CN102026223A - Method for testing interface protocol between radio frequency unit and baseband of 3G (3 Generation) base station - Google Patents
Method for testing interface protocol between radio frequency unit and baseband of 3G (3 Generation) base station Download PDFInfo
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Abstract
The invention relates to a method for testing an interface protocol between a radio frequency unit and a baseband of a 3G (3 Generation) base station, which comprises the following steps of: (1) carrying out initial configuration on each chip in an electrified system; (2) carrying out photoelectric conversion on up and down optical fiber links through two separate lasers to obtain two high-speed serial signals, and then recovering a clock and data from the two high-speed serial signals; (3) extracting valid IQ data (user data) and CM data (control management data) according to the Ir (Infrared) interface standard protocol frame structure; (4) continuously collecting, saving and uploading the data and identifying the uploaded data types when the analysis condition of the Ir interface standard protocol is met; (5) analyzing the uploaded data in real time according to the Ir interface standard protocol test set; and (6) and displaying the analysis results in real time with user settings. The invention can automatically and roundly test the Ir interface protocol, analyzes the integrity and consistency of the Ir interface data from different levels and angles on the basis of the computer system configuration, and effectively improves the positioning efficiency of questions.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to the method for testing of a kind of NodeB base band and radio frequency unit interface agreement.
Background technology
At present, 3G (Third Generation) Moblie (3rd Generation, the opening that the application of distributed base station system framework has brought Ir interface (base station baseband and radio frequency unit interface) 3G), its major advantage be base station baseband unit (BBU) with radio frequency unit (RRU) can flexible networking, devices from different manufacturers can be mixed use mutually, and the product price ratio improves constantly in the competition of a plurality of producers; But the opening of Ir interface also has disadvantageous one side, and this is that also there are deviation in each BBU and RRU producer to the understanding of Ir interface standard agreement simultaneously because there are two opposite sex in Ir interface standard agreement itself, and very difficult realization is interconnected.Ir interface standard protocol testing method relatively more commonly used at present mainly is to adopt all purpose instruments such as logic analyzer, oscilloscope that certain the several point in the circuit are transferred survey, can't the multi-level analyzing and positioning problem of multi-angle, efficient is low, and is unfavorable for that engineering site manipulates.
Summary of the invention
The technical problem that the present invention solves provides the method for testing of a kind of NodeB base band and radio frequency unit interface agreement, utilizes the traditional common instrument to be unfavorable for problems such as positioning problems, efficient are low, inconvenient operation to what Ir interface standard protocol test existed at present to solve.This method may further comprise the steps:
(1) each chip in the back system that powers on is carried out initial configuration;
(2) from the up-downgoing optical fiber link, recover clock and data;
(3) according to Ir interface standard protocol frame effective IQ data of structure extraction (user data) and CM data (control and management data);
(4) when satisfying Ir interface standard protocal analysis condition, begin continuous acquisition, preserve, upload data, and identify and upload data type;
(5) data are uploaded in real-time analysis according to Ir interface standard protocol test collection;
(6) analysis result is shown in real time according to the mode that the user is provided with.
Particularly, in the step (1), described initial configuration comprises that the initialization state to optical interface device, clock devices, FPGA (field programmable gate array) device, CPU (CPU) device is configured.
Preferably, the specific implementation process in the step (2) is:
Up-downgoing optical fiber at first by two independently laser carry out obtaining the two-way high-speed serial signals after the opto-electronic conversion, this two-way serial signal at a high speed contains abundant clock information and according to the data of Ir interface standard protocol transmission, utilize a binary channels SERDES (serial/parallel switching device is with the clock recovery function simultaneously) device from the two-way high-speed serial signals, to recover clock and data respectively automatically.
Preferably, described binary channels SERDES can be an independent devices, also can be a functional unit of FPGA inside, and the specific implementation process of described recovered clock and data is:
Preferably, described automatic recovery comprise fibre circuit speed automatically adaptive and according to the state after adaptive indication extracts the fibre circuit clock, output clock A, clock B, with a high performance clock C, wherein clock C is as the work clock of FPGA, external RAM (memory), so that system works is more reliable and more stable.
At first from the two-way high-speed serial signals, recover clock A and clock B respectively automatically, suppose the corresponding uplink optical fibers of described clock A, the corresponding downlink optical fiber of described clock B;
Utilize clock A that the high-speed serial signals of uplink optical fibers link is carried out serial/parallel conversion and 8B/10B decoding, obtaining a width is 8 bit parallel data D1 and the K code mark signal K1 that width is 1 bit;
Utilize clock B that the high-speed serial signals of downlink optical fiber link is carried out serial/parallel conversion and 8B/10B decoding, obtaining a width is 8 bit parallel data D2 and the K code mark signal K2 that width is 1 bit.
Preferably, the specific implementation process in the step (3) is:
According to K code mark signal K1 and the K2 that step (2) is sent, extract the frame synchronizing signal of up link and down link respectively, the corresponding described uplink optical fibers of up link, the corresponding described downlink optical fiber of down link;
According to frame synchronizing signal,, from the parallel data of 8 bit widths, extract effective IQ data and CM data successively according to the effective IQ data of Ir interface protocol regulation and the putting position of CM data.When not transmitting effective IQ data or CM data in the fiber-optic signal, output signal is set to 0.
Preferably, satisfy described in the step (4) Ir interface standard protocal analysis condition comprise following each or multinomial:
Finish in system start-up and laggardly to trigger continuous acquisition when going into frame synchronization state, preserve, upload data;
When receiving the Ir interface standard protocal analysis order that the upper strata sends, trigger continuous acquisition, preserve, upload data;
When detecting certain keyword, trigger continuous acquisition, preserve, upload data.
Preferably, step begins continuous acquisition described in (4), preserves, uploads data, and identifies the detailed process of uploading data type and be:
CPU goes out to upload data type according to the command id of upper-layer configured, uploads data type and comprises: upload effective IQ data and upload the CM data.
Preferably, if the described data type of uploading is for uploading effective IQ data, effective IQ data of continuous acquisition multiframe (specifically deciding) then with outside memory span, after finishing, preservation by data/address bus the timesharing of described effective IQ data is sent to CPU again with CPU, dump to the memory space of computer system again by CPU, after unloading was finished, CPU notice computer system was uploaded data and is finished.
Preferably, if the described data type of uploading is for uploading the CM data, then gather effective CM data in real time, be cached to internal storage, after the intact effective CM data of a frame of buffer memory, send the interrupt response signal with requests data reading to CPU, CPU dumps to the data that read the memory space of computer system again, after unloading was finished, CPU notice computer system was uploaded data and is finished.
Preferably, the specific implementation process in the step (5) is:
After computer system is received and uploaded data,, assess effective IQ data performance index according to demodulation result if effective IQ data are then carried out demodulation analysis; If the CM data are then analyzed layer by layer according to Ir interface standard protocol test collection, according to analysis result assessment CM data performance index.
Preferably, described effective IQ data performance index comprises: EVM (amplitude vector error), ICS (selectivity in the band), ASC (adjacentchannel selectivity), last line sensitivity etc.
Preferably, described CM data performance index comprises: the consistency of the integrality of Ir interface standard protocol message, Ir interface standard agreement flow process, the validity of Ir interface physical layer control word etc.
Preferably, the specific implementation process in the step (6) is:
Described data analysis result is shown in many ways in real time according to user's setting, described multiple mode comprises: decoding tree entry form, flow chart form, time flowing water form, interacting message form, graphic form etc., and to make things convenient for user's quick positioning question.
Advantage of the present invention: as can be known by above-mentioned disclosed technical scheme, according to NodeB base band of the present invention and radio frequency unit interface protocal analysis method, can be automatically test I r interface protocol all sidedly, and can be according to computer system configurations, integrality, consistency from a plurality of aspect multiple angles analysis Ir interface data have effectively improved positioning problems efficient.
Description of drawings
Fig. 1 is the schematic diagram of NodeB base band and radio frequency unit interface protocol testing system.
Fig. 2 is the flow chart of a kind of NodeB base band of the present invention and radio frequency unit interface protocol testing method.
Fig. 3 is an automatic recovered clock schematic diagram of the present invention.
Fig. 4 is that step S13 of the present invention is according to Ir interface standard protocol frame structure extraction IQ and CM schematic diagram data.
Embodiment
As shown in Figure 1, NodeB base band of the present invention and radio frequency unit interface protocol testing system comprise that photoelectric conversion section, Ir interface data extract part, data separating part, data processing section.
Uplink optical fibers and downlink optical fiber are the optical interface link between BBU and the RRU, they all are connected to laser module 101, laser module 101 is connected with 8B/10B decoding module 105 through serial/parallel modular converter 104, the output of decoding module 105 is connected with Ir interface data extraction module 106, the output of Ir interface data extraction module 106 is connected with CM data cache module 108 with IQ data cache module 107 respectively, the output of IQ data cache module 107 and CM data cache module 108 is connected with two inputs of data transmission blocks 109 simultaneously, the output of data transmission blocks 109 is connected with CPU module 110, CPU module 110 is connected with computer system 111, and CPU module 110 also is connected with data transmission blocks 109 with Ir interface data extraction module 106.
Described laser module 101 also is connected with optical link clock recovery module 102, optical link clock recovery module 102 is connected with clock jitter removing module 103, and the output of clock jitter removing module 103 is connected with serial/parallel modular converter 104,8B/10B decoding module 105, Ir interface data extraction module 106 simultaneously.
Core of the present invention is to adopt a general hardware platform that the Ir interface data is extracted, and utilizes computer software that the data of extracting are carried out the realization of method for real-timely testing then.Wherein said data extract is mainly realized by FPGA and CPU, the benefit of making is to have very strong flexibility and real-time like this, both can adapt to the development of Ir interface standard agreement and perfect, also can be applicable to the various systems of 3G/B3G/4G mobile communication, comprise TD-SCDMA (time division multiplexing S-CDMA) system, WCDMA (Wideband Code Division Multiple Access (WCDMA)) system, TD-LTE (time-division Long Term Evolution) system etc.Described data in real time analysis realizes on computer system, the benefit of doing like this is the database processing ability that can utilize computer system powerful, and processing speed fast, analyze Ir interface standard agreement more comprehensively quickly, and display analysis result in real time.In addition, technical scheme of the present invention can be applied under the working method of time division duplex (TDD) and Frequency Division Duplexing (FDD) (FDD) analysis to Ir interface standard agreement simultaneously.
Below in conjunction with accompanying drawing the present invention is described in detail.
The flow chart of a kind of NodeB base band of the present invention and radio frequency unit interface protocol testing method sees Fig. 2 for details, and described method comprises step:
Step S11: each chip in the back system that powers on is carried out initial configuration;
Step S12: from the up-downgoing optical fiber link, recover clock and data;
Step S13: according to Ir interface standard protocol frame effective IQ data of structure extraction (user data) and CM data (control and management data);
Step S14: when satisfying Ir interface standard protocal analysis condition, begin continuous acquisition, preserve, upload data, and identify and upload data type;
Step S15: data are uploaded in real-time analysis according to Ir interface standard protocol test collection;
Step S16: analysis result is shown in real time according to the mode that the user is provided with.
Comprise in initial configuration described in the step S11: the initialization state to optical interface device, clock devices, FPGA device, CPU device is configured.
In step S12, up-downgoing optical fiber at first by two independently laser carry out obtaining the two-way high-speed serial signals after the opto-electronic conversion, this two-way serial signal at a high speed contains abundant clock information and according to the data of Ir interface standard protocol transmission, utilize a binary channels SERDES (serial/parallel switching device is with the clock recovery function simultaneously) device from the two-way high-speed serial signals, to recover clock and data respectively automatically.
See also Fig. 3, be automatic recovered clock schematic diagram of the present invention.Automatically recovered clock specifically may further comprise the steps:
Step S21:CPU is provided with an initial rate 1;
Step S22:CPU reads phase-locked loop pll 1 state, judges whether locking, if locking then jumps to step S25, if do not lock then execution in step S23;
Step S23:CPU is provided with an initial rate n;
Step S24:CPU reads phase-locked loop pll 1 state, judges whether locking, then jumps to step S25 as if locking, does not begin to be provided with state if there is locking then to jump to, and promptly execution in step S21 circulates again and carries out;
Step S25: rate adapted is finished, and extracts the optical link clock.
After the optical link clock recovery, obtain described clock A and clock B.For stable work clock being provided for devices such as FPGA, external RAM, thereby improve the reliability of system, also need from clock A and clock B, to select one the tunnel as with reference to producing a high performance clock C.
Specifically be that CPU at first is provided with from uplink optical fibers or downlink optical fiber obtains clock C, because the downlink optical fiber signal is from BBU, and the uplink optical fibers signal is from RRU, and the clock of BBU is better than RRU, therefore select clock B (corresponding downlink optical fiber) conduct usually with reference to signal, by another phase-locked loop pll 2 described clock B is gone to tremble, produce a high-performance clock C that phase noise is less, frequency is more stable.Described phase-locked loop pll 2 can be a unit of described SERDES inside, also can be an independent devices.
Fig. 4 is step S13 of the present invention according to Ir interface standard protocol frame structure extraction IQ and CM schematic diagram data:
Step S31:K code mark signal and data input;
Step S32:K code mark signal continuous detecting judges whether K code mark signal is normal;
Step S33: the frame synchronizing signal that extracts up link and down link;
Step S34: with this frame synchronizing signal is time reference, judges the validity of IQ data and CM data according to Ir interface protocol regulation;
Step S35: from the parallel data of 8 bit widths, extract effective IQ data and CM data successively; When not transmitting effective IQ data and CM data in the fiber-optic signal, output signal is set to 0.
In step S13, K code mark signal K1 and K2 according to step S12 output, extract the frame synchronizing signal of up link and down link respectively, with this frame synchronizing signal is time reference, according to the effective IQ data of Ir interface protocol regulation and the putting position of CM data, from the parallel data of 8 bit widths, extract effectively effectively IQ data and CM data successively.When not transmitting effective IQ data or CM data in the fiber-optic signal, output signal is set to 0.
In step S14, when satisfying Ir interface standard protocal analysis condition, after finishing in system start-up, FPGA is by a plurality of K code marks of continuous detecting, confirm the normal laggard frame synchronization state of going into, and synchronous regime is reported CPU, trigger continuous acquisition, preserve, upload data by CPU; User's triggered protocol is analyzed, and promptly the user is by computer system starting protocal analysis flow process, and computer system sends to CPU with this order, is triggered continuous acquisition, is preserved, uploads data by CPU; The keyword triggered protocol is analyzed, be that the user is provided with hope by computer system starts the protocal analysis flow process after capturing certain data, described keyword is given CPU by computer system configurations, send to FPGA again by CPU, FPGA detects the data after Ir interface standard agreement proposes in real time, just send interrupt request singal to CPU immediately in case match keyword, trigger continuous acquisition, preserve, upload data by CPU.CPU goes out to upload data type according to the command id of upper-layer configured, uploads data type and comprises: upload effective IQ data and upload the CM data, CPU will upload the data type sign and send to FPGA simultaneously.
When uploading data, if the described data type of uploading is for uploading the IQ data, continuous acquisition multiframe IQ data (specifically deciding) then with outside memory span, after finishing, preservation by data/address bus the timesharing of described IQ data is sent to CPU again with CPU, dump to the memory space of computer system again by CPU, after unloading was finished, CPU notice computer system was uploaded data and is finished.
When uploading data, if the described data type of uploading is for uploading the CM data, then gather effective CM data in real time, be cached to internal storage, after the intact effective CM data of a frame of buffer memory, send the interrupt response signal with requests data reading to CPU, CPU dumps to the data that read the memory space of computer system again, after unloading was finished, CPU notice computer system was uploaded data and is finished.
In step S15, after computer system is received and uploaded data,, assess effective IQ data performance index according to demodulation result if effective IQ data are then carried out demodulation analysis; If the CM data are then analyzed layer by layer according to Ir interface standard protocol test collection, according to analysis result assessment CM data performance index.Described effective IQ data performance index comprises: EVM (amplitude vector error), ICS (selectivity in the band), ASC (adjacentchannel selectivity), last line sensitivity etc.Described CM data performance index comprises: the consistency of the integrality of Ir interface standard protocol message, Ir interface standard agreement flow process, the validity of Ir interface physical layer control word etc.
In step S16, described data analysis result is shown in many ways in real time according to user's setting, described multiple mode comprises: decoding tree entry form, flow chart form, time flowing water form, interacting message form, graphic form etc., and to make things convenient for user's quick positioning question.
In sum, according to a kind of NodeB base band of the present invention and radio frequency unit interface protocol testing method, can be automatically test I r interface protocol all sidedly, and can be according to computer system configurations, integrality, consistency from a plurality of aspect multiple angles analysis Ir interface data have effectively improved positioning problems efficient.
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 (10)
1. the method for testing of NodeB base band and radio frequency unit interface agreement may further comprise the steps:
(1) each chip in the back system that powers on is carried out initial configuration;
(2) from the up-downgoing optical fiber link, recover clock and data;
(3) according to effective IQ data of Ir interface standard protocol frame structure extraction and CM data;
(4) when satisfying Ir interface standard protocal analysis condition, begin continuous acquisition, preserve, upload data, and identify and upload data type;
(5) data are uploaded in real-time analysis according to Ir interface standard protocol test collection;
(6) analysis result is shown in real time according to the mode that the user is provided with.
2. the method for testing of NodeB base band according to claim 1 and radio frequency unit interface agreement is characterized in that: the specific implementation process in the described step (2) is:
Up-downgoing optical fiber at first by two independently laser carry out obtaining the two-way high-speed serial signals after the opto-electronic conversion, this two-way serial signal at a high speed contains clock information and according to the number of Ir interface standard protocol transmission, the serial/parallel switching device SERDES of binary channels that utilizes a band clock recovery function automatic recovered clock and data respectively from the two-way high-speed serial signals.
3. the method for testing of NodeB base band according to claim 2 and radio frequency unit interface agreement, it is characterized in that: described automatic recovery comprise fibre circuit speed automatically adaptive and according to the state after adaptive indication extracts the fibre circuit clock, the specific implementation process of described automatic recovered clock and data is:
At first recover clock A, clock B and a high performance clock C from the two-way high-speed serial signals respectively automatically, wherein clock C is as the work clock of FPGA, external memory RAM; Suppose the corresponding uplink optical fibers of described clock A, the corresponding downlink optical fiber of described clock B:
Utilize clock A that the high-speed serial signals of uplink optical fibers link is carried out serial/parallel conversion and 8B/10B decoding, obtaining a width is 8 bit parallel data D1 and the K code mark signal K1 that width is 1 bit;
Utilize clock B that the high-speed serial signals of downlink optical fiber link is carried out serial/parallel conversion and 8B/10B decoding, obtaining a width is 8 bit parallel data D2 and the K code mark signal K2 that width is 1 bit.
4. according to the method for testing of claim 1 or 3 described NodeB base band and radio frequency unit interface agreement, it is characterized in that: the specific implementation process in the step (3) is:
Extract the frame synchronizing signal of up link and down link respectively according to K code mark signal, with this frame synchronizing signal is time reference, according to the effective IQ data of Ir interface protocol regulation and the putting position of CM data, from the parallel data of 8 bit widths, extract effective IQ data and CM data successively; When not transmitting effective IQ data and CM data in the fiber-optic signal, output signal is set to 0.
5. the method for testing of NodeB base band according to claim 1 and radio frequency unit interface agreement is characterized in that: satisfy described in the step (4) Ir interface standard protocal analysis condition comprise following each or multinomial:
After system start-up is finished, when entering frame synchronization state, trigger continuous acquisition, preserve, upload data;
When receiving the Ir interface standard protocal analysis order that the upper strata sends, trigger continuous acquisition, preserve, upload data;
When detecting certain keyword, trigger continuous acquisition, preserve, upload data.
6. the method for testing of NodeB base band according to claim 1 and radio frequency unit interface agreement is characterized in that: the specific implementation process in the step (5) is:
After computer system is received and uploaded data,, assess the performance index of effective IQ data according to demodulation result if validated user data I Q then carries out demodulation analysis; If the CM data are then analyzed layer by layer according to Ir interface standard protocol test collection, according to the performance index of analysis result assessment CM data.
7. according to the method for testing of claim 1 or 2 described NodeB base band and radio frequency unit interface agreement, it is characterized in that: if described when to upload data type be effective IQ data, effective IQ data of continuous acquisition multiframe then, after finishing, preservation by data/address bus the timesharing of described effective IQ data is sent to CPU again with CPU, CPU goes out to upload data type according to the command id of upper-layer configured, after the memory space unloading that dumps to computer system again by CPU was finished, CPU notice computer system was uploaded data and is finished.
8. the method for testing of NodeB base band according to claim 1 and 2 and radio frequency unit interface agreement, it is characterized in that: if described when uploading data type and being the CM data, then gather the CM data in real time, be cached to internal storage, after the intact frame CM data of buffer memory, send the interrupt response signal with requests data reading to CPU, CPU goes out to upload data type according to the command id of upper-layer configured, CPU dumps to the data that read the memory space of computer system again, after unloading was finished, CPU notice computer system was uploaded data and is finished.
9. according to the method for testing of claim 1 or 6 described NodeB base band and radio frequency unit interface agreement, it is characterized in that: the performance index of described CM data comprise: the consistency of the integrality of Ir interface standard protocol message, Ir interface standard agreement flow process, the validity of Ir interface physical layer control word; The performance index of described effective IQ data comprise: selectivity ICS, adjacentchannel selectivity ASC reach and go up line sensitivity in amplitude vector error EVM, the band.
10. the method for testing of NodeB base band according to claim 1 and 2 and radio frequency unit interface agreement, it is characterized in that: in the step (6) described data analysis result is provided with according to the user, show in real time in many ways, described multiple mode comprises: decoding tree entry form, flow chart form, time flowing water form, interacting message form, graphic form, and to make things convenient for user's quick positioning question.
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| CN110958058A (en) * | 2019-11-25 | 2020-04-03 | 大唐半导体科技有限公司 | FPGA platform wireless communication baseband debugging method and device |
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Application publication date: 20110420 |