CN102595447A - Method and device for wireless measuring sensitivity of base station - Google Patents
Method and device for wireless measuring sensitivity of base station Download PDFInfo
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- CN102595447A CN102595447A CN2012100436524A CN201210043652A CN102595447A CN 102595447 A CN102595447 A CN 102595447A CN 2012100436524 A CN2012100436524 A CN 2012100436524A CN 201210043652 A CN201210043652 A CN 201210043652A CN 102595447 A CN102595447 A CN 102595447A
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Abstract
The invention discloses a method and a device for wireless measuring a sensitivity of a base station. The invention has the technical points of detecting the information channel of a detected base station; on one information channel of the list, changing the transmitting power of a test terminal 1 through a power regulator and counting the error rate on a test terminal 2; obtaining the received power of the base station corresponding to the test terminal to be used as the sensitivity of the base station on the information channel by using the corresponding transmitting power of the test terminal 1 under a setting error rate and the transmission performance of the wireless channel. According to the measure to the sensitivity of the base station realized by adopting the wireless way, the defect of the cable connection measuring sensitivity is effectively solved, for example, the base station antenna erected on a high mountain is difficult to connect through the incoming of wired lines, meanwhile, the normal operation of the base station cannot be affected by the measuring method provided by the invention, therefore, the method and the device have wide application prospect in the market.
Description
Technical field
The present invention relates to communication technical field, especially a kind of wireless channel is measured base station sensitivity of method and device down.
Background technology
In the wireless communication system, the performance of base station receiver is most important.And sensitivity is the important indicator of weighing the base station receiver performance.What its reflected is the ability that base station receiver receives small-signal.Base station sensitivity not only can influence the quality of network, can also influence the covering and the capacity of network.The measurement of base station sensitivity has very important meaning.
Existing base station receiving sensitivity test macro is to adopt wired mode to measure.Like Fig. 1 sketch map the example that this wired mode is measured base station sensitivity has been shown; First test terminal 11 is connected with the high frequency radio output of base station 5 with cable through directional coupler 13, and wherein, base station 5 comprises duplexer 6; Radiating portion 7, receiving unit 8.Be connected to directional coupler 13 from the radio signal of first test terminal, 1 output through coupler 2, the first attenuators 12.Also be connected to power measurement instruments from the radio signal of first test terminal, 1 output through coupler 2, the second attenuators 12.Through measurement, just can go out performance number like this according to the attenuation indirect calculation of coupling coefficient and circuit through the radio signal of directional coupler 13 entering base stations to power measurement instruments.Under the power control of base station, this signal power is exactly the base station receiving sensitivity.
Above-mentioned base station receiving sensitivity test macro sees MTI Co., Ltd. for details in the patent of on March 24th, 2003 application " measurement has the method for receiving sensitivity of the base station of a plurality of Frequency Distribution " (patent No.: 03121077.5).This test macro accuracy is high, but will influence the normal operation of base station, and needs base station power control to cooperate, and Sensitirity va1ue measured when breaking down in the base station is unreliable.
Summary of the invention
The present invention provides and measures base station sensitivity of method and device under a kind of wireless channel.Adopt the present invention, test macro does not influence the normal operation of base station.Simultaneously, test macro need not the power control of base station end, still can obtain reliable Sensitirity va1ue under this situation about breaking down in the base station, in time reflects the problem of base station.
The technical scheme that the present invention adopts is: measure the base station sensitivity of method on the wireless channel, implementation step comprises:
Step 1: available channel is selected in first test terminal, on said channel, connects with second test terminal;
Step 2: on the reverse link of first test terminal and base station to be measured, change the transmitting power of first test terminal through power governor;
Step 3: prestore standard signal on second test terminal; Said standard signal is identical with the signal of first test terminal emission; Second test terminal receives signal; And detect to receive the error rate or the FER of signal according to standard signal; Utilize the error rate or FER to extrapolate the received power
of base station, as base station sensitivity corresponding to first test terminal in the transmitting power
of the first corresponding test terminal of a certain threshold values.
Preferably; The base station is corresponding to the received power
of first test terminal, and wherein
is that antenna gain,
of first test terminal are the wireless channel loss value for bs antenna gain,
.
Preferably, the base station is corresponding to the received power
of first test terminal 1;
Wherein
is the gain of base station reception antenna on the transmitting antenna direction of first test terminal;
,
are respectively base station and the first test terminal transmitting antenna axially at the angle of vertical direction and horizontal direction;
is the gain of transmitting antenna on the reception antenna direction of base station of first test terminal;
,
are respectively first test terminal and base station transmit antennas axially at the angle of vertical direction and horizontal direction;
is the wavelength that transmits;
is the distance of the transmitting antenna and the base station reception antenna of first test terminal.
Preferably, the error rate or FER threshold values is chosen as the setting corresponding to particular logical channel under static state or the multipath transmisstion condition.
Preferably, said base station is GSM base station, IS-95 base station, TD-SCDMA base station, CDMA2000 base station, WCDMA base station or reaches the LTE base station that the signal under first test terminal and second test terminal transmitting-receiving corresponding system is to measure the sensitivity of respective base station.
Preferably; The signal output part of first test terminal 1 is connected with the signal input part of power distributing unit 2; The signal input part of one road signal ingoing power adjuster of power distributing unit 2 outputs, the signal output part of power governor links to each other with the transmitting antenna 10 of first test terminal; Another road signal ingoing power measuring instrument 4 of said power distributing unit 2 outputs.
Preferably; The measuring method of the transmitting power of said first test terminal 1
is: the performance number of power measurement instruments 4 being measured according to the power division ratio coefficient of power distributing unit is converted into the performance number that signal gets into said power governor, and the transmitting power of first test terminal 1
deducts the power adjustments amount of said power governor and the numerical value after the device insertion waste (like the waste of feeder line) for the performance number that gets into said power governor.
Measure the device of base station sensitivity on the wireless channel, comprise first test terminal 1, second test terminal 9; First test terminal 1 and second test terminal 9 are positioned at the communication range of base station 5 to be measured, and both all set up communication through base station 5 to be measured;
Wherein the signal output part of first test terminal 1 is connected with the signal input part of power distributing unit 2; The signal input part of one road signal ingoing power adjuster of power distributing unit 2 outputs, the signal output part of power governor links to each other with the transmitting antenna 10 of first test terminal 1; Another road signal ingoing power measuring instrument 4 of said power distributing unit 2 outputs;
Prestore standard signal on said second test terminal 9, said standard signal is identical with the signal of first test terminal, 1 emission, and second test terminal 9 is used to receive signal, and detects the error rate or the FER that receives signal according to standard signal.
Preferably, said first test terminal 1 also has signal with controller 11 and is connected, and said controller 11 is used to control first test terminal 11 to be tested on certain channel to be measured; Said power governor is a numerical-control attenuator 3.
Preferably, first test terminal 1 and second test terminal 9 integrate and form the duplex wireless communication module.
The wireless channel that the present invention proposes is measured base station sensitivity of method and device down, can not influence the normal operation of base station.Simultaneously, test macro need not the power control of base station end, still can obtain reliable Sensitirity va1ue under this situation about breaking down in the base station, can in time reflect the problem of base station.The present invention has solved the deficiency of wired measuring effectively, has wide market application prospect.
Description of drawings
Fig. 1 sketch map has illustrated an example of the conventionally test structure that is used to measure the base station receiving sensitivity.
Fig. 2 sketch map has illustrated an example that is used for communication system block diagram of the present invention.
Fig. 3 sketch map has illustrated according to the said a kind of structure of accepting sensitivity that is used for testing base station of one embodiment of the invention.
Fig. 4 flow chart shows according to the said flow process that is used to measure the receiving sensitivity of base station of one embodiment of the invention.
Fig. 5 sketch map has illustrated the directional diagram of transmitting antenna and reception antenna.
Mark among the figure: 1 is first test terminal, and 2 is power distributing unit, and 3 is numerical-control attenuator, and 4 is power measurement instruments; 5 is the base station, and 6 is base station duplexer, and 7 is radiating portion, and 8 is receiving unit; 9 is second test terminal, and 10 is the first test terminal transmitting antenna, and 11 is controller, and 12 is first attenuator; 13 is the directive overrurrent relay allocation units, and 14 is the second test terminal reception antenna, and 15 is antenna for base station; 20,21 is travelling carriage, and 22 is the forward link signal that send base station 5, and 23 is the reverse link signal that travelling carriage 20 sends, and 24 is the reverse link signal that travelling carriage 21 sends.
Embodiment:
Provide embodiment of the present invention below.The sketch map of Fig. 2 has illustrated the communication system block diagram of a specific embodiment of the present invention.Base station 5 is set up on the uplink and downlink wireless channel with travelling carriage 20,21 and is communicated by letter.
Adopt the performing step of base station sensitivity measuring method among the present invention to be:
1. available channel is selected in first test terminal 11, on said channel, makes a call to second test terminal 9;
2. on the reverse link of first test terminal 11 and base station to be measured, change the transmitting power of first test terminal 11 through power governor;
3. detect the error rate on second test terminal 9, utilize the received power of the error rate, as base station sensitivity in the transmitting power release base station of the first corresponding test terminal 11 of a certain threshold values.Simultaneously, the power control of base station is not participated in first test terminal 11, uses power governor to change the transmitting power at said terminal.And the selection of error rate threshold values can be corresponding to the setting of particular logical channel under static state or the multipath transmisstion condition (when the error rate is worth greater than this, think can not proper communication).
Generally speaking; During wireless path was propagated, antenna for base station received power
can obtain through antenna transmitting power
, the first test terminal transmitter antenna gain (dBi)
, base station receiving antenna gain
, wireless path propagation loss
:
In the present invention;
is the antenna transmitting power of first test terminal 11 under the specific bit error rate;
is the transmitter antenna gain (dBi) of first test terminal 11;
is the base station receiving antenna gain;
is the wireless channel loss of the base station and first test terminal 11, with the sensitivity of the antenna for base station received power that records
as the base station.
The sketch map of Fig. 3 has illustrated according to the said a kind of circuit structure that is used for the receiving sensitivity of testing base station of one embodiment of the invention.The power control of base station, the base station receiving sensitivity under the measure static transmission conditions are not participated in the terminal.First test terminal 11 links to each other with the first test terminal transmitting antenna 10 through power distributing unit 2, power governor (specifically can be numerical-control attenuator 3).Simultaneously, first test terminal 11 links to each other with power measurement instruments 1 through power distributing unit 2.Controller 11 controls first test terminal 11 is tested on certain channel to be measured.
Prestore standard signal on said second test terminal 9, said standard signal is identical with the signal of first test terminal, 1 emission, and second test terminal 9 is used to receive signal, and detects the error rate or the FER that receives signal according to standard signal.
Conversation is set up with second test terminal 9 in the test terminal on said wireless channel.Can adjust the transmitting power that first test terminal 1 arrives antenna 10 through numerical-control attenuator 3, but the test result indirect calculation of this transmitting power feed-through power meter is come out.When increasing decay, the error rate that counts on second test terminal 9 can rise.When the error rate reached 2%, the transmitting power of first test terminal 1 of this moment just can be used to extrapolate the received power that arrives the base station, as the receiving sensitivity of base station.
Another specific embodiment of base station sensitivity measuring method is among the present invention:
The far field test is satisfied in the selection of local test point, has the requirement in direct projection path.Suppose the three-dimensional geographical coordinate of known base station and test point; The directional diagram of test point antenna pattern and antenna for base station; Emission signal frequency.Like Fig. 4.
At first, the available channel (step S1) of tested base station is scanned in first test terminal 1, and is chosen in foundation conversation on certain channel through controller, measures (step S2).
Then, add up the error rate (step S4) on second test terminal 9.When the error rate less than 2% the time, further reduce the ascending power (step S3) of first test terminal 1 through numerical-control attenuator, and second test terminal 9 is added up the error rate again.The adjustment numerical-control attenuator until the error rate greater than 2%.Utilizing the error rate is the transmitting power of 2% o'clock first test terminal 1, extrapolates this moment base station corresponding to the received power (step S3) of first test terminal 1.Under the test scene in said present embodiment, can calculate the received power
of antenna according to Fu Lisi (Friis) transmission formula in the free space Line-of-Sight Propagation Model:
Wherein
is the antenna transmitting power of 2% o'clock first test terminal 1 for the error rate;
is the gain of base station reception antenna on the transmitting antenna direction of first test terminal 1;
is the gain of transmitting antenna on the reception antenna direction of base station of first test terminal 1;
is the wavelength that transmits,
be the distance (referring to Fig. 5) of the transmitting antenna and the base station reception antenna of first test terminal 1.
Suppose that the base station three-dimensional coordinate is
; First test terminal, 1 three-dimensional coordinate is
; And the antenna of the base station and first test terminal 1 all adopts half-wave dipole antenna; Polarization mode is identical; Do not consider antenna lower decline and mechanical tilt, then
Wherein,
,
In structure shown in Figure 3 20; When the error rate is 2%; The signal power of releasing according to the power division ratio coefficient of power distributing unit 2 through power measurement instruments 4 behind numerical-control attenuator 3 is
; The insertion fissipation factor that feeder line (connecting antenna 10 and numerical-control attenuator 3) is introduced is
; Then in antenna and feed line impedance coupling; Under the antenna efficiency
, the antenna for base station received power:
Need to prove that power division ratio coefficient is the watt level ratio of power distributing unit port one and port 2.Among the present invention; Power distributing unit has a signal input; Two signal outputs; Be power distributing unit port one and port 2, power measurement instruments 4, numerical-control attenuator 3 correspondences are connected with port 2 with the power distributing unit port one, and power measurement instruments 4 multiply by the signal power size that power division ratio coefficient just can obtain getting into numerical-control attenuator 3 with its signal power that receives.
Above-mentioned method of testing and device can be used for the measurement that sensitivity is accepted in GSM base station, IS-95 base station, TD-SCDMA base station, CDMA2000 base station, LTE base station, WCDMA base station etc.; Signal under first test terminal 11 and second test terminal, the 9 transmitting-receiving corresponding systems is to measure the sensitivity of respective base station.
Invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (10)
1. measure the base station sensitivity of method on the wireless channel, implementation step comprises:
Step 1: available channel is selected in first test terminal, on said channel, connects with second test terminal;
Step 2: on the reverse link of first test terminal and base station to be measured, change the transmitting power of first test terminal through power governor;
Step 3: prestore standard signal on second test terminal; Said standard signal is identical with the signal of first test terminal emission; Second test terminal receives signal; And detect to receive the error rate or the FER of signal according to standard signal; Utilize the error rate or FER to extrapolate the received power
of base station, as base station sensitivity corresponding to first test terminal in the transmitting power
of the first corresponding test terminal of a certain threshold values.
2. method according to claim 1; It is characterized in that; The base station is corresponding to the received power
of first test terminal, and wherein
is that antenna gain,
of first test terminal are the wireless channel loss value for bs antenna gain,
.
3. method according to claim 1; It is characterized in that the base station is corresponding to the received power
of first test terminal (1);
Wherein
is the gain of base station reception antenna on the transmitting antenna direction of first test terminal;
,
are respectively base station and the first test terminal transmitting antenna axially at the angle of vertical direction and horizontal direction;
is the gain of transmitting antenna on the reception antenna direction of base station of first test terminal;
,
are respectively first test terminal and base station transmit antennas axially at the angle of vertical direction and horizontal direction;
is the wavelength that transmits;
is the distance of the transmitting antenna and the base station reception antenna of first test terminal.
4. according to claim 1 or 2 or 3 described methods, it is characterized in that, the error rate or FER threshold values be chosen as setting corresponding to particular logical channel under static state or the multipath transmisstion condition.
5. method according to claim 4; It is characterized in that; Said base station is GSM base station, IS-95 base station, TD-SCDMA base station, CDMA2000 base station, WCDMA base station or reaches the LTE base station; Signal under first test terminal and second test terminal transmitting-receiving corresponding system is to measure the sensitivity of respective base station.
6. method according to claim 5; It is characterized in that; The signal output part of first test terminal (1) is connected with the signal input part of power distributing unit (2); The signal input part of one road signal ingoing power adjuster of power distributing unit (2) output, the signal output part of power governor links to each other with the transmitting antenna (10) of first test terminal; Another road signal ingoing power measuring instrument (4) of said power distributing unit (2) output.
7. method according to claim 6; It is characterized in that; The measuring method of the transmitting power of said first test terminal (1)
is: the performance number of power measurement instruments (4) being measured according to the power division ratio coefficient of power distributing unit is converted into the performance number that signal gets into said power governor, and the transmitting power of first test terminal (1)
deducts the power adjustments amount of said power governor and the numerical value after the device insertion waste for the performance number that gets into said power governor.
8. measure the device of base station sensitivity on the wireless channel, it is characterized in that, comprise first test terminal (1), second test terminal (9); First test terminal (1) and second test terminal (9) are positioned at the communication range of base station to be measured (5), and both all set up communication through base station to be measured (5);
Wherein the signal output part of first test terminal (1) is connected with the signal input part of power distributing unit (2); The signal input part of one road signal ingoing power adjuster of power distributing unit (2) output, the signal output part of power governor links to each other with the transmitting antenna (10) of first test terminal (1); Another road signal ingoing power measuring instrument (4) of said power distributing unit (2) output;
Prestore standard signal on said second test terminal (9), said standard signal is identical with the signal of first test terminal (1) emission, and second test terminal (9) are used to receive signal, and detect the error rate or the FER that receives signal according to standard signal.
9. measure the device of base station sensitivity on the wireless channel according to claim 8; It is characterized in that; Said first test terminal (1) also has signal with controller (11) and is connected, and said controller (11) is used to control first test terminal (11) to be tested on certain channel to be measured; Said power governor is numerical-control attenuator (3).
10. measure the device of base station sensitivity on the wireless channel according to claim 9, it is characterized in that, first test terminal (1) integrates with second test terminal (9) and forms the duplex wireless communication module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114024882A (en) * | 2021-09-23 | 2022-02-08 | 深圳市共进电子股份有限公司 | Router performance test method, device, system and storage medium |
| CN115833973A (en) * | 2022-11-03 | 2023-03-21 | 深圳市共进电子股份有限公司 | Performance test method and device of wireless access point, terminal equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114024882A (en) * | 2021-09-23 | 2022-02-08 | 深圳市共进电子股份有限公司 | Router performance test method, device, system and storage medium |
| CN115833973A (en) * | 2022-11-03 | 2023-03-21 | 深圳市共进电子股份有限公司 | Performance test method and device of wireless access point, terminal equipment and storage medium |
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| CN102595447B (en) | 2015-05-13 |
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