CN1758780A - Reglation testing axiliary interface device of radio base station and testing system using it - Google Patents
Reglation testing axiliary interface device of radio base station and testing system using it Download PDFInfo
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- CN1758780A CN1758780A CN 200410080850 CN200410080850A CN1758780A CN 1758780 A CN1758780 A CN 1758780A CN 200410080850 CN200410080850 CN 200410080850 CN 200410080850 A CN200410080850 A CN 200410080850A CN 1758780 A CN1758780 A CN 1758780A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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Abstract
A device of debugging auxiliary interface on radio base station consists of transmission interface unit coupled on baseband processing unit or radio frequency unit coupled of radio base station for receiving interface data of baseband processing unit or radio frequency unit, data processing unit coupled with transmission interface unit for processing interface data received by transmission interface unit, computer interface unit coupled with data processing unit for receiving the debugging command of user. The test system applying said device can debug base station system with different interface standard and different network integration conveniently and simply.
Description
Technical field
The present invention relates to the communication equipment technical field, be specifically related to a kind of wireless base station and transfer the test macro of surveying the satellite interface device and utilizing its realization.
Background technology
Mainly be responsible for and wireless relevant various functions base station in the mobile communication system, the UM interface (base station sub-system and travelling carriage interface) of connecting system is provided for MS (travelling carriage), directly be connected by wireless with MS, the influence that in the system break down to whole mobile network in the base station is very big.Along with the develop rapidly of mobile communication cause, base station number sharply increases, and distribution situation is intricate, and feasible accent to base station system surveys and maintenance work becomes increasingly complex.
At present, the network coverage and engineering design for convenience separates baseband processing unit and RF processing unit usually in physics realization.RF processing unit comprises receive path and transmission channel for base station system provides physical layer transmission of radio links, dependence test and the alarm function of air interface.In receive path, radiofrequency signal downconverts to baseband signal and handles for Base Band Unit through amplification, filtering; And in transmission channel, base-band analog signal is radiate by the sky alignment in the air through modulation, amplification, up-conversion to radiofrequency signal.
Interface between baseband processing unit and the RF processing unit is by standard agreement or manufacturer's custom protocol definition.
Existing standard mainly contains following two:
1, OBSAI (open architecture of base station)
2, CPRI (common public radio interface)
Simultaneously, also all there is ripe self-defining interface in each manufacturer, supports separately rack inside, radio frequency to zoom out and the application of cabinet.
Base station equipment need be transferred survey to this equipment when installing and safeguarding.The accent of base station is surveyed framework as shown in Figure 1 in the prior art.By this figure as seen, the accent of base station equipment surveyed all be based on whole base station system, promptly in a complete system link, survey the backstage by the accent of real system and debug.The accent of system is surveyed the backstage and is made up of computer that is connected with network interface, serial ports and system and the debugging software that moves above thereof usually.
Because base station system running environment is ever-changing, actual motion scene, base station can be telecommunications building, simple and easy machine room, field, iron tower etc., therefore has the possibility of on-the-spot location.But the base station system circumstance complication, intermediate link is many, debug system, will set up the link that runs through system, carries out various debugging on the basis of this complete system link.Therefore radio frequency and separately debugging of base band also just can't can't be distinguished the fault of radio frequency and baseband portion, and then can't be goed deep into the place of fault location in the debugging.
The wireless system complexity usually needs the emulated data of baseband portion is passed through radio frequency part, verifies on analog domain; The data that simultaneously also can gather actual radio frequency system or on-site wireless network signal environment are analyzed in simulation model, are verified.Present way is to carry out the input and the collection of data in the base station system of reality, but need the extra support of base station system, such as, leave the external interface that can make things convenient for data acquisition, communication link, special control command, operation etc., operate to make things convenient for the base station design personnel.As seen, in transferring the survey process, need whole link to cooperate, make that the back work amount is big, locating speed is slow; And some complementary designs that survey is carried out at accent are subject to current system, the shortage versatility; Radio frequency and baseband interface data volume are big simultaneously, and usually simple near-end maintaining bandwidth chahnel and real-time all are unfavorable for positioning problems.
Summary of the invention
The objective of the invention is to solve in the prior art base station system is transferred the shortcoming that realization is complicated, accent survey interface does not have versatility when surveying, provide a kind of wireless base station to transfer and survey the satellite interface device, transfer with the base station system that adapts to distinct interface standard and networking mode simply and easily and survey.
Another object of the present invention is to provide a kind of and utilizes described wireless base station to transfer the test macro of surveying the realization of satellite interface device, to solve test macro complexity in the prior art, the auxiliary big problem of support performance amount, realization improves fault location speed to the independent test of base station system different units.
The objective of the invention is to be achieved through the following technical solutions:
A kind of wireless base system is transferred and is surveyed the satellite interface device, and described wireless base system comprises baseband processing unit and RF processing unit, and described device comprises:
The coffret unit is coupled in described baseband processing unit or RF processing unit, is used to receive the interface data of baseband processing unit or RF processing unit;
Data processing unit is coupled in described coffret unit, is used for the interface data that described coffret unit receives is handled;
Computer interface unit is coupled in described data processing unit, is used to receive user's accent survey order.
Described coffret unit is specially: self defined interface or open architecture of base station interface or common public radio interface.
Described coffret unit is realized by optical interface and/or electrical interface.
Described data processing unit comprises:
Programmable logic cells is coupled in described coffret unit, is used to simulate the function of described baseband processing unit or RF processing unit, finishes the processing to described interface data;
Control unit is coupled in described computer interface unit and described programmable logic cells respectively, is used for controlling described programmable logic cells according to the user command of described computer interface unit and finishes processing to described interface data.
Described device also comprises:
The display interface unit is coupled in described control unit, be used to show described data processing unit result and with the information of described device interface equipment.
Described computer interface unit comprises: RS232 interface, network interface, USB (universal serial bus).
The test macro of surveying the realization of satellite interface device is transferred in a kind of described wireless base station of claim 1 that utilizes, and comprising: terminal surveyed in base station unit under test, accent, and especially, described system also comprises:
The satellite interface device surveyed in described accent, is coupled in described base station unit under test and described accent respectively and surveys terminal, is used for auxiliary described accent and surveys terminal and finish test to described base station unit under test.
Described base station unit under test is specially: baseband processing unit.
Described base station unit under test is specially: RF processing unit.
Described accent is surveyed the satellite interface device and is specifically comprised:
The coffret unit is coupled in described base station unit under test, is used to receive the interface data of described base station unit under test;
Data processing unit is coupled in described coffret unit, is used for the interface data that described coffret unit receives is handled;
Computer interface unit is coupled in described data processing unit and described accent respectively and surveys terminal, is used to receive described accent and surveys the accent survey order that terminal is sent.
By above technical scheme provided by the invention as can be seen, apparatus of the present invention are by the function of analog radio frequency processing unit and baseband processing unit, the back work when having reduced to base station testing, thus reduced the complexity of base station design; This device can be suitable for different system configuration, different interface standard and networking mode by different Interface design, by the interface with computer is provided, has further improved the flexibility and the autgmentability of testing; The test macro that utilizes this device to realize can independently be finished the test to RF processing unit or baseband processing unit, not limited by current base station system, and accent is surveyed convenient and improved fault location speed.
Description of drawings
Fig. 1 is that configuration diagram surveyed in the accent of base station in the prior art;
Fig. 2 is that wireless base system of the present invention is transferred the structural representation of surveying the satellite interface device;
Fig. 3 is the first example structure schematic diagram of apparatus of the present invention;
Fig. 4 is the second example structure schematic diagram of apparatus of the present invention;
Fig. 5 is the networking schematic diagram of system of the present invention;
Fig. 6 is the test macro networking schematic diagram when utilizing apparatus of the present invention that baseband processing unit is tested;
Fig. 7 is the test macro networking schematic diagram when utilizing apparatus of the present invention that RF processing unit is tested.
Embodiment
Core of the present invention is by the design base station system and transfers the interface arrangement of surveying between the terminal, make it can the analog radio frequency processing unit and the function of baseband processing unit, when baseband processing unit is tested, it is linked to each other with baseband processing unit, the analog radio frequency processing unit is finished the reception to the baseband processing unit interface data, handle, when RF processing unit is tested, it is linked to each other with RF processing unit, the Analog Baseband processing unit is finished the reception to the RF processing unit interface data, handle, make the test of baseband processing unit and RF processing unit is independently carried out, improve fault location speed.
The present technique field personnel know, cell mobile communication systems mainly is made up of exchanging network subsystem, wireless base system and travelling carriage three parts.Base station system is to be controlled by MSC (mobile services switching centre) in certain radio coverage, and with the system equipment that travelling carriage communicates, it mainly is responsible for finishing functions such as wireless transmission reception and RRM.Functional entity can be divided into baseband processing unit and RF processing unit, wherein, baseband processing unit has the function that one or more RF processing units are controlled, and mainly is responsible for management, cell configuration data management, power control, location and the switching etc. of Wi-Fi resource.RF processing unit is the radio interface equipment of base station system, mainly is responsible for wireless transmission, finishes functions such as wireless and wired conversion, wireless diversity, wireless channel encryption, frequency hopping.Whether normally the technical indicator whether base station system reaches regulation is the wireless network key point of operation.Therefore, the test to base station system mainly is to see whether tested item meets the specific technology index usually, such as:
For cdma system, can test channel power, receive channel power, the monitoring band channel, occupied bandwidth, adjacent channel power, code channel, modulation accuracy, spuious in the band, band is outer spuious, and it is spuious etc. to receive spuious and harmonic wave;
For gsm system, can test the output radio spectrum, the phase frequency mistake, power and time, power step size, transmitted power, the monitoring band channel, band is outer spuious, receives spuious and the transmission wave band spuious etc.
According to these test results, whether the running status that can analyze base station system is normal.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 2, Fig. 2 is that wireless base system of the present invention is transferred the structural representation of surveying the satellite interface device:
Apparatus of the present invention comprise: the computer interface unit 21 that be used to receive base station system transmission of Information interface unit 23, the data processing unit 22 that links to each other with coffret unit 23, links to each other with data processing unit.
The interface data that 22 pairs of coffret unit of data processing unit receive is handled accordingly.When the coffret unit links to each other with the baseband processing unit of wireless base system, the function of this data processing unit analog radio frequency processing unit, the interface data of the baseband processing unit that the coffret unit is received carries out simulation process, such as, the power amplification of radiofrequency signal, like this, just can obtain to handle back information, can for further testing and analysis according to these information to baseband processing unit.Equally, when the coffret unit links to each other with the RF processing unit of wireless base system, the function of this data processing unit Analog Baseband processing unit, the interface data of the RF processing unit that the coffret unit is received carries out simulation process, such as, Rake reception, equilibrium, D/A, mould/number conversion etc., like this, just can obtain to handle back information, can for further testing and analysis according to these information to RF processing unit.
The processing of 22 pairs of base station system interface data of data processing unit needs the control of external command, and order surveyed in the accent that receives the user by computer interface unit 21, so that finish corresponding work.Computer interface unit can be the RS232 serial line interface, also can be network interface, USB (USB) interface, certainly, also can provide different interfaces simultaneously, is convenient to link to each other with different testing equipments.Such as, when when the base station near-end is tested, can adopt RS232 and transfer the survey terminal to link to each other; If present position, base station complexity when being not easy to the near-end test, can be passed through network interface, utilize LAN to finish test process.
With reference to Fig. 3, Fig. 3 is the first example structure schematic diagram of apparatus of the present invention:
When the coffret unit links to each other with the baseband processing unit of wireless base system, the coffret unit receives the interface data of baseband processing unit, the user is by the function of computer interface unit command control unit control programmable logic cells analog radio frequency processing unit, and the docking port data are handled accordingly; Equally, when the coffret unit links to each other with the RF processing unit of wireless base system, the interface data of coffret unit received RF processing unit, the user is by the function of computer interface unit command control unit control programmable logic cells Analog Baseband processing unit, and the docking port data are handled accordingly.
Like this, control unit is according to user's order, the control programmable logic cells is when testing different tested objects, finish different functions, make to the test of baseband processing unit with to the test of RF processing unit can not rely on existing base station system and independently finish, reduce extra back work.
With reference to Fig. 4, Fig. 4 is the second example structure schematic diagram of apparatus of the present invention:
For convenience to reaching the monitoring of data processed result for information about with this device interface equipment, when test with data processed result and Interface status, show with the operating state of this device interface equipment, on first embodiment of apparatus of the present invention shown in Figure 3, increased the display interface unit 24 that links to each other with control unit 221, can show relevant information in real time by this display interface unit.For example stipulated mode bit, alarm position and communication signaling link in CPRI (common public radio interface) agreement, can obtain these information, shown some key message by display interface unit 24 then by the connection of interface; The result that can also show in addition, programmable logic cells in real time by control unit.Control unit is as the core control section of this device, between it and each unit communication interface arranged, for example data/address bus, serial ports etc.Control unit can constantly obtain the information of various piece in this device, comprises the operating state, result of programmable logic cells and CPRI/OBSAI interface unit etc., by control unit control these information is shown by the display interface unit.
Utilize the invention described above wireless base system transfer to survey the satellite interface device and can realize test simply base station system.
The networking diagram of system of the present invention is as shown in Figure 5:
Comprise: transfer to survey terminal 51, base station unit under test 52, be coupled in base station unit under test and transfer the accent of surveying terminal to survey satellite interface device 53 respectively, be used for auxiliary the accent and survey terminal and finish test the base station unit under test.
The base station unit under test can be the baseband processing unit in the base station system, it also can be the RF processing unit in the base station system, survey the independent test that satellite interface device 53 can be realized baseband processing unit in the base station system or RF processing unit by transferring, do not need baseband processing unit and RF processing unit in the real system auxiliary mutually, but by transferring survey satellite interface device 53 its functions of simulation to realize.
When transferring survey, at first survey terminal transmission test command by transferring by the user, transfer survey satellite interface device to receive this order by computer interface unit, and, the data that receive are handled accordingly according to test command by data processing unit then by the data that reception base station, coffret unit unit under test sends; Then result is sent to transfer by computer interface and surveys terminal 51, transfer the survey terminal that these results are analyzed, obtain final test result.
Test macro networking diagram when Fig. 6 shows baseband processing unit tested:
Transfer to survey terminal 51 and realize, survey satellite interface device 53 and link to each other with baseband processing unit 61 by transferring by common computer.
By this figure as seen, when baseband processing unit is tested, do not need the RF processing unit of real system to participate in back work, but simulate the processing capacity that realizes RF processing unit by transfer surveying satellite interface device 53, the ligand tape handling unit is finished the modulating/demodulating, transmission/reception of baseband signal etc.Transfer the survey terminal to exchange the result of surveying satellite interface device 53 and analyze, obtain test result.
Such as, at the scene, base station equipment breaks down, the data that need to gather between base band and the radio frequency are analyzed and are handled, perhaps need analytical test Base-Band Processing part whether normal, can be connected to apparatus of the present invention on the baseband processing unit and baseband processing unit connects, the function of analog radio frequency processing unit is finished above-mentioned test function.
In the exploitation debugging, Radio frequency Processing Unit, RF Processing Unit may partly be carried out slowly than Base-Band Processing, and when the debugging baseband processing unit need be used the Radio frequency Processing Unit, RF Processing Unit cooperation, Radio frequency Processing Unit, RF Processing Unit can't put in place, this moment can by interface equipment directly and Base-Band Processing set up service channel, debug.
Test macro networking diagram when Fig. 7 shows RF processing unit tested:
Transfer to survey terminal 51 and realize, survey satellite interface device 53 and link to each other with RF processing unit 62 by transferring by common computer.
By this figure as seen, when RF processing unit is tested, do not need the baseband processing unit of real system to participate in back work, but survey the processing capacity that satellite interface device 53 is simulated the realization baseband processing unit by transferring, cooperate RF processing unit to finish the frequency conversion of high-frequency signal, system clock extraction, voice signal encoding and decoding etc.Transfer the survey terminal to exchange the result of surveying satellite interface device 53 and analyze, obtain test result.
Such as, at the scene, base station equipment breaks down, and the data that need to gather between base band and the radio frequency are analyzed and are handled, and perhaps need to import special test data to RF processing unit, promptly need the unsupported test function flexibly of baseband processing unit.At this moment, can disconnect the connection between baseband processing unit and the RF processing unit, will transfer the survey terminal to be connected on the RF processing unit, finish above-mentioned test function by apparatus of the present invention.
And, in the exploitation debugging, the Base-Band Processing part may be carried out slowly than Radio frequency Processing Unit, RF Processing Unit, when the debugging radio frequency processing unit need be used Base-Band Processing and partly cooperates, the Base-Band Processing part can't put in place, this moment can by apparatus of the present invention directly and RF processing unit set up service channel, debug.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (10)
1, a kind of wireless base system is transferred and is surveyed the satellite interface device, and described wireless base system comprises baseband processing unit and RF processing unit, it is characterized in that, described device comprises:
The coffret unit is coupled in described baseband processing unit or RF processing unit, is used to receive the interface data of baseband processing unit or RF processing unit;
Data processing unit is coupled in described coffret unit, is used for the interface data that described coffret unit receives is handled;
Computer interface unit is coupled in described data processing unit, is used to receive user's accent survey order.
2, device according to claim 1 is characterized in that, described coffret unit is specially: self defined interface or open architecture of base station interface or common public radio interface.
3, device according to claim 1 is characterized in that, described coffret unit is realized by optical interface and/or electrical interface.
4, device according to claim 1 is characterized in that, described data processing unit comprises:
Programmable logic cells is coupled in described coffret unit, is used to simulate the function of described baseband processing unit or RF processing unit, finishes the processing to described interface data;
Control unit is coupled in described computer interface unit and described programmable logic cells respectively, is used for controlling described programmable logic cells according to the user command of described computer interface unit and finishes processing to described interface data.
5, device according to claim 1 is characterized in that, described device also comprises:
The display interface unit is coupled in described control unit, be used to show described data processing unit result and with the information of described device interface equipment.
6, device according to claim 1 is characterized in that, described computer interface unit comprises: RS232 interface, network interface, USB (universal serial bus).
7, the test macro of surveying the realization of satellite interface device is transferred in a kind of described wireless base station of claim 1 that utilizes, and comprising: terminal surveyed in base station unit under test, accent, it is characterized in that described system also comprises:
The satellite interface device surveyed in described accent, is coupled in described base station unit under test and described accent respectively and surveys terminal, is used for auxiliary described accent and surveys terminal and finish test to described base station unit under test.
8, system according to claim 7 is characterized in that, described base station unit under test is specially: baseband processing unit.
9, system according to claim 7 is characterized in that, described base station unit under test is specially: RF processing unit.
10, system according to claim 7 is characterized in that, described accent is surveyed the satellite interface device and specifically comprised:
The coffret unit is coupled in described base station unit under test, is used to receive the interface data of described base station unit under test;
Data processing unit is coupled in described coffret unit, is used for the interface data that described coffret unit receives is handled;
Computer interface unit is coupled in described data processing unit and described accent respectively and surveys terminal, is used to receive described accent and surveys the accent survey order that terminal is sent.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100808503A CN100359971C (en) | 2004-10-09 | 2004-10-09 | Reglation testing axiliary interface device of radio base station and testing system using it |
| PCT/CN2005/001614 WO2006037271A1 (en) | 2004-10-09 | 2005-09-29 | Wireless base station testing auxiliary interface device and wireless base station testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100808503A CN100359971C (en) | 2004-10-09 | 2004-10-09 | Reglation testing axiliary interface device of radio base station and testing system using it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1758780A true CN1758780A (en) | 2006-04-12 |
| CN100359971C CN100359971C (en) | 2008-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100808503A Expired - Fee Related CN100359971C (en) | 2004-10-09 | 2004-10-09 | Reglation testing axiliary interface device of radio base station and testing system using it |
Country Status (2)
| Country | Link |
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| CN (1) | CN100359971C (en) |
| WO (1) | WO2006037271A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557598B (en) * | 2008-04-07 | 2011-04-20 | 中兴通讯股份有限公司 | Device and method for testing wireless baseband chips in base station side |
| CN102045739A (en) * | 2009-10-22 | 2011-05-04 | 中兴通讯股份有限公司 | Debugging device and method for debugging roadside base station |
| CN102136868A (en) * | 2011-05-09 | 2011-07-27 | 广州茂腾信息科技有限公司 | Baseband unit (BBU)-radio remote unit (RRU) failure judgment method for telecom base station |
| CN101360311B (en) * | 2007-07-30 | 2011-08-31 | 大唐移动通信设备有限公司 | Test maintaining system and method |
| CN101277503B (en) * | 2007-03-27 | 2012-09-05 | 中兴通讯股份有限公司 | Method for supporting WiMAX system test of analog baseband |
| CN102695184A (en) * | 2012-05-22 | 2012-09-26 | 大唐移动通信设备有限公司 | Base station testing system and method |
| CN113395715A (en) * | 2020-03-12 | 2021-09-14 | 中移(成都)信息通信科技有限公司 | Method, device and equipment for testing physical layer of base station and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100222001B1 (en) * | 1997-07-02 | 1999-10-01 | 윤종용 | A fault diagnostic method of in-door system of rf receive path in cdma base-station system |
| WO1999043174A1 (en) * | 1998-02-23 | 1999-08-26 | Qualcomm Incorporated | Configuration of a base station transceiver system in a mobile communication system |
| DE10124372A1 (en) * | 2001-05-18 | 2002-11-21 | Rohde & Schwarz | Signal generator with optional simulation of channel fading, distortion and noise, employs two base band units, frequency changer, adder and I-Q modulator |
| CN100388656C (en) * | 2002-10-31 | 2008-05-14 | 中兴通讯股份有限公司 | Base station controller/base station receiving/transmitting information apparatus imitator in CDMA system |
| KR20040043748A (en) * | 2002-11-19 | 2004-05-27 | 엘지전자 주식회사 | Mobile communication system capable of on-line function test |
-
2004
- 2004-10-09 CN CNB2004100808503A patent/CN100359971C/en not_active Expired - Fee Related
-
2005
- 2005-09-29 WO PCT/CN2005/001614 patent/WO2006037271A1/en active Application Filing
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277503B (en) * | 2007-03-27 | 2012-09-05 | 中兴通讯股份有限公司 | Method for supporting WiMAX system test of analog baseband |
| CN101360311B (en) * | 2007-07-30 | 2011-08-31 | 大唐移动通信设备有限公司 | Test maintaining system and method |
| CN101557598B (en) * | 2008-04-07 | 2011-04-20 | 中兴通讯股份有限公司 | Device and method for testing wireless baseband chips in base station side |
| CN102045739A (en) * | 2009-10-22 | 2011-05-04 | 中兴通讯股份有限公司 | Debugging device and method for debugging roadside base station |
| CN102136868A (en) * | 2011-05-09 | 2011-07-27 | 广州茂腾信息科技有限公司 | Baseband unit (BBU)-radio remote unit (RRU) failure judgment method for telecom base station |
| CN102136868B (en) * | 2011-05-09 | 2015-02-25 | 广州茂腾信息科技有限公司 | Baseband unit (BBU)-radio remote unit (RRU) failure judgment method for telecom base station |
| CN102695184A (en) * | 2012-05-22 | 2012-09-26 | 大唐移动通信设备有限公司 | Base station testing system and method |
| CN102695184B (en) * | 2012-05-22 | 2015-04-01 | 大唐移动通信设备有限公司 | Base station testing system and method |
| CN113395715A (en) * | 2020-03-12 | 2021-09-14 | 中移(成都)信息通信科技有限公司 | Method, device and equipment for testing physical layer of base station and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006037271A1 (en) | 2006-04-13 |
| CN100359971C (en) | 2008-01-02 |
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