CN103763719A - Simulation drive test method for TD-LTE system - Google Patents
Simulation drive test method for TD-LTE system Download PDFInfo
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Abstract
Provided is a simulation drive test method for a TD-LTE system. First, SINR and RSRP of a drive test terminal test and statistics drive test transmission line are used in a practical TD-LTE network environment, sampling is carried out at a set cycle, sampling values are stored, and then the sampling values are transmitted to a computer; the computer processes the sampling values, wherein RSRP and SINR between the two sampling values are filled up at the minimum cycle which can be identified by a channel simulator, and then the channel simulator connected between an indoor base station and a terminal is introduced; an outer field practical transmission line simulation environment is achieved indoors, wherein noise is added into the channel simulator, so that SINR which passes through the channel simulator and SINR which is recorded practically in an outer field are identical or similar in numerical value and changing trend; and then according to reference signal receiving power, output signal power of the channel simulator is controlled, so that indoor testing of the terminal can have the same or similar performance as outer field testing. According to the method, manpower, material resources, financial resources and time cost of outdoor scenario test are greatly saved, problem reappearing is convenient, and a test process is simplified.
Description
Technical field
The present invention relates to a kind of time division duplex-Long Term Evolution TD-LTE(Time Divison-Long Term Evolution for drive test data) the simulation road measuring method of system, belong to the technical field of radio communication.
Background technology
Along with the develop rapidly of mobile Internet, the focal point of network is progressively transitioned into data service from traditional speech business.The 2G(second generation of China commercialization) and the 3G(third generation) capacity of wireless communication system is day by day saturated, is badly in need of using new technology further to promote spectrum efficiency and the network coverage.At present, a plurality of countries have successively opened the 4th generation of 4G(in the world) commercial business, Communication in China operator also has a deep accumulation 4G is technical.China Mobile just starts the degree of depth and participates in the collection process of 4G technical draft in 2005, has completed engineering test, the scale test of TD-LTE and the test job of expanding large-scale experiment three phases at present, is about to enter commercialization.TD-LTE is as one of two mainstream technologys of 4G mobile communication, because it adopts a large amount of advanced technologies, such as: dual-stream beamforming, OFDM, high order modulation etc., the transmision peak speed of wireless system is compared with 2G, 3G, there is significant lifting.
Wireless communication system is entering before commercialization, conventionally need to pass through following six test processs: the checking of (1) computerized algorithm; (2) prototype exploitation; (3) Meter Test; (4) indoor test; (5) field testing; (6) device fabrication.Wherein, computerized algorithm Qualify Phase is according to 3GPP(third generation partner plan) agreement builds emulation platform, function and the performance of checking key technology.Then write the program of control hardware operation, utilize programmable logic array FPGA that key algorithm is done to further testing authentication at hardware platform.Complete after checking, manufacturer will produce a small amount of model machine in the prototype development phase, and adopt traditional uniformity test instrument, according to signaling process, this model machine be carried out to checkout.Then, complete the early-stage preparations of interconnecting between base station equipment and terminal key chip, be that Meter Test is after the stage, just first carry out indoor Meter Test, then, carry out the indoor test stage: indoor, start to carry out real equipment test and the test of interconnecting.By indoor checking repeatedly, test and modification, performance prototype is possessed behind the basis of field trial test, again under real outdoor scene environment, dispose to need the network equipment of test, and design outdoor scene test transmission route (at least comprise cover, in, poor a plurality of different transmission line scenes).Now, just drive test terminal is put into access network on test route, Signalling exchange and throughput between testing authentication itself and base station, record every data that drive test terminal transmits, and analyzed, study and store (being the field testing stage).The emphasis of outfield drive test is whether the signaling of attention location system and terminal lacks, throughput and the network coverage whether normal.After completing above-mentioned all testing processs, research and development and the test job of product just complete substantially, equipment vendors and then enter commercial production and practical stage (being the device fabrication stage).
TD-LTE is the follow-up evolution of TD-SCDMA, and Ye Shi China has the 4th generation mobile communication international standard of independent intellectual property right.Because TD-LTE communication standard is introduced a large amount of wireless advanced technologies, make the test event of TD-LTE equipment in indoor and field testing very loaded down with trivial details, content measurement is also very complicated.Although the model machine of test terminal has passed through indoor test,, in indoor functional test, the connection between test terminal model machine and the network equipment is to adopt RF cable direct-connected substantially, communication environments is comparatively desirable.In the performance test of indoor scene, between test terminal model machine and the network equipment, by channel simulator, connect, and in channel simulator, move channel files and carry out analogue radio transmissions channel.The channel model that channel simulator is used is the theoretical model of agreement regulation normally, and itself and actual propagation environment still exist larger difference.Therefore, field testing is indispensable, very necessary.
Checking repeatedly under real network environment and in testing vehicle that field testing needs tester.But, because outdoor communication environments is very complicated, being subject to the impact of the different situations such as weather, vehicle, road and environment, the problem occurring in test if will reappear is very difficult.Therefore,, how at lab simulation outdoor environment, in the indoor partial test content that completes outfield, become the focal issue that equipment vendors and manufacturers are concerned about day by day.
Summary of the invention
In view of this, the object of this invention is to provide a kind of simulation road measuring method for TD-LTE system, first the method is used driver test system in outfield, to gather crucial reception parameter Signal to Interference plus Noise Ratio SINR(Signal to Interference-plus-Noise Ratio) and Reference Signal Received Power RSRP(Reference Signal Receiving Power), the communication environments of the outer real space signal of recording room.Then, driver test system passes to test computer by key parameter, writes the execute file of channel simulator and imports channel simulator and move it.Between transmitting terminal and receiving terminal, control again the decay of transmission link and add noise, measurement result and the field testing record of reception signal SINR after channel simulator and RSRP of making to transmit can reach unanimity, thereby guarantees in the indoor throughput identical with outfield drive test or the performance of other parameters just can simulated.
In order to achieve the above object, the invention provides a kind of simulation road measuring method for TD-LTE system, it is characterized in that: first in actual TD-LTE network environment, use the letter on drive test terminal test and statistics drive test transmission line dry than the received power RSRP of SINR and reference signal, and with setting cycle sample and store sample value after, then pass to computer; Computer is processed the sampled value receiving: the minimum period that can identify with channel simulator, fill up after two RSRP and SINR between sampled value, and import and be connected to the channel simulator between indoor base station and terminal; Again at the indoor environment that completes simulation outfield actual transmissions route: add noise in channel simulator, make through the signal SINR of channel simulator identical with variation tendency or close with the numerical value of the actual signal SINR recording in outfield; According to the received power of reference signal, the power of control channel simulator output signal, makes terminal just can access identical with field testing or akin performance at indoor test again; Described method comprises following operating procedure:
Step 1, carry out the test of outdoor scene: in outdoor actual TD-LTE network environment, SINR and RSRP on terminal test and statistics drive test transmission line, and with setting cycle sample with store sample value after, send computer to and process;
Step 2, generates channel files: write the channel files that channel simulator is carried out, the noise for control channel simulator to the decay of transmitted signal and interpolation;
Step 3, connecting test equipment: the difference configuration according to antenna for base station, adopt corresponding equipment connection mode, set up indoor test scene;
Step 4, carries out test and the contrast verification of indoor and outdoor scene: utilize the indoor test environment of the virtual drive test of the simulation outdoor scene that step 3 builds, carry out each performance test project of the inside and outside scrnario testing of terminal room, and carry out contrast verification.
Innovative characteristics and the beneficial effect of the inventive method are:
(1) the virtual road measuring method of the present invention can be at lab simulation drive test terminal the test performance at outdoor scene, can greatly save human and material resources and time cost.
(2) the channel model modeling that traditional indoor performance test adopts is to derive and protocol model based on theory, its test result can not the correlated performance of GC group connector in outdoor scene network, particularly, on special test route, there is larger difference in indoor test and field testing the possibility of result.The virtual road measuring method method of the present invention is the data at outdoor scene collection in worksite based on drive test terminal, can truly reflect communication environments and the network coverage on test route, make the test result in test result closing to reality outfield, for Terminal Design and network performance evaluation provide more accurate method.
(3) circumstance complication of outdoor scene test is changeable, the factors such as the weather of testing location, road, vehicle all can affect test result, therefore the test of outdoor scene is difficult to reproduce, even if the transmission route of twice test, time are all identical, its test result also can be variant.And using the virtual road measuring method of the present invention, channel simulator is problematic part in playback terminal test repeatedly, helps terminal to locate fast the problem of existence, to promote its performance.
Accompanying drawing explanation
Fig. 1 is that the present invention is for the method operating procedure flow chart of the simulation drive test of TD-LTE system.
Fig. 2 is the indoor test scene schematic diagrames of 8 antennas of TD-LTE base station while adopting cross polarizations configuration: 4 physical ports that are positioned in same polarised direction close behind road, input channel simulator, then by the major and minor antenna of channel simulator input test terminal.
Fig. 3 is the indoor test scene schematic diagrames of 8 antennas of TD-LTE base station while adopting the configuration of equipolarization directions: 8 port signals of base station radio-frequency output close behind road, via splitter, be divided into two-way input channel simulator, then by channel simulator output, connected the major and minor antenna of terminal.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing and emulation embodiment, implementation process of the present invention and performance evaluation are described in further detail.
The present invention for the simulation road measuring method of TD-LTE system is: first in actual TD-LTE network environment, use the key parameter on drive test terminal test and statistics drive test transmission line: letter is dry than the received power RSRP of SINR and reference signal, and samples and store sample value with setting cycle.Due to the restriction of interface rate, drive test terminal is transferred to computer by store sample value, and by computer, data is processed, and the minimum period that can identify, fills up two RSRP and SINR between sampled point with channel simulator.Computer is processed the sampled value receiving: the minimum period that can identify with channel simulator, fill up after two RSRP and SINR between sampled value, and import and be connected to the channel simulator between indoor base station and terminal; Again at the indoor environment that completes simulation outfield actual transmissions route: add noise in channel simulator, make through the signal SINR of channel simulator identical with variation tendency or close with the numerical value of the actual signal SINR recording in outfield; Again according to the received power of reference signal, the power of control channel simulator output signal, makes terminal same or similar at the RSRP of the indoor downstream signal by channel simulator and RSRP and the SINR of SINR and its downstream signal that receive at outdoor scene, experience propagation loss.Therefore, terminal just can be accessed and the similar performance in outfield at indoor test.
Referring to Fig. 1, specifically introduce the following operating procedure of the inventive method:
Step 1, carry out the network test of outdoor scene: in outdoor actual TD-LTE Internet communication environment, SINR and RSRP on terminal test and statistics drive test transmission line, and with setting cycle sample with store sample value after, send computer to and process.This step 1 comprises following content of operation:
(11), in the actual TD-LTE Internet communication in the open air of testing environment, design drive test transmission line, makes this transmission line at least comprise three scenes that signal is strong, neutralization is poor.
(12) connect drive test terminal and drive test computer, by drive test terminal initiating business request, access TD-LTE network; Drive test terminal is carried out service downloading on setting transmission line, and calculates and add up at each the transmitting time cycle T TI setting SINR and the RSRP that receives signal.Wherein, SINR for TD-LTE multi-antenna transmission pattern 2 and mode 3, surveying record Shi community public reference signal CRS(Cell Reference Signal); For multi-antenna mode 7, pattern 8 and pattern 9, surveying record be user's DRS (Dedicated Reference Signal) DRS(Dedicated Reference Signal).
(13), because the transmission rate of interface between the processing capacity of terminal chip and terminal and test computer is all limited, therefore carry out after Sampling SINR and RSRP according to setting cycle test terminal, then pass to drive test computer; And SINR that drive test connecting computer receives and the sample value data of RSRP are set to be respectively
with
wherein, subscript 0 represents that this numerical value is crude sampling value; Natural number subscript i is sample value sequence number, and its maximum is K; Two crude sampling value parameters
between sample time interval be T sampling period.
Step 2, generates channel files: write the channel files that channel simulator is carried out, the noise for control channel simulator to the decay of transmitted signal and interpolation.This step comprises following content of operation:
(21) the minimum recognition cycle that channel simulator is set is t, for drive test terminal, between SINR and any two the continuous primary sample values of RSRP, needs to supplement
individual sampled value; In formula,
represent to round downwards; And work as
between n the SINR sampled value of supplementing
time, through the SINR sampled value set omega after interpolation expansion
γfor:
Wherein, natural number n is for supplementing sampled value sequence number, and its maximum is
(22) identical with step (21), when
between n the RSRP sampled value of supplementing
time, through the RSRP sampled value set omega after interpolation expansion
pfor:
(23), because in the OFDM symbol (category-B symbol) that contains pilot tone, data and pilot tone account for respectively M and N subcarrier, therefore for
the output signal power of channel simulator is:
(24) for guaranteeing that the SINR of channel simulator output is consistent with the SINR of drive test terminal in outdoor scene test, in the time of need to increasing at the output of channel simulator, become and obedience average into 0, variance equals Ω
nthe additivity additive white Gaussian AWGN of normal distribution, this AWGN noise power set omega
nfor:
And for arbitrarily
(25) according to above-mentioned power output and noise power, write the executable channel files of channel simulator, during for playback in channel simulator, the noise of control channel simulator to the decay of transmitted signal and interpolation.
Because the transmit port number of TD-LTE system is all greater than 1 conventionally, so for each transmit port, all will gather SINR and RSRP and determine through interpolation processing SINR set and noise set, as the executable file of channel simulator according to abovementioned steps 1.
Step 3, connecting test equipment: the difference configuration according to antenna for base station, adopt corresponding equipment connection mode, set up indoor test scene.This step comprises following content of operation:
(31) if when 8 antennas of TD-LTE base station adopt cross polarization configuration, 4 physical ports that are positioned in same polarised direction are closed behind road, input channel simulator, then by the major and minor antenna (as shown in Figure 2) of channel simulator input test terminal.Or
(32) if when 8 antennas of TD-LTE base station use the configuration of equipolarization direction, 8 port signals of base station radio-frequency output are closed behind road, via splitter, be divided into two-way input channel simulator, then by channel simulator output, connected the major and minor antenna (as shown in Figure 3) of terminal.
(33) in the channel simulator that down link and up link are passed through, add respectively the channel files that step 2 generates simultaneously, and when two channel simulators of operation up channel file and down channel file, must guarantee the heterogeneite of clock synchronous and up-downgoing channel; So just complete the establishment of indoor test scene.
Step 4, carries out test and the contrast verification of indoor and outdoor scene: utilize the indoor test environment of the virtual drive test of the simulation outdoor scene that step 3 builds, carry out each performance test project of the inside and outside scrnario testing of terminal room, and carry out contrast verification.This step comprises following content of operation:
(41) first carry out and complete test terminal in the performance test of indoor scene;
(42) utilize the virtual drive test indoor test environment of the simulation outdoor scene that step 3 builds, test terminal is carried out to the test in simulation outfield; Concrete test event at least comprises: average throughput, transmission accuracy, SINR and RSRP;
(43) test result of above-mentioned two step indoor and outdoor scenes is compared and verified;
(44), to above-mentioned underproof test event, the channel response when this defective index of channel simulator repeat playing being set occurring, so that the problem that reproduction test terminal exists, is conducive to improve and improves terminal capabilities.
The present invention has carried out repeatedly implementing test, and the result of test is successfully, has realized goal of the invention.
Claims (5)
1. the method for the simulation drive test of time division duplex-Long Term Evolution TD-LTE system, it is characterized in that: first in actual TD-LTE network environment, use the letter on drive test terminal test and statistics drive test transmission line dry than the received power RSRP of SINR and reference signal, and with setting cycle sample and store sample value after, then pass to computer; Computer is processed the sampled value receiving: the minimum period that can identify with channel simulator, fill up after two RSRP and SINR between sampled value, and import and be connected to the channel simulator between indoor base station and terminal; Again at the indoor environment that completes simulation outfield actual transmissions route: add noise in channel simulator, make through the signal SINR of channel simulator identical with variation tendency or close with the numerical value of the actual signal SINR recording in outfield; According to the received power of reference signal, the power of control channel simulator output signal, makes terminal just can access identical with field testing or akin performance at indoor test again; Described method comprises following operating procedure:
Step 1, carry out the test of outdoor road scape: in outdoor actual TD-LTE network environment, SINR and RSRP on terminal test and statistics drive test transmission line, and with setting cycle sample with store sample value after, send computer to and process;
Step 2, generates channel files: write the channel files that channel simulator is carried out, the noise for control channel simulator to the decay of transmitted signal and interpolation;
Step 3, connecting test equipment: the difference configuration according to antenna for base station, adopt corresponding equipment connection mode, set up indoor test scene;
Step 4, carries out test and the contrast verification of indoor and outdoor scene: utilize the indoor test environment of the virtual drive test of the simulation outdoor scene that step 3 builds, carry out each performance test project of the inside and outside scrnario testing of terminal room, and carry out contrast verification.
2. method according to claim 1, is characterized in that: described step 1 comprises following content of operation:
(11), in the actual TD-LTE Internet communication in the open air of testing environment, design drive test transmission line, makes this transmission line at least comprise three scenes that signal is strong, neutralization is poor;
(12) connect drive test terminal and drive test computer, by drive test terminal initiating business request, access TD-LTE network; Drive test terminal is carried out service downloading on setting transmission line, and calculates and add up at each the transmitting time TTI setting SINR and the RSRP that receives signal;
(13), because the transmission rate of interface between terminal chip processing capacity and terminal and test computer is all limited, therefore carry out after Sampling SINR and RSRP according to setting cycle test terminal, then pass to drive test computer; And SINR that drive test connecting computer receives and the sample value data of RSRP are set to be respectively
with
wherein, subscript 0 represents that this numerical value is crude sampling value; Natural number subscript i is sample value sequence number, and its maximum is K; Two crude sampling value parameters
between sample time interval be T sampling period.
3. method according to claim 1, is characterized in that: described step 2 comprises following content of operation:
(21) the minimum recognition cycle that channel simulator is set is t, for drive test terminal, between SINR and any two the continuous primary sample values of RSRP, needs to supplement
individual sampled value; In formula,
represent to round downwards; And work as
between n the SINR sampled value of supplementing
time, through the SINR sampled value set omega after interpolation expansion
γfor:
Wherein, natural number n is for supplementing sampled value sequence number, and its maximum is
(22) identical with step (21), when
between n the RSRP sampled value of supplementing
time, through the RSRP sampled value set omega after interpolation expansion
pfor:
(23), because in the OFDM symbol that contains pilot tone, data and pilot tone account for respectively M and N subcarrier, therefore for
the output signal power of channel simulator is:
in formula, ρ
bindicate pilot tone OFDM symbol, be the data subcarrier power of category-B symbol and the ratio of pilot sub-carrier power, its numerical value is that base station presets, unit is dB; The output signal power set omega of channel simulator
qfor:
(24) in order to guarantee that SINR and the drive test terminal of channel simulator output is consistent at the SINR of field testing, in the time of need to increasing at the output of channel simulator, become and obedience average into 0, variance equals Ω
nthe additivity additive white Gaussian AWGN of normal distribution, this AWGN noise power set omega
nfor:
And for arbitrarily
(25) according to above-mentioned power output and noise power, write the executable channel files of channel simulator, during for playback in channel simulator, the noise of control channel simulator to the decay of transmitted signal and interpolation.
4. method according to claim 1, is characterized in that: described step 3 comprises following content of operation:
(31) if when 8 antennas of TD-LTE base station adopt cross polarizations configuration, 4 physical ports that are positioned in same polarised direction are closed behind road, input channel simulator, then by the major and minor antenna of channel simulator input test terminal; Or
(32) if when 8 antennas of TD-LTE base station use the configuration of equipolarization direction, 8 port signals of base station radio-frequency output are closed behind road, via splitter, be divided into two-way input channel simulator, then by channel simulator output, connected the major and minor antenna of terminal;
(33) in the channel simulator that down link and up link are passed through, add respectively the channel files that step 2 generates simultaneously, and when two channel simulators of operation up channel file and down channel file, must guarantee the heterogeneite of clock synchronous and up-downgoing channel; So just complete the establishment of indoor test scene.
5. method according to claim 1, is characterized in that: described step 4 comprises following content of operation:
(41) first carry out and complete test terminal in the performance test of indoor scene;
(42) utilize the virtual drive test indoor test environment of the simulation outdoor scene that step 3 builds, test terminal is carried out to the test in simulation outfield; Concrete test event comprises: average throughput, transmission accuracy, SINR and RSRP;
(43) test result of above-mentioned two step indoor and outdoor scenes is compared and verified;
(44), to above-mentioned underproof test event, the channel response when this defective index of channel simulator repeat playing being set occurring, so that the problem that reproduction test terminal exists, is conducive to improve and improves terminal capabilities.
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| CN111200828B (en) * | 2018-11-20 | 2023-12-29 | 中兴通讯股份有限公司 | Dynamic sampling method for drive test data |
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| CN112134592A (en) * | 2020-09-24 | 2020-12-25 | Oppo（重庆）智能科技有限公司 | Radio frequency circuit and electronic device |
| WO2023005746A1 (en) * | 2021-07-26 | 2023-02-02 | 中兴通讯股份有限公司 | Channel modeling method and apparatus, storage medium, and electronic apparatus |
| CN115733774A (en) * | 2021-08-30 | 2023-03-03 | 深圳市万普拉斯科技有限公司 | Throughput testing method and device and master control equipment |
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