed.And, can also be on the basis of above-mentioned analysis control or management process class message and wireless measurement process message and power control information be carried out association analysis, in the signalling interactive process such as a voice call, can regularly transmit measurement report message (Dedicated Measurement Report) simultaneously, can include wireless parameters such as transmitting power, path loss in these message, can be in analysis and Control or management process class message, these wireless measurement process message and power control information are pressed the time point comparative analysis, thereby analyze the relation between them.
The embodiment 1 of the inventive method gathers also control or management process class message and the wireless measurement process message and the power control information information of phase-split network, thereby the uplink and downlink wireless parameter to all users in the monitoring range is analyzed, and can improve network optimization operating efficiency.
On the basis of the foregoing description 1, the present invention can also comprise the step that obtains drive test data information and obtain the OMC data message by OMC by the drive test mode before step 2.Can carry out Conjoint Analysis to the drive test data, OMC data and the control that obtain or management process class message and wireless measurement process message and power control information then, promptly realize the Conjoint Analysis technology of OMC analysis, signalling analysis and DT analysis.Just combine also that OMC analyzes that the deployment have is simple, cost is low, careful analysis and obtain network overall operation situation fast among a small circle, DT analyzes user's perception and the actual environment test have, and the more careful analysis ability that has of signaling protocol analysis.
Wherein the signaling protocol analysis can also be carried out synchronization association with DT, in traffic signaling reciprocal process, the layer three L3 message of the direct-sending message of 3G and 2G all are to be transparent to mobile phone terminal through air interface, for example set up (SETUP), connection procedure message sequences such as (CALLPROCEDING/CONNECT), can be undertaken alternately by air interface and mobile phone terminal for the conversation of voice call process.The signalling analysis means can be from these message sequence processes of network collection, DT then can write down these message sequence processes and descending wireless measured data from mobile phone terminal, the message sequence of two data sources of same process can be associated together analysis by Subscriber Number, time, these three key messages of identical message, can find the problem of message cooperation aspect by this comparison, also the signaling of down-run survey data in the DT data and network side can be carried out association analysis, realize the end-to-end association analysis of drive test and network.
In addition, because the 2G Abis interface belongs to the interface of nonstandardized technique, each equipment producer can realize by agreement separately when realizing.The Iub interface agreement of 3G belongs to 3GPP organizational standard interface, and each equipment producer is observing some expansions of do on the basis of this standard, therefore need to increase the analysis to the privately owned interface protocol of each instrument factory man on the basis of universal protocol analysis.
By the embodiment 2 of the inventive method,, realize comprehensively macroscopic view, micro-analysis, thereby can accurately locate the wireless network fault by the Conjoint Analysis technology that OMC analysis, signalling analysis and DT analyze.
The present invention also provides a kind of optimization means of mobile communications network, and as shown in Figure 2, the embodiment 1 for apparatus of the present invention comprises: first information acquisition module 1, information storage module 2, message processing module 3 and application module 4.
First information acquisition module 1 is used for control or management process class message and the wireless measurement process message and the power control information information of collection network, for 3G network, these information can obtain by Iub interface, and for the 2G/2.5 network, these information can obtain by Abis interface.The interface signaling message of access network all comprises two classes: a class is control and management process class message, sets up process and direct-sending message processes such as deletion such as sub-district foundation deletion, channel foundation deletion, Radio Link; Another kind of is wireless measurement process message and power control information, comprises the uplink and downlink wireless parameter.A traditional signaling protocol analysis acquisition controlling and management process class message are not then done collection for wireless measurement process message and power control information, and the present invention has increased the collection to wireless measurement process message and power control information.For 3G network, wireless measurement process message and power control information comprise: the receiving code power (CPICH RSCP) of the intensity in the time of can embodying coverage condition and characterization signal arrival mobile phone; Can react the chip energy/noise power (CPICH Ec/N0) of signal to noise ratio situation, embodiment covering quality; Path loss (Pathloss); Signal to noise ratio (SIR); The transmitted power of a certain spreading factor on a certain carrier wave on a certain given scrambler (Transmitted Code Power).For the 2G network, wireless measurement process message and power control information comprise: uplink and downlink signals intensity (rxlev); Uplink and downlink signals quality (rxqual); Up-downgoing path loss; Transmission power of mobile station; Timing Advance (TA).
The analysis processing result that application module 4 is used for obtaining according to described message processing module 3 is optimized network, for example in the 2G network, find by signalling analysis, BTS all receives exchange side descending " Disconnect " or " Release " message, owing to fail " Release " or " Release Complete " message of correct up correspondence, after about 5 seconds in the up ERRND message of Abis interface, the up Clear Request of inducing B SC message.The timer that at this moment application module 4 gives an order exchange side control " Release " and " Release Complete " was revised as 1 second by 30s, when exchange side is not also received " Release Complete " behind timer expiry, exchange side will be retransmitted this message, as also there not being response in 1 second, switch will send normal release Resource Commands " Clear command ", so, reduce the generation of call drop, and discharged resource at short notice, improved the degree of utilizing of resource.
As shown in Figure 3, the message processing module 3 among apparatus of the present invention embodiment 1 can specifically comprise first analysis module 31 and second analysis module 32, thereby has constituted the embodiment 2 of apparatus of the present invention.First analysis module 31 is used to analyze described control or management process class information, carry out mainly that process message cooperates and message parameter (Information Element) analysiss, various types of messages statistical analysis, process KPI (process initiation number of times, process number of success, procedure failure number of times, process time delay, process success rate, procedure failure divide former number of dimensions etc.) in the analysis of each dimension (time, sub-district, type of service etc.); Second analysis module 32 is used to analyze described wireless measurement process message and power control information information, mainly carry out wireless parameter statistical analysis (similar) and wireless measurement process message and cooperate and the wireless parameter careful analysis, thereby the uplink and downlink wireless parameter of all users in the monitoring range is analyzed with MR.As shown in Figure 4, and message processing module 3 can also comprise that the first Conjoint Analysis module, 33, the first Conjoint Analysis modules 33 are used for Conjoint Analysis control and management process class information and wireless measurement process and power control information information.In the signalling interactive process such as a voice call, can regularly transmit measurement report message (Dedicated Measurement Report) simultaneously, can include wireless parameters such as transmitting power, path loss in these message, can be in analysis and Control or management process class message, these wireless measurement process message and power control information are pressed the time point comparative analysis, thereby analyze the relation between them.
Embodiment 1 of apparatus of the present invention and control or management process class message and wireless measurement process message and the power control information information of embodiment 2 by first information acquisition module collection network, analyze these information by message processing module, thereby the uplink and downlink wireless parameter to all users in the monitoring range is analyzed, and can improve network optimization operating efficiency.
As shown in Figure 5, on the basis of embodiment 1, apparatus of the present invention can also comprise second information acquisition module 5, thereby have constituted the embodiment 3 of apparatus of the present invention.Second information acquisition module 5 is used to gather drive test data that obtains by the drive test mode and the OMC data that obtain by OMC.Can all analyze the drive test data, OMC data and the control that obtain or management process class message and wireless measurement process message and power control information then.
As shown in Figure 6, in apparatus of the present invention embodiment 3, data processing module can specifically comprise first analysis module 31, second analysis module 32, the first Conjoint Analysis module 33 and the second Conjoint Analysis module 34.Identical in the function of first analysis module 31, second analysis module 32 and the first Conjoint Analysis module 33 and the various embodiments described above wherein.The second Conjoint Analysis module 34 is used for Conjoint Analysis drive test data information, OMC data message, described control or management process class information and wireless measurement process message and power control information information, OMC analyzes that the deployment have is simple, cost is low, careful analysis and obtain network overall operation situation fast among a small circle thereby combine, DT analyzes user's perception and the actual environment test have, and the more careful analysis ability that has of signaling protocol analysis.Show as Fig. 7, data processing module can also comprise the synchronization association analysis module, and the synchronization association analysis module is used for synchronization association and analyzes described drive test data information, described control or management process class information and wireless measurement process message and power control information information.In traffic signaling reciprocal process, the layer three L3 message of the direct-sending message of 3G and 2G all are to be transparent to mobile phone terminal through air interface, for example set up (SETUP), connection procedure message sequences such as (CALL PROCEDING/CONNECT), can be undertaken alternately by air interface and mobile phone terminal for the conversation of voice call process.The signalling analysis means can be from these message sequence processes of network collection, DT then can write down these message sequence processes and descending wireless measured data from mobile phone terminal, the synchronization association analysis module can be associated together analysis with the message sequence of two data sources of same process by Subscriber Number, time, these three key messages of identical message, can find the problem of message cooperation aspect by this comparison, also the signaling of down-run survey data in the DT data and network side can be carried out association analysis, realize the end-to-end association analysis of drive test and network.
Among the embodiment 3 of apparatus of the present invention, drive test data that obtains by the drive test mode by the second information acquisition module collection and the OMC data that obtain by OMC, the second Conjoint Analysis module combines OMC analysis, signalling analysis with the DT analytical technology, realize comprehensively macroscopic view, micro-analysis, thereby can accurately locate the wireless network fault.
In addition, because the 2G Abis interface belongs to the interface of nonstandardized technique, each equipment producer can realize by agreement separately when realizing.The Iub interface agreement of 3G belongs to 3GPP organizational standard interface, some expansions of do on the basis of this standard are being observed by each equipment producer, therefore in the data processing module of above each embodiment, privately owned interface message analysis module can be comprised again, thereby analysis can be increased the privately owned interface protocol of each instrument factory man.
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.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. the optimization method of a mobile communications network wherein, comprising:
Step 1, the control of collection network or management process class information and wireless measurement process message and power control information information;
Step 2 is analyzed the information of gathering, and judges network condition, corresponding optimization network according to analysis result.
2. network optimized approach according to claim 1, wherein, for the 2G network, described step 1 is specially: by control or management process class information and the wireless measurement process message and the power control information information of A interface and Abis interface collection network.
3. network optimized approach according to claim 1, wherein, for the 2.5G network, described step 1 is specially: by control or management process class information and the wireless measurement process message and the power control information information of Gb Interface and Abis interface collection network.
4. network optimized approach according to claim 1, wherein, for 3G network, described step 1 is specially: by control or management process class information and the wireless measurement process message and the power control information information of Iu interface and Iub interface collection network.
5. according to claim 1 or 2 or 3 or 4 described network optimized approach, wherein, the information that described analysis obtains comprises: Conjoint Analysis control and management process class information and wireless measurement process and power control information information.
6. network optimized approach according to claim 1 wherein, also comprises before the described step 2: obtain drive test data information and obtain the OMC data message by OMC by the drive test mode.
7. network optimized approach according to claim 6, wherein, the information of described analysis collection comprises: the described drive test data information of Conjoint Analysis, described OMC data message, described control or management process class information and wireless measurement process message and power control information information.
8. according to claim 6 or 7 described network optimized approach, wherein, the information of described analysis collection comprises: synchronization association is analyzed described drive test data information, described control or management process class information and wireless measurement process message and power control information information.
9. network optimized approach according to claim 8, wherein, the information of described analysis collection also comprises: analyze privately owned interface protocol data message.
10. the optimization means of a mobile communications network wherein, comprising:
First information acquisition module is used for control or management process class information and the wireless measurement process message and the power control information information of collection network;
Information storage module is used to store the information that described first information acquisition module is gathered;
Message processing module is used for described information storage module canned data is carried out analyzing and processing;
Application module, the analysis processing result that is used for obtaining according to described message processing module is optimized network.
11. network optimization device according to claim 10, wherein, described message processing module comprises:
First analysis module is used to analyze described control or management process class information;
Second analysis module is used to analyze described wireless measurement process message and power control information information.
12. network optimization device according to claim 11, wherein, described message processing module also comprises:
The first Conjoint Analysis module is used for Conjoint Analysis control and management process class information and wireless measurement process and power control information information.
13. network optimization device according to claim 10 wherein, also comprises
Second information acquisition module is used to gather drive test data that obtains by the drive test mode and the OMC data that obtain by OMC;
Described information storage module also is used to store the information that described second information acquisition module is gathered.
14. network optimization device according to claim 13, wherein, described message processing module comprises:
First analysis module is used to analyze described control or management process class information;
Second analysis module is used to analyze described wireless measurement process message and power control information information.
The first Conjoint Analysis module is used for Conjoint Analysis control and management process class information and wireless measurement process and power control information information;
The second Conjoint Analysis module is used for Conjoint Analysis drive test data information, OMC data message, described control or management process class information and wireless measurement process message and power control information information.
15. network optimization device according to claim 14, wherein, described message processing module also comprises:
The synchronization association analysis module is used for synchronization association and analyzes described drive test data information, described control or management process class information and wireless measurement process message and power control information information.
16. according to claim 11 or 12 or 14 or 15 described network optimization devices, wherein, described message processing module also comprises: privately owned interface message analysis module is used to analyze privately owned interface protocol data message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102082614A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团广西有限公司 | Method and device for detecting quality of communication system based on sweep generator |
| CN102143507A (en) * | 2010-11-23 | 2011-08-03 | 北京中创信测科技股份有限公司 | Method and system for monitoring service quality, and analytical method and system therefor |
| CN102149103A (en) * | 2011-04-11 | 2011-08-10 | 北京铭润创展科技有限公司 | Network optimizing system and method |
| CN102821408A (en) * | 2012-08-16 | 2012-12-12 | 北京拓明科技有限公司 | A-port and Abis-port signaling data based high-speed railway field network optimizing method |
| CN103501502A (en) * | 2013-09-04 | 2014-01-08 | 工业和信息化部电信研究院 | Drive test method |
| CN103581953A (en) * | 2012-07-19 | 2014-02-12 | 珠海世纪鼎利通信科技股份有限公司 | Association method for wireless drive test data and signaling monitoring data |
| CN104254094A (en) * | 2013-06-28 | 2014-12-31 | 珠海世纪鼎利通信科技股份有限公司 | GSM (global system for mobile communications) frequency optimization method based on interference relation of same BCCH (broadcast control channel) sections |
| CN111182577A (en) * | 2020-01-03 | 2020-05-19 | 重庆邮电大学 | CDR synthesis monitoring system and method suitable for 5G road tester |
| CN112770346A (en) * | 2021-03-08 | 2021-05-07 | 中国人民解放军军事科学院战争研究院 | Base station data optimization method and device |
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| CN102082614B (en) * | 2009-11-30 | 2014-01-08 | 中国移动通信集团广西有限公司 | Method and device for detecting quality of communication system based on sweep generator |
| CN102082614A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团广西有限公司 | Method and device for detecting quality of communication system based on sweep generator |
| CN102143507B (en) * | 2010-11-23 | 2015-04-15 | 北京中创信测科技股份有限公司 | Method and system for monitoring service quality, and analytical method and system therefor |
| CN102143507A (en) * | 2010-11-23 | 2011-08-03 | 北京中创信测科技股份有限公司 | Method and system for monitoring service quality, and analytical method and system therefor |
| CN102149103A (en) * | 2011-04-11 | 2011-08-10 | 北京铭润创展科技有限公司 | Network optimizing system and method |
| CN102149103B (en) * | 2011-04-11 | 2013-12-18 | 北京铭润创展科技有限公司 | Network optimizing system and method |
| CN103581953B (en) * | 2012-07-19 | 2016-06-22 | 珠海世纪鼎利通信科技股份有限公司 | A kind of method of wireless drive test data and monitoring signaling data association |
| CN103581953A (en) * | 2012-07-19 | 2014-02-12 | 珠海世纪鼎利通信科技股份有限公司 | Association method for wireless drive test data and signaling monitoring data |
| CN102821408A (en) * | 2012-08-16 | 2012-12-12 | 北京拓明科技有限公司 | A-port and Abis-port signaling data based high-speed railway field network optimizing method |
| CN102821408B (en) * | 2012-08-16 | 2015-01-07 | 北京拓明科技有限公司 | A-port and Abis-port signaling data based high-speed railway field network optimizing method |
| CN104254094A (en) * | 2013-06-28 | 2014-12-31 | 珠海世纪鼎利通信科技股份有限公司 | GSM (global system for mobile communications) frequency optimization method based on interference relation of same BCCH (broadcast control channel) sections |
| CN103501502A (en) * | 2013-09-04 | 2014-01-08 | 工业和信息化部电信研究院 | Drive test method |
| CN103501502B (en) * | 2013-09-04 | 2016-09-28 | 工业和信息化部电信研究院 | A kind of road measuring method |
| CN111182577A (en) * | 2020-01-03 | 2020-05-19 | 重庆邮电大学 | CDR synthesis monitoring system and method suitable for 5G road tester |
| CN111182577B (en) * | 2020-01-03 | 2022-04-22 | 重庆邮电大学 | CDR synthesis monitoring system and method suitable for 5G road tester |
| CN112770346A (en) * | 2021-03-08 | 2021-05-07 | 中国人民解放军军事科学院战争研究院 | Base station data optimization method and device |
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Inventor after: Chen Jinrong Inventor after: Yu Hengxin Inventor after: Shao Zecai Inventor after: Li Deqiang Inventor after: Huang Weizheng Inventor before: Chen Jinrong Inventor before: Shao Zecai Inventor before: Li Deqiang Inventor before: Huang Weizheng |
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