CN101431766B - Test method for bit error rate of UE under TDD mode in high-speed motion state - Google Patents
Test method for bit error rate of UE under TDD mode in high-speed motion state Download PDFInfo
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- CN101431766B CN101431766B CN2007101699598A CN200710169959A CN101431766B CN 101431766 B CN101431766 B CN 101431766B CN 2007101699598 A CN2007101699598 A CN 2007101699598A CN 200710169959 A CN200710169959 A CN 200710169959A CN 101431766 B CN101431766 B CN 101431766B
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Abstract
This invention provides an error code ratio testing method of UE in a motive state of high speed under TDD mode, comprising: setting a test environment parameter and frequency; using a system simulator, a noise source, a reduction emulator and a UE to install a testing link; installing a calling connection and making the terminal enter to the testing mode; setting the reduction emulator as the motive state of high speed; and measuring the error code ration of DCH channel. The error code ratio of the UE in motive state of high speed can be acquired, thereby making the terminal design manufacturing company be capable of optimizing the terminal performance based on the accurate error code ratio.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the test method for bit error rate of UE (portable terminal) under high-speed motion state under a kind of TDD (time division duplex) pattern.
Background technology
New business such as surfing Internet with cell phone that progressively develops recently and mobile TV make the portable terminal portable terminal except basic call function is met consumers' demand, and develop into people's daily life necessary tool just gradually.Particularly on the road, in the way on and off duty, portable terminal will become people and obtain information and amusement instrument the most easily; Also having the GPS of portable terminal professional, also will be the function of the indispensability in the driving way.All these portable terminals of having derived are in a kind of extensive use of new scene, and that is exactly the application in high-speed train, high speed car or magnetic suspension train.
When move with certain speed v in the terminal; Because the existence of Doppler (Doppler) effect will produce certain influence to the frequency at terminal, causes the skew of centre frequency; Thereby because the deviation of frequency causes the raising of the error rate, influence the performance of system at receiving terminal.Particularly when speed ratio is bigger, the skew of frequency will be bigger, and will be also just bigger to the influence of systematic function, to a certain degree influencing data transmission quality.
Can keep enough stability when under along with the state of high-speed motions such as high-speed train, high speed car or magnetic suspension train, realizing miscellaneous service in order to ensure portable terminal; Must accurately predict its transmission performance; Test is some important parameter wherein, just can find the method that improves its performance.
Summary of the invention
In view of the foregoing, the present invention's technical problem that will solve provides the test method for bit error rate of UE under high-speed motion state under a kind of tdd mode.
The test method for bit error rate of UE under high-speed motion state under a kind of tdd mode may further comprise the steps:
Test environment parameter and frequency are set;
Using system simulator, noise source, reduction emulator and UE set up test link;
Set up and call out connection, and make the terminal get into test pattern;
It is high-speed motion state that reduction emulator is set; And
Measure the error rate of DCH channel.
Wherein, the parameters in the said calling need be followed the requirement of required test channel, to corresponding spreading rate, selects corresponding transmission rate.
Wherein, said test pattern is loopback mode or Ack/Nack test pattern.
Wherein, said foundation is called out and is connected, and the terminal is got in the step of test pattern, and the UE initial condition should be arranged on general radio frequency testing state, and the test handset card should be inserted among the UE.
Wherein, also comprise synthesizer in the said test link, in order to future the self damping simulator and from the two-way of noise source input synthesizes one the tunnel and exports to UE.
Wherein, The signal of said system simulator output is after reduction emulator output; Noise signal with the noise source simulation gets into synthesizer, synthesizes one the tunnel through synthesizer and exports to UE, sends to the receiving terminal of system simulator after the UE output; Signal sends from the transmitting terminal of system simulator again then, thereby forms the loopback of signal.
According to method provided by the present invention, can record the error rate of UE under high-speed motion state, thereby make Terminal Design manufacturer can optimize the performance at terminal according to bit error rate information accurately.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become apparent, perhaps understand by embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.
In the accompanying drawings:
Fig. 1 is the test link figure of method of testing of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
UE may further comprise the steps in the method for testing of the high-speed motion state error rate under a kind of tdd mode:
1. test environment parameter and frequency are set.
The test environment parameter here comprises temperature and voltage etc.When under following temperature conditions, testing, UE should be in normal operating conditions:
General temperature conditions is :+15 ℃ to+35 ℃ (relative humidity is 25% to 75%)
Special temperature conditions is :-10 ℃ to+55 ℃.
That is to say that in the ordinary course of things, the temperature conditions of terminal test is+15 ℃ to+35 ℃.If need the performance of test terminal under specific condition, the scope that temperature then should be set is-10 ℃ to+55 ℃.So test sometimes only needs when low temperature (10 ℃) and high temperature (+55 ℃), to carry out.
More than be general temperature setting, the temperature conditions that UE test needs to satisfy under some special environment is as the criterion with the standard of different areas and different operator.
For the alternating voltage in when test, each manufacturer all should be when UE dispatches from the factory regulation ceiling voltage (H) and minimum voltage (L), the extreme voltage when shutting down in addition.Voltage setting in the test should not overshoot value.
For the cell voltage condition, each manufacturer all should be when UE dispatches from the factory regulation ceiling voltage, minimum voltage, nominal voltage and overcurrent protection voltage.Battery for other special occasions uses or special purpose should be followed its distinctive regulation.
Optional frequency band range was following when tdd mode was provided with test frequency:
A) 1900-1920MHz: uplink and downlink transmission
2010-2025MHz uplink and downlink transmission
B) 1850-1910MHz: uplink and downlink transmission
1930-1990MHz: uplink and downlink transmission
C) 1910-1930MHz: uplink and downlink transmission
D) 2570-2620MHz: uplink and downlink transmission
2. set up test link.
Referring to Fig. 1, in the present embodiment, using system simulator, reduction emulator, synthesizer, noise source and UE make up test link.
Base station in the system simulator analog communication links, the noise that produces in the noise source analog communication channel (for the noise that produces at random), synthesizer be self damping simulator and synthesize a tunnel from the two-way input of noise source and export to UE in the future.Transmission signals is after the output of system simulator transmitting terminal; Export through reduction emulator; The output signal gets into synthesizer with the noise signal of noise source simulation, synthesizes one the tunnel through synthesizer and exports to UE, sends to the receiving terminal of system simulator after the UE output; Signal sends from the transmitting terminal of system simulator again then, forms the loopback of signal with this.
3. set up and call out, and the parameters of calling is set.
Set up when calling out and to follow general call setup flow process.The parameter setting of each device in the link should be followed the requirement of various test channel, according to the requirement of every kind of different channels corresponding transmitted data rates is set.
To tdd mode, three kinds of spreading rate: 1.28Mcps are arranged, 3.84Mcps, 7.68Mcps.
When spreading rate was 1.28Mcps or 3.84Mcps, the speed setting of respective channel should be 12.2kbit/s, 64kbit/s, and 144kbit/s, 384kbit/s, and draw the measured value under each speed.
When spreading rate was 7.68Mcps, the speed setting of respective channel should be 12.2kbit/s, and drew the measured value under this speed.
The UE initial condition should be arranged on general radio frequency testing state, and test should be inserted among the UE with usim card (or claiming subscriber identification module or mobile phone card).
4. for UE test pattern is set and makes UE get into this pattern work.
Test pattern should be set to loopback test pattern or Ack/Nack (replying/non-replying) test pattern.
The loopback test pattern helps the diagnostic test of device or equipment.Under the loopback test pattern, transceiver will pass through the other end of the signal of network or one section particular link transmission by an end foldback back equipment of transceiver.To compare from the signal at two ends.Difference between the two helps the tracking of fault.
When being operated in ACK/NACK test pattern following time, after the recipient correctly receives data, can send ACK information to transmit leg through corresponding channel, otherwise send nack message, be convenient to transmit leg like this and accurately and timely understand and whether need to retransmit.
5. it is high-speed motion state that reduction emulator is set.
The attenuation type of reduction emulator analog communication channel, its effect are the frequencies that changes input signal according to the movement velocity at terminal, with variation (decay) state that simulates transmission signals under the high-speed motion state.The movement velocity that is input as UE of reduction emulator is output as the signal after the decay.Path attenuation has its special attribute with the decay difference of UE in other situation under high-speed motion state.The model attributes of high-speed motion state is described below:
The difference of high-speed motion state and other communication channels mainly is the variation of signal spectrum in the high speed.Formula (1) is followed in the skew of frequency spectrum, as follows:
f
s(t)=f
dCos θ (t) formula (1)
F wherein
s(t) be Doppler frequency shift; f
dBe maximum doppler frequency; Shown in the maximum following formula of Doppler frequency displacement (2):
Wherein, c is the light velocity, and unit is a meter per second, and v is the movement velocity of UE, and unit is a meter per second; f
cBe frequency input signal.θ (t) can be expressed as by formula (3):
Wherein, D
s/ 2 expression terminals are with the initial distance of base station, and unit is a rice; D
MinBe the air line distance between base station and the terminal, unit is a rice; T is running time, and unit is second.
Illustrate the situation of change of frequency spectrum below.The parameter of above-mentioned two formula is provided with as follows:
| Parameter | Value |
| D s | 300m |
| D min | 2m |
| v | 300km/h |
| f d | 600Hz |
The scope that draws Doppler frequency shift thus for (600Hz ,+600Hz).
6. measure the error rate of DCH channel.
The DCH channel is special-purpose transmission channel.On the basis based on above-mentioned test environment of setting up and set operating state, select the DCH channel, record its error rate under given conditions.
Claims (4)
1. the test method for bit error rate of UE under high-speed motion state under the tdd mode is characterized in that, may further comprise the steps:
Test environment parameter and frequency are set;
Using system simulator, noise source, reduction emulator and UE set up test link;
Set up and call out connection, and make the terminal get into test pattern, wherein, said test pattern is loopback mode or Ack/Nack test pattern;
It is high-speed motion state that reduction emulator is set; And
Measure the error rate of DCH channel;
Wherein, The signal of said system simulator output is after reduction emulator output; Noise signal with the noise source simulation gets into synthesizer; Synthesize one the tunnel through synthesizer and export to UE, send to the receiving terminal of system simulator after the UE output, signal sends from the transmitting terminal of system simulator again then.
2. method according to claim 1 is characterized in that the parameters in the said calling need be followed the requirement of required test channel, to corresponding spreading rate, selects corresponding transmission rate.
3. method according to claim 1 is characterized in that, also comprises synthesizer in the said test link, in order to future the self damping simulator and from the two-way of noise source input synthesizes one the tunnel and exports to UE.
4. method according to claim 3; It is characterized in that the signal of said system simulator output is after reduction emulator output, the noise signal of simulating with noise source gets into synthesizer; Synthesize one the tunnel through synthesizer and export to UE; Send to the receiving terminal of system simulator after the UE output, signal sends from the transmitting terminal of system simulator again then, thereby forms the loopback of signal.
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| CN102201874A (en) * | 2010-03-22 | 2011-09-28 | 中兴通讯股份有限公司 | System and method for measuring adjacent channel leakage ratio of LTE mobile terminal |
| CN111787560A (en) * | 2020-06-15 | 2020-10-16 | 西安思丹德信息技术有限公司 | Method and system for testing influence of simulated target motion state on wireless communication |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185263A (en) * | 1995-04-03 | 1998-06-17 | 艾利森电话股份有限公司 | Transceiver tester for cellular radio |
| CN101009523A (en) * | 2006-01-23 | 2007-08-01 | 中兴通讯股份有限公司 | A device and method for automatic measurement of the mobile communication terminal demodulation performance |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185263A (en) * | 1995-04-03 | 1998-06-17 | 艾利森电话股份有限公司 | Transceiver tester for cellular radio |
| CN101009523A (en) * | 2006-01-23 | 2007-08-01 | 中兴通讯股份有限公司 | A device and method for automatic measurement of the mobile communication terminal demodulation performance |
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Application publication date: 20090513 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Test method for bit error rate of UE under TDD mode in high-speed motion state Granted publication date: 20120704 License type: Common License Record date: 20151123 |
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