CN107809291A - A kind of TDD and FDD LTE RRU general standing-wave ratio detecting method - Google Patents
A kind of TDD and FDD LTE RRU general standing-wave ratio detecting method Download PDFInfo
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- CN107809291A CN107809291A CN201711092665.XA CN201711092665A CN107809291A CN 107809291 A CN107809291 A CN 107809291A CN 201711092665 A CN201711092665 A CN 201711092665A CN 107809291 A CN107809291 A CN 107809291A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/103—Reflected power, e.g. return loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
Abstract
The invention belongs to mobile communication technology field, discloses a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method, including：Obtain downstream signal and the time delay of preceding reverse link signal；Obtain configuration information, the PBCH signal durations of cyclic prefix；CPU by the switch of feedback link switch to before to；FPGA obtains forward signal；PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read and are converted to forward power value；CPU switches to the switch of feedback link reversely；Similarly obtain backward power value；Obtain return loss value；Value calibration is calibrated according to return loss and obtains actual return loss value；Obtain standing-wave ratio testing result.The present invention can realize TD LTE and FDD LTE RRU standing-wave ratio detection simultaneously, and can ensure the accuracy of detection.
Description
Technical field
The present invention relates to mobile communication technology field, particularly with regard to a kind of TDD and FDD LTE RRU general standing wave
Compare detection method.
Background technology
LTE is by the Long Term Evolution of the 3GPP UMTS technical standards organized to set up, i.e., said 4G.Including TDD (when
Be divided to duplex), two kinds of dual-modes of FDD (FDD).LTE using FDD (FDD) formula is FDD-LTE, fdd mode
The characteristics of be that system is received and transmitted simultaneously on two symmetrical frequency channels of separation, with ensureing that frequency range connects to separate
Receive and transmit channel.The characteristics of tdd mode, is received and is transmitted in different time domain, is received and is transmitted and deposits between time domain
In insulation blocking.
It is as follows to introduce LTE technical field Essential Terms：
1、RRU：Remote RF Unit, Remote Radio Unit
2、LTE：Long Term Evolution, Long Term Evolution plan
3、TD-LTE：Time Division Long Term Evolution, time-division Long Term Evolution
4、FDD-LTE：Frequency Division Duplex Long Term Evolution, FDD are long-term
Evolution
5、GP：Guard Period, protect time slot
6、PBCH：Physical Broadcast Channel, Physical Broadcast Channel
7、VSWR：Voltage Standing Wave Ratio, voltage standing wave ratio
8、RL：Return Loss, return loss
9、CP：Cyclic Prefix, cyclic prefix
More accurately way is to insert to fix in up-downgoing protection time slot GP for TD-LTE RRU standing-wave ratios detection at present
Constant, then calculate standing-wave ratio to, reverser to gather forward power and backward power before switching.Although this method ensure that
The TD-LTE degree of accuracy, but up-downgoing protection time slot is occupied, up-downgoing protection time slot is actually shortened, influences LTE
The service coverage radius of signal.
The detection of FDD-LTE RRU standing-wave ratios more accurately way be by detect forward power and corresponding base band power with
And backward power and corresponding base band power, forward power is obtained relative to base band power yield value and backward power relative to base band
Power gain value, calculate return loss value and carry out standing-wave ratio detection, this method ensure that certain accuracy, by accurately measuring
Time delay can ensure base band power point and forward power collection point and base band power point and the backward power collection point of collection on plate
Corresponding same one piece of data, but particularly have when equipment produce and to deposit onboard delay variation after hardware device correcting and need again
Newly accurately measured, and TD-LTE RRU standing-wave ratios can not be applied to simultaneously and detected.
The content of the invention
The embodiment of the present application solves existing by providing a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method
There is the problem of standing-wave ratio detection that can not realize TD-LTE and FDD-LTE RRU in technology simultaneously.
The embodiment of the present application provides a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method, including following step
Suddenly：
Step 1, downstream signal and the time delay T of preceding reverse link signal are obtaineddl；
Step 2, the configuration information of the cyclic prefix of LTE radio frames is obtained, is obtained according to the configuration information of cyclic prefix
PBCH signal durations TPB；
Step 3, CPU pass through FPGA under signal by the switch of feedback link switch to before to；
Step 4, FPGA is delayed T on the basis of frame headdl+ T1+T2, forward signal is obtained, a length of T3 during data acquisition；
Wherein, T1 is that PBCH signals are delayed relative to frame head, and T2 is collection shift time；
Step 5, PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read
Take and be converted to forward power value PFW；
Step 6, CPU passes through under FPGA to signal and switches to the switch of feedback link reversely；
Step 7, be delayed T on the basis of the header signal in step 4dl+ 10ms+T1+T2, obtains reverse signal, and data are adopted
A length of T3 during collection；
Step 8, with step 5, read and be converted to backward power value PFB；
Step 9, the forward power value and backward power value obtained according to step 5 and step 8, obtains return loss value RL1,
RL1=PFW-PFB；
Step 10, calibrated to obtain actual return loss value RL, RL=RL1+ Δ RL according to return loss calibration value Δ RL；
Step 11, return loss value actual according to obtained by step 10 obtains standing-wave ratio testing result.
Preferably, in step 2, the cyclic prefix is conventional CP or extension CP, conventional CP PBCH signal durations TPBFor
285.43 μ s, extend CP PBCH signal durations TPBFor 333.36 μ s.
Preferably, in step 4 and step 7, T2 >=20 μ s, T3≤TPB-2×T2。
Preferably, in step 5 and step 8, according to 10 × log of formula10(power) changed, wherein power is statistics
Forward power or backward power.
Preferably, in step 10, the acquisition methods of the return loss calibration value Δ RL are, in advance using Network Analyzer
The standing wave ratio of actual port is tested, and is scaled corresponding return loss value RL2, calculates Δ RL=RL2-RL1.
Preferably, in step 11, actual return loss value obtains the reality of standing-wave ratio testing result according to obtained by step 10
Existing mode is to obtain actual standing wave ratio according to self-built in advance RRU return loss table or standing-wave ratio calculation formula.
It is an object of the invention to provide a kind of general standing-wave ratio detection technique of two kinds of standards of LTE RRU：TDD LTE and FDD
Although LTE standard frame structures are different, PBCH broadcast message is used, PBCH signals have fixation in time domain
RE resource blocks send physical broadcast signal, 6 RB of center frequency point are then fixed on frequency domain and carry out signal transmission, successively from time domain
PBCH signals are extracted on upper and frequency domain, it is possible to be truncated to PBCH signals and carry out standing-wave ratio statistics.Can using this method
Solve the problems, such as that detecting standing-wave ratio is forbidden to cause wrong report with light, while ensure that the RRU of two kinds of standards of TD-LTE and FDD-LTE is total to
With a sets of plan.
The present invention has the advantages of following and good effect：
1st, the technical program can ensure to be truncated to forward signal power, reverse signal power are fixed value, are not had
Fluctuation, therefore, the degree of accuracy for improving detection TD-LTE RRU and FDD-LTERRU standing-wave ratios can be easily realized, without influenceing to believe
Number quality.
2nd, while the technical program can easily realize the degree of accuracy for improving detection LTE RRU standing-wave ratios, TD- is ensured
Two kinds of standards of LTE and FDD-LTE share a set of detection scheme.
Brief description of the drawings
It is required in being described below to embodiment to use in order to illustrate more clearly of the technical scheme in the present embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are one embodiment of the present of invention, for this area
For those of ordinary skill, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is descending in a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method provided in an embodiment of the present invention
Radio frames and forward/reverse radio frames timing diagram.
Fig. 2 is a kind of flow of TDD and FDD LTE RRU general standing-wave ratio detecting method provided in an embodiment of the present invention
Figure.
Embodiment
The embodiment of the present application solves existing by providing a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method
There is the problem of standing-wave ratio detection that can not realize TD-LTE and FDD-LTE RRU in technology simultaneously.
The technical scheme of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
A kind of TDD and FDD LTE RRU general standing-wave ratio detecting method, comprises the following steps：
Step 1, downstream signal and the time delay T of preceding reverse link signal are obtaineddl；
Step 2, the configuration information of the cyclic prefix of LTE radio frames is obtained, is obtained according to the configuration information of cyclic prefix
PBCH signal durations TPB；
Step 3, CPU pass through FPGA under signal by the switch of feedback link switch to before to；
Step 4, FPGA is delayed T on the basis of frame headdl+ T1+T2, forward signal is obtained, a length of T3 during data acquisition；
Wherein, T1 is that PBCH signals are delayed relative to frame head, and T2 is collection shift time；
Step 5, PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read
Take and be converted to forward power value PFW；
Step 6, CPU passes through under FPGA to signal and switches to the switch of feedback link reversely；
Step 7, be delayed T on the basis of the header signal in step 4dl+ 10ms+T1+T2, obtains reverse signal, and data are adopted
A length of T3 during collection；
Step 8, with step 5, read and be converted to backward power value PFB；
Step 9, the forward power value and backward power value obtained according to step 5 and step 8, obtains return loss value RL1,
RL1=PFW-PFB；
Step 10, calibrated to obtain actual return loss value RL, RL=RL1+ Δ RL according to return loss calibration value Δ RL；
Step 11, return loss value actual according to obtained by step 10 obtains standing-wave ratio testing result.
The present invention extracts from time domain and to PBCH signals on frequency domain, is stayed by the PBCH signals being truncated to
Bob counts, and is forbidden to cause wrong report so as to solve the problems, such as to detect standing-wave ratio, while ensure two kinds of standards of TD-LTE and FDD-LTE
RRU share a sets of plan.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
Technical scheme is stated to be described in detail.
It is an object of the invention to provide a kind of general standing-wave ratio detection technique scheme of two kinds of standards of LTE RRU, it is intended to easily
Solve the problems, such as that detecting standing-wave ratio is forbidden to cause wrong report, at the same ensure two kinds of standards of TD-LTE and FDD-LTE RRU share it is a set of
Scheme.
In TD-LTE and FDD-LTE standard signals, using PBCH broadcast message (Master
Information Block), include system bandwidth, System Frame Number, PHICH (Physical HARQ Indicator Channel) configuration information, antenna
Information.It is 40ms that PBCH signals, which send the cycle, every in 40ms except the System Frame Number change outer other information holding that adds up is constant
10ms contents keep constant.
PBCH is mapped to preceding 4 OFDM symbols of the 2nd time slot of the 1st subframe of every 1 frame in time domain, according to CP length
Difference, PBCH signals when with two kinds, when a length of 285.43 μ s of PBCH signals, extension CP configurations during conventional CP configuration
A length of 333.36 μ s during PBCH signals.It is 1.08MHz that PBCH signals, which are fixed and take 6RB, on frequency domain, in LTE signal centers frequency
Point.
In summary, signal amplitude is all constant to the PBCH signals of consecutive frame over the frequency domain, and we can incite somebody to action
This section of fixed PBCH signal intercepts out to be detected for RRU standing-wave ratio.
When it is implemented, the present invention can use software engineering implementation process automatic running.Downlink radio frame shown in Figure 1
With forward/reverse radio frames sequential relationship, the embodiment of the present invention is as shown in Fig. 2 comprise the following steps：
Step 1, downstream signal and preceding reverse link signal time delay are measured, is as a result designated as Tdl。
Step 2, the configuration information of the cyclic prefix (CP) of LTE radio frames is obtained, cyclic prefix includes conventional CP and extension
CP, according to two kinds of different CP configuration informations, draw two kinds of different PBCH signals duration TPB；
Wherein, conventional CP PBCH signal durations TPBFor 285.43 μ s, CP PBCH signal durations T is extendedPBFor 333.36
μs。
Step 3, CPU pass through FPGA under signal by the switch of feedback link switch to before to.
Step 4, FPGA is delayed T on the basis of frame headdl+ T1+T2, forward signal is obtained, a length of T3 during data acquisition；
That is, relative frame head delay Tdl+ T1+T2, obtain forward signal；
Wherein, T1 is that PBCH signals are delayed relative to frame head, is constant 0.5ms, and collection shift time T2 should be greater than 2 times
The drift time of system clock, it is ensured that the data collected are PBCH signals.Such as clock keeps most disliking in system index
Clock drift is 10us when bad, then T2 >=20us (=2 × 10us).To ensure, in system clock drift maximum, to collect
Letter is PBCH signals, then suggests acquisition time length T3≤TPB-2×T2。
In addition, if the downstream signal that draws of measurement and preceding reverse link signal time delay are far smaller than T2, in practical application
T can not be considereddl。
Step 5, PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read
Take and change the forward power value drawn to be calculated as PFW。
Step 6, CPU passes through under FPGA to signal and switches to the switch of feedback link reversely.
Step 7, be delayed T on the basis of the header signal in step 4dl+ 10ms+T1+T, obtain reverse signal, data acquisition
Shi Changwei T3；
The frame length of radio frames is 10ms, i.e. consecutive frame is with respect to frame head delay Tdl+ T1+T2, obtain reverse signal.
Step 8, PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read
Take and change the backward power value drawn to be calculated as PFB。
Step 9, according to step 5 and step 8 gained forward power value PFWWith backward power value PFBDraw return loss value
RL1, RL1=PFW-PFB。
Step 10, calibrated to obtain actual return loss value RL, RL=RL1+ Δ RL according to return loss calibration value Δ RL；
Specific implementation can be scaled corresponding echo damage in advance using the standing wave ratio of Network Analyzer test actual port
Consumption value RL2.
The return loss value RL2 obtained using Network Analyzer test is real return loss value, then actual time
Ripple loss RL meets RL=RL2=RL1+ (RL2-RL1), counts Δ RL=RL2-RL1, then RL=RL1+ Δs RL, asks for Δ in advance
After RL, in system normal operation, RRU can be configured as configuration parameter, RL1 gathers calculating and obtained in real time.
Step 11, the actual return loss value according to obtained by step 10, which is tabled look-up or calculated, can obtain actual standing-wave ratio
Value, i.e. standing-wave ratio testing result.
Wherein, in step 5 and step 8, according to 10 × log of formula10(power) changed, wherein power is statistics
Forward power or backward power.
Embodiment first carries out step 3,4,5, rear to perform step 6,7,8；Step 6,7,8 are actually first carried out, perform step afterwards
Rapid 3,4,5 effect be equivalent.
I.e. above-mentioned steps can be carried out in the following order：
(1) CPU passes through under FPGA to signal and switches to the switch of feedback link reversely.
(2) FPGA is delayed T on the basis of frame headdl+ T1+T2, reverse signal is obtained, a length of T3 during data acquisition.
(3) PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read simultaneously
It is converted to backward power value PFB。
(4) CPU pass through FPGA under signal by the switch of feedback link switch to before to.
(5) be delayed T on the basis of the header signal in (2)dl+ 10ms+T1+T2, obtain forward signal, data acquisition duration
For T3.
(6) PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read simultaneously
It is converted to forward power value PFW。
A kind of TDD and FDD LTE RRU provided in an embodiment of the present invention general standing-wave ratio detecting method comprises at least such as
Lower technique effect：
The present invention extracts from time domain and to PBCH signals on frequency domain, is stayed by the PBCH signals being truncated to
Bob counts, and is forbidden to cause wrong report so as to solve the problems, such as to detect standing-wave ratio, while ensure two kinds of standards of TD-LTE and FDD-LTE
RRU share a sets of plan.
It should be noted last that above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (6)
1. a kind of TDD and FDD LTE RRU general standing-wave ratio detecting method, it is characterised in that comprise the following steps：
Step 1, downstream signal and the time delay T of preceding reverse link signal are obtaineddl；
Step 2, the configuration information of the cyclic prefix of LTE radio frames is obtained, PBCH letters are obtained according to the configuration information of cyclic prefix
Number duration TPB；
Step 3, CPU pass through FPGA under signal by the switch of feedback link switch to before to；
Step 4, FPGA is delayed T on the basis of frame headdl+ T1+T2, forward signal is obtained, a length of T3 during data acquisition；
Wherein, T1 is that PBCH signals are delayed relative to frame head, and T2 is collection shift time；
Step 5, PBCH signals are intercepted out by FPGA by the 1.08M bandwidth digitals wave filter of signal center's frequency, are read simultaneously
It is converted to forward power value PFW；
Step 6, CPU passes through under FPGA to signal and switches to the switch of feedback link reversely；
Step 7, be delayed T on the basis of the header signal in step 4dl+ 10ms+T1+T2, reverse signal is obtained, during data acquisition
A length of T3；
Step 8, with step 5, read and be converted to backward power value PFB；
Step 9, the forward power value and backward power value obtained according to step 5 and step 8, obtains return loss value RL1, RL1
=PFW-PFB；
Step 10, calibrated to obtain actual return loss value RL, RL=RL1+ Δ RL according to return loss calibration value Δ RL；
Step 11, return loss value actual according to obtained by step 10 obtains standing-wave ratio testing result.
2. TDD and FDD LTE RRU according to claim 1 general standing-wave ratio detecting method, it is characterised in that step
In 2, the cyclic prefix is conventional CP or extension CP, conventional CP PBCH signal durations TPBFor 285.43 μ s, extend CP's
PBCH signal durations TPBFor 333.36 μ s.
3. TDD and FDD LTE RRU according to claim 1 general standing-wave ratio detecting method, in step 4 and step 7,
T2 >=20 μ s, T3≤TPB-2×T2。
4. TDD and FDD LTE RRU according to claim 1 general standing-wave ratio detecting method, in step 5 and step 8,
According to 10 × log of formula10(power) changed, wherein power is the forward power or backward power of statistics.
5. TDD and FDD LTE RRU according to claim 1 general standing-wave ratio detecting method, it is characterised in that step
In 10, the acquisition methods of the return loss calibration value Δ RL are, in advance using the standing wave of Network Analyzer test actual port
Ratio, and corresponding return loss value RL2 is scaled, calculate Δ RL=RL2-RL1.
6. TDD and FDD LTE RRU according to claim 1 general standing-wave ratio detecting method, it is characterised in that step
In 11, the implementation that the actual return loss value according to obtained by step 10 obtains standing-wave ratio testing result is, advance according to RRU
Self-built return loss table or standing-wave ratio calculation formula obtain actual standing wave ratio.
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| CN112235014A (en) * | 2020-10-13 | 2021-01-15 | Oppo广东移动通信有限公司 | Radio frequency circuit adjusting method and device, electronic equipment and storage medium |
| CN113572542A (en) * | 2021-08-17 | 2021-10-29 | 四川恒湾科技有限公司 | High-precision device and method for detecting standing-wave ratio of radio remote unit |
| WO2021259239A1 (en) * | 2020-06-22 | 2021-12-30 | 中兴通讯股份有限公司 | Standing wave ratio calculation method and apparatus, network device and storage medium |
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