CN103841597B - Frequency point scanning method and device for TD-SCDMA system - Google Patents
Frequency point scanning method and device for TD-SCDMA system Download PDFInfo
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- CN103841597B CN103841597B CN201210492324.2A CN201210492324A CN103841597B CN 103841597 B CN103841597 B CN 103841597B CN 201210492324 A CN201210492324 A CN 201210492324A CN 103841597 B CN103841597 B CN 103841597B
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Abstract
The invention relates to a frequency point scanning method and device for a TD-SCDMA system. The method comprises the steps that a carrier frequency set which needs scanning is selected in a target frequency band; the first round of frequency point scanning is conducted on all carrier frequencies in the carrier frequency set. The first round of frequency point scanning comprises the steps that an initial AGC value is used for setting of a suggested AGC value of the first carrier frequency; the first carrier frequency is scanned, and a base band RSSI value, an air interface RSSI value and an expected AGC value of the first carrier frequency are calculated; the expected AGC value of the first carrier frequency is used for setting of a suggested AGC value of the second carrier frequency, wherein the second carrier frequency is within a preset frequency point interval of the first carrier frequency, the preset frequency point interval is large enough so that the deviation between the second carrier frequency and the air interface RSSI value of the first carrier frequency cannot exceed acceptable deviation; the second carrier frequency is scanned, and a base band RSSI value and an expected AGC value of the second carrier frequency are calculated. In this way, scanning of the other carrier frequencies in the carrier frequency set is completed.
Description
Technical field
The present invention relates to the cell searching in TD-SCDMA system, more particularly, in the frequency sequence of TD-SCDMA system
Method for scanning frequency points and device.
Background technology
The frame structure of TD-SCDMA system is as shown in Figure 1.The code channel 1,2 of time slot TS0 carries PCCPCH, and (Your Majesty controls altogether thing
Reason channel), descending pilot frequency time slot DwPTS carries SYNC_DL.Time slot TS1 to TS6 is business time-slot, carries business datum.TD-
The a length of 10ms of mono- radio frames of SCDMA, is divided into two 5ms subframes.The structure of the two subframes is identical.
As shown in Fig. 2 each subframe is divided into 7 regular time slots and 3 special time slots that length is 675us again.These three
Special time slot is respectively DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot).In 7 routines
In time slot, TS0 is always allocated to downlink, and TS1 is always allocated to up-link.
For TD-SCDMA terminals (UE), during start, lose synchronization after or without network state under, need to TD-SCDMA
All frequencies of network carry out power measurement, and are ranked up according to the result of power measurement, then from the frequency that power is most strong
Proceed by the subsequent process of cell searching.
In start or in the case of losing synchronous, terminal is not aware that the timing of TD-SCDMA network, so terminal meeting
The signal of a complete TD-SCDMA subframe is received, the power of a frequency is just can know that.The concrete steps of this process include：
Arrange and receive unit frequency, receiving a complete sub-frame data carries out power measurement；The data of one subframe are cut into some
Individual block, calculates the RSSI (received signal strength indicator) of each block number evidence；The RSSI maximums for choosing these blocks (are designated as max_
RSSI), as the power of this frequency.In this course, AGC (automatic growth control) value of receiver can affect the survey of RSSI
Amount result.If AGC value is excessive, reception signal saturation is may result in, signal distortion, rssi measurement error is big；If AGC value
It is too small, signal intensity may be caused not obtain enough amplifications, if the low noise lid of the digital processing unit of terminal has crossed base band
The intensity of signal, can cause rssi measurement value bigger than normal.
Accordingly, it would be desirable to pass through the RSSI sizes of base band, rational AGC value is trained, to improve the certainty of measurement of RSSI.
In frequency phase sorting, typically using following AGC control strategies：Each frequency adopts initial AGC value in TD frequency ranges
Frequency point scanning is carried out, the initial AGC value that different frequency bands are used is identical.The initial AGC value of TD frequency ranges, from last round of initial little
The suggestion AGC value of the most strong carrier frequency of RSSI of area searching (ICS)；If the first time search of initial zone after start, then TD frequency ranges
Initial AGC value derive from macrodefined constant information.After the RSSI samplings for having performed a carrier frequency, the carrier frequency is returned
Suggestion AGC value.If the AGC of this data receiver unreasonable (RSSI and the target RSSI deviation ratio such as Base-Band Processing is larger), returns
Return the AGC value of suggestion；Because AGC is unreasonable, this carrier frequency needs repeated sampling；During next round repeated sampling, this carrier frequency will be used
The suggestion AGC value.
Each carrier frequency being not adapted to due to initial AGC value in frequency band, thus most of carrier frequency be intended to the wheel of sampling second,
Third round even more wheels.
After each carrier frequency trains preferable AGC value, or the number of repetition of frequency point scanning is when reaching maximum times, right
The RSSI that eats dishes without rice or wine of each carrier frequency is ranked up.According to the rule that frequency sorts, the follow-up carrier frequency information for attempting synchronous search is picked out,
And carry out the synchronous search routine of cell searching successively.
The AGC repetition strategies of above-mentioned existing frequency phase sorting are suffered from the drawback that：
1st, to improve the accuracy that frequency sorts, general each frequency is required to perform independent AGC training.I.e., often
The scanning of one frequency is required to attempt multiple under the conditions of different AGC, i.e. scanning process will repeat 1~n times (N is TD
The multiple scanning maximum times of frequency, generally 3 times or 5 times).Due to the time overhead for repeating number of times and scanning of scanning
It is directly proportional, therefore scans the excellent summary of repetition strategies, has had a strong impact on the time overhead of full frequency band search.
2nd, because the signal intensity difference of each time slot on TD-SCDMA carrier frequency is very big, therefore when performing frequency sequence, typically
The data for receiving a subframe (5ms) on TD carrier frequency are needed, the measurement of carrier frequency RSSI is performed.Again because TD-SCDMA is not differentiated between
Up-downgoing frequency band, the bandwidth ratio for being configured to main carrier frequency is larger, frequency Numerous, causes to perform a wheel scan of each frequency band
Required time overhead is considerable.
The frequency points of each TD frequency bands of table 1
By taking the TD frequency bands cited by table 1 as an example, it is assumed that each carrier frequency averagely needs three-wheel of sampling, then A+F+E frequency ranges, altogether
Need 3*754=2262 rounds of sampling.Hypothesis completes the process of some carrier frequency, and time of needs is 6ms (wherein data receivers
Continue 5ms, between different carrier frequency data receivers at intervals of 1ms).So, the accumulated time expense of frequency sequence is：
13.572s.Assume just to include center carrier frequence in first three most strong carrier frequency of the RSSI that frequency sequence is returned, then first three follow-up
The about 1.2s of synchronous search time of strong TD cells, the read access time of system information is 0.7s.Therefore the process time that frequency sorts,
Time in search of initial zone takes ratio about 88%.Therefore, optimize the time overhead of frequency sequence, be to improve search property
The key of energy.
The content of the invention
The technical problem to be solved is to provide the automatic gain in a kind of sequence of the frequency of TD-SCDMA system
Control method, to reduce the time that automatic gain control value training aspect is spent.
The present invention proposes a kind of method for scanning frequency points of TD-SCDMA system to solve above-mentioned technical problem, including：
The carrier frequency set for needing scanning is selected in one target band；First round frequency point scanning is performed to each carrier frequency in the carrier frequency set.
The first round frequency point scanning is comprised the following steps：In the carrier frequency set one first is set using an initial automatic gain control value
The suggestion automatic gain control value of carrier frequency；Scanning is performed to first carrier frequency, and calculates the baseband receiving signals of first carrier frequency
Intensity indicates RSSI, eat dishes without rice or wine RSSI and expectation automatic gain control value；Using the expectation automatic growth control of first carrier frequency
Value arranges the suggestion automatic gain control value of one second carrier frequency in the carrier frequency set, and wherein second carrier frequency is in first carrier frequency
Predetermined frequency interval in, predetermined frequency interval be enough to make second carrier frequency and the deviation eated dishes without rice or wine between RSSI of first carrier frequency
Less than an acceptable deviation from；Scanning is performed to second carrier frequency, base band RSSI of second carrier frequency is calculated and is expected automatic
Gain control value；The like, the expectation automatic gain control value obtained using the carrier frequency for completing to scan is arranged this and is made a reservation for
The suggestion automatic gain control value of the neighbouring carrier frequency in frequency interval, so as to complete sweeping to other carrier frequency in the carrier frequency set
Retouch.
In one embodiment of this invention, the step of performing first round frequency point scanning to the carrier frequency set also includes：According to
The scanning result of each carrier frequency in the carrier frequency set determines the need for repeated attempt scanning.
In one embodiment of this invention, said method also includes：To needing the carrier frequency for attempting multiple scanning to perform second
Wheel frequency point scanning.
In one embodiment of this invention, the expectation automatic gain using the carrier frequency obtained in first round frequency point scanning
Controlling value arranges suggestion automatic gain control value of the carrier frequency in the second wheel frequency point scanning.
In one embodiment of this invention, the scanning result of each carrier frequency in the carrier frequency set is determined the need for
Whether the step of repeated attempt is scanned meets including any one for judging following condition：Base band RSSI and one expects base band
The absolute value of the difference of RSSI is less than a thresholding；The scanning times of the carrier frequency reach a maximum scan number of times；The carrier frequency is built
View automatic gain control value reaches a maximum automatic gain control value, but base band RSSI is still less than desired base band RSSI；
Or the suggestion automatic gain control value of the carrier frequency reaches a minimum automatic gain control value, but base band RSSI is still greater than the expectation
Base band RSSI.
In one embodiment of this invention, by the expectation of first carrier frequency obtained in the last search of initial zone
Automatic gain control value is used as the initial automatic gain control value.
In one embodiment of this invention, the carrier frequency set includes all carrier frequency in the target band.
In one embodiment of this invention, the carrier frequency set includes the part carrier frequency in the target band.
In one embodiment of this invention, the part carrier frequency is that compartment of terrain is selected from all carrier frequency of the target band.
In one embodiment of this invention, said method also includes：Eated dishes without rice or wine by completing the carrier frequency of frequency point scanning
RSSI estimates the RSSI that eats dishes without rice or wine of one or more carrier frequency for not carrying out frequency point scanning in its predetermined frequency interval, wherein completing
In the carrier frequency set, one or more carrier frequency of unfinished scanning are outside the carrier frequency set for the carrier frequency of frequency point scanning.
In one embodiment of this invention, the predetermined frequency is at intervals of 1~3.
The present invention also proposes a kind of frequency point scanning device of TD-SCDMA system, including with lower module：For in target frequency
Module with the interior selected carrier frequency set for needing to scan；To the module that first round frequency point scanning is performed to the carrier frequency set, its
Including：The suggestion automatic gain control value of one first carrier frequency in the carrier frequency set is set using an initial automatic gain control value
Module；Scanning is performed to first carrier frequency, and calculated the received signal strength indicator RSSI that eats dishes without rice or wine of first carrier frequency, eated dishes without rice or wine
The module of RSSI and expectation automatic gain control value；Using the expectation automatic gain control value of first carrier frequency, the carrier frequency is set
The module of the suggestion automatic gain control value of one second carrier frequency in set, wherein second carrier frequency is in the predetermined of first carrier frequency
In frequency interval, the predetermined frequency interval be enough to be less than second carrier frequency and the deviation eated dishes without rice or wine between RSSI of first carrier frequency
One acceptable deviation from；Scanning is performed to second carrier frequency, and is calculated base band RSSI of second carrier frequency and is expected automatic gain
The module of controlling value；The like, the expectation automatic gain control value obtained using the carrier frequency for completing to scan arranges this pre-
The suggestion automatic gain control value of the neighbouring carrier frequency in frequency interval is determined, so as to complete to other carrier frequency in the carrier frequency set
The module of scanning.
In one embodiment of this invention, said apparatus also include：The scanning of each carrier frequency in the carrier frequency set
As a result the module of repeated attempt scanning is determined the need for.
In one embodiment of this invention, said apparatus also include being taken turns to needing the carrier frequency for attempting multiple scanning to perform second
The module of frequency point scanning.
In one embodiment of this invention, the expectation automatic growth control using the carrier frequency obtained in the first wheel scan
Value arranges suggestion automatic gain control value of the carrier frequency in the second wheel scan.
In one embodiment of this invention, weight is determined the need for according to the scanning result of each carrier frequency of the carrier frequency set
The multiple module for attempting scanning is whether any one for judging following condition meets：Base band RSSI and one expects base band RSSI
The absolute value of difference is less than a thresholding；The scanning times of the carrier frequency reach a maximum scan number of times；The suggestion of the carrier frequency is automatic
Gain control value reaches a maximum automatic gain control value, but base band RSSI is still less than desired base band RSSI；Or the load
The suggestion automatic gain control value of frequency reaches a minimum automatic gain control value, but base band RSSI is still greater than the desired base band
RSSI。
In one embodiment of this invention, by the expectation of first carrier frequency obtained in the last search of initial zone
Automatic gain control value is used as the initial automatic gain control value.
In one embodiment of this invention, the carrier frequency set includes all carrier frequency in the target band.
In one embodiment of this invention, the carrier frequency set includes the part carrier frequency in the target band.
In one embodiment of this invention, the part carrier frequency is that compartment of terrain is selected from all carrier frequency of the target band.
In one embodiment of this invention, said apparatus also include：For the sky of the carrier frequency by completing frequency point scanning
Mouth RSSI estimates the module of the RSSI that eats dishes without rice or wine of one or more carrier frequency for not carrying out frequency point scanning in its predetermined frequency interval, its
In completed the carrier frequency of frequency point scanning in the carrier frequency set, do not complete one or more carrier frequency of scanning in the carrier frequency set
Outward.
In one embodiment of this invention, the predetermined frequency is at intervals of 1~3.
The such scheme of the present invention, the number of neighbouring carrier frequency on frequency domain is estimated with the RSSI of the carrier frequency for having completed to measure
According to the AGC to be arranged (automatic growth control) value is received, so that when first round frequency point scanning is sampled, most of carrier frequency is all
Accurate AGC value can be set, and have compressed frequency point scanning repeats rate.
Description of the drawings
It is that the above objects, features and advantages of the present invention can be become apparent, below in conjunction with tool of the accompanying drawing to the present invention
Body embodiment elaborates, wherein：
Fig. 1 illustrates TD-SCDMA multi-frame structures.
Fig. 2 illustrates TD-SCDMA subframe structures.
Fig. 3 illustrates the theoretical spectrum of TD carrier waves.
Fig. 4 illustrate Theoretical Calculation after low-pass filtering, the energy diagram that terminal can be received.
Fig. 5 illustrate experiment detection after low-pass filtering, the energy diagram that terminal can be received.
Fig. 6 illustrates the automatic growth control schematic diagram in TD-SCDMA system.
Fig. 7 and Fig. 8 illustrate the frequency point scanning flow chart of one embodiment of the invention.
When Fig. 9 A-9C illustrate the first round frequency point scanning of experiment detection, the adjustment trendgram of AGC.
Specific embodiment
Summarily say, embodiments of the invention are the bandwidth (being commonly defined as 1.6MHz) that make use of TD carrier waves much larger than frequency
The characteristics of point grid 0.2MHz, by RSSI (received signal strength indicator) difference of neighbouring carrier frequency in frequency band it is little the characteristics of, use
Complete the RSSI of carrier frequency that measures to estimate the data receiver AGC to be arranged (the automatic increasings of the neighbouring carrier frequency on frequency domain
Benefit control) value, so as to realize following targets：When first round frequency point scanning is sampled, most of carrier frequency can be arranged and is relatively defined
True AGC value, so as to compress the rate that repeats of frequency point scanning, reduces the time overhead of frequency sequence.
For TD-SCDMA system, the spreading rate of carrier wave is 1.28Mbps, and in theory TD spectrums of carrier band is a width of
1.28MHz, it is assumed that the energy in frequency band is evenly distributed, as shown in figure 3, in figure 3, UARFCN (UTRA absolute
Radio frequency channel number) it is UTRA Absolute Radio Frequency Channels number.
After Network Synchronization is started shooting or lost to terminal (UE), because the carrier energy in the unknown TD frequency bands of terminal is distributed,
Therefore each TD carrier frequency can be successively attempted, by low pass filter, carries out the reception of certain bandwidth self-energy.Assume what terminal was used
Low pass filter is also preferable low pass filter, with a width of 1.28MHz.
It is assumed that the carrier frequency centered on UARFCN=N 1.28MHz bandwidth memories in a TD carrier wave.When
When terminal arranges carrier frequency centered on UARFCN=N, the energy of TD carrier waves 100% can be all received；The energy that terminal is received
Amount, is designated as E, unit dBm.
When carrier frequency centered on terminal arranges UARFCN=N+1, can be TD carrier waves (1.28-0.2)/1.28=84.375%
Energy acceptance come in.Being transformed into exponential form is, in the carrier frequency centered on UARFCN=N+1, terminal can receive (E-
0.76) energy of dBm.That is, from theoretical reckoning, measure to be measured on the RSSI that obtains and carrier frequency N ± 1 on carrier frequency N and obtain
RSSI, differ only by 0.76dB.
In laboratory environments, the signal of single TD carrier waves is configured with center carrier frequence N, and is not nearby had in frequency band
There are other TD carrier waves.UE sets gradually frequency centered on [N-9, N+9] each carrier frequency, measures the RSSI for obtaining as shown in Figure 5.By scheming
5 can analyze and obtain：Within distance center carrier frequency 0.8MHz, the rssi measurement value deviation of the RSSI and center carrier frequence for obtaining is measured
In 3dB or so.
Can be with inference by Fig. 5：When performing the scanning of TD frequency bands according to UARFCN size orders (positive sequence or backward), in TD
In the frequency band that carrier wave is covered, the RSSI differences of neighbouring carrier frequency are little, it is possible to use the RSSI that M carrier frequency measurements are obtained estimate M ±
1st, the AGC value to be arranged of M ± 2, M ± 3 carrier frequency.M carrier frequency can be the arbitrary carrier frequency in TD frequency bands.In addition, in TD carrier waves
Band edge, the RSSI of neighbouring carrier frequency differs greatly, by the rssi measurement value of neighbouring carrier frequency estimate the AGC errors that obtain compared with
Greatly.Therefore after first round frequency point scanning, in addition it is also necessary to using the RSSI of this carrier frequency, when estimating next deuterzooid carrier frequency multiple scanning
The suggestion AGC value for using.
Therefore, in above-mentioned example, when the frequency between two carrier frequency is spaced in the range of 1~3, two carrier frequency it
Between the difference eated dishes without rice or wine between RSSI in the range of acceptable deviation from.Thus can go to estimate further with the measurement RSSI of a wherein carrier frequency
Count another carrier frequency AGC value to be arranged.So, this another carrier frequency has just obtained before scanning relatively reasonable AGC value, from
And reducing needs multiple scanning to train the probability of AGC value.
Of course it is to be understood that in other examples, predetermined frequency interval may be different, therefore those skilled in the art can be with
According to required acceptable deviation from, suitable predetermined frequency interval is selected.
For example, can carry out carrying out the control of following AGC value in frequency point scanning：
The RSSI obtained using N-4 carrier frequency measurements is estimating the N-3 carrier frequency AGC value to be arranged；
The RSSI obtained using N-3 carrier frequency measurements is estimating the N-2 carrier frequency AGC value to be arranged；
The RSSI obtained using N-2 carrier frequency measurements is estimating the N-1 carrier frequency AGC value to be arranged；
The RSSI obtained using N-1 carrier frequency measurements is estimating the N carrier frequency AGC value to be arranged；
The RSSI obtained using N carrier frequency measurements is estimating the N+1 carrier frequency AGC value to be arranged；……
Because the RSSI differences of the neighbouring carrier frequency such as N-4, N-3, N-2, N-1, N, N+1 are within 3dB, therefore carry N is performed
During the scanning of frequency, the multiple AGC training and adjustment of the RSSI intensity carrier frequency are actually had been carried out, therefore use the method,
The AGC that most of carrier frequency is used for the first time can be allowed just to level off to very much desired AGC value.
It is appreciated that going to estimate in predetermined frequency interval using the RSSI value that the carrier frequency for completing to scan is obtained in satisfaction
Other carrier frequency AGC value principle under, the scanning sequency of carrier frequency can have various changes.Above example is a sequential scan
Example.In following another example, first interval is chosen some carrier frequency and is scanned, and recycling has completed the carrier frequency institute of frequency sweep
Other carrier frequency in predetermined frequency interval around it are carried out the estimation of RSSI value by the RSSI value of acquisition.Frequency point scanning order and
The control of AGC value is as follows：
The RSSI obtained using N-4 carrier frequency measurements is estimating the N-2 carrier frequency AGC to be arranged；
The RSSI obtained using N-2 carrier frequency measurements is estimating the N carrier frequency AGC to be arranged；
The RSSI obtained using N carrier frequency measurements is estimating the N+2 carrier frequency AGC to be arranged；……
Finally, estimate that N-3, N-1, N+1 etc. do not sample load by the rssi measurement value of the carrier frequency such as N-4, N-2, N, N+2
The RSSI estimated values of frequency.
Hereinafter illustrate the estimation of AGC arranges values.Fig. 6 illustrates the automatic growth control schematic diagram in TD-SCDMA system.Ginseng
According to shown in Fig. 6, signal is received from antenna 601, into after the process of receiver 602, into baseband processor 603.Into the collection of letters
The signal RSSI of machine 602 is referred to as the RSSI (aerial_RSSI) that eats dishes without rice or wine.Received by a certain secondary data, it is estimated that eating dishes without rice or wine
RSSI, and the desired AGC of the RSSI that eats dishes without rice or wine (being designated as expect_AGC).When performing the data receiver of certain carrier frequency, collecting mail
Certain AGC value set_AGC is set in machine 602, and the process of baseband processor 603 obtains base band RSSI of some strength
(baseband_RSSI).The desired value of base band RSSI is set as desired base band RSSI, EXPECT_BASEBAND_ is expressed as
RSSI (this example adopts -18dB).I.e. it is desired to adjust by AGC value training, base band RSSI is adjusted to the EXPECT_
Near BASEBAND_RSSI.According between this base band RSSI and desired base band RSSI (EXPECT_BASEBAND_RSSI)
Difference, estimation obtains the adjustment amount of AGC value, and new AGC value.When the data receiver of this carrier frequency is done next time, setting makes
With new AGC value.
As shown in fig. 6, there is relationship below：
Aerial_RSSI+set_AGC=baseband_RSSI
In order to adapt to the aerial_RSSI of varying strength, UE needs the set_AGC needed for training and arranging to realize handle
The baseband_RSSI of receiving data is adjusted in desired scope.
Further, there is relationship below：
Aerial_RSSI=baseband_RSSI-set_AGC
Aerial_RSSI=EXPECT_BASEBAND_RSSI-expect_AGC
Therefore, expect_AGC=(EXPECT_BASEBAND_RSSI-baseband_RSSI)+set_AGC
Wherein (EXPECT_BASEBAND_RSSI-baseband_RSSI) is exactly the adjustment amount of AGC value, is designated as delta_
AGC.That is the delta AGC in Fig. 9 A-9C.
After above-mentioned expect_AGC is obtained in a certain carrier frequency, the set_ of neighbouring carrier frequency directly can be set with it
AGC, for use in this adjacent to carrier frequency data receiver and frequency point scanning.Thus embodiments of the invention take full advantage of TD frequency bands
The characteristics of RSSI differences of interior neighbouring carrier frequency are little, uses the expectation AGC value of the carrier frequency (note UARFCN=M) for having completed to measure,
Data receiver to obtain neighbouring carrier frequency (note UARFCN=M ± 1, UARFCN=M ± 2, UARFCN=M ± 3) on frequency domain is wanted
The AGC value of setting, so as to realize following target：When first round frequency point scanning is sampled, most of carrier frequency can arrange coideal
AGC value.The benefit of this result is fully to compress the rate that repeats of frequency point scanning, reduces the time overhead of frequency sequence,
And improve the reliability of frequency ranking results.
For each wheel frequency point scanning, can preferably judge that a certain carrier frequency scans whether obtained AGC is adjusted to
In ideal range, to determine the need for carrying out multiple scanning in this carrier frequency.For example, an absolute thresholding DELTA_ is set
AGC_THRESH (this example adopts 6dB), if the absolute value of delta_AGC that certain one-shot measurement is obtained is less than or equal to DELTA_
AGC_THRESH, then it is assumed that AGC value is had been adjusted in ideal range.That is, if baseband_RSSI meets following expression
Formula, then it is assumed that the AGC of this carrier frequency adjusted ideals：
(-1)*DELTA_AGC_THRESH≤(EXPECT_BASEBAND_RSSI-baseband_RSSI)≤DELTA_
AGC_THRESH
However, there is AGC value cannot be adjusted to all the time the situation of ideal range, the RSSI that for example eats dishes without rice or wine is too little or too big.
For this purpose, terminal can be calibrated in advance by production test, an AGC calibration table can be obtained.Wherein, data receiver can be produced most
Large gain for MAX_AGC；Data receiver can be brought least gain for MIN_AGC.The arranges value of AGC is needed between MIN_
Between AGC and MAX_AGC.
In addition, in order to avoid unconfined multiple scanning, setting is secondary for the maximum scan that some carrier frequency is repeated
Number, is defined as LIMIT_SCAN_TIMES.In an embodiment of the present invention, this maximum scan number of times can take 3,4 or 5.
Sum it up, in embodiments of the invention, meeting one of following condition, it is possible to judged the AGC of this carrier frequency
Ideal is adjusted to, this carrier frequency does not need repeated attempt frequency sweep：
1st, baseband_RSSI is had been adjusted near EXPECT_BASEBAND_RSSI；
That is, the baseband_RSSI of current carrier frequency meets：
(-1)*DELTA_AGC_THRESH≤(EXPECT_BASEBAND_RSSI-baseband_RSSI)≤DELTA_
AGC_THRESH
2nd, this carrier frequency repeated attempt LIMIT_SCAN_TIMES wheels frequency sweep；
3rd, set_AGC has been adjusted to MAX_AGC, but baseband_RSSI still less than EXPECT_BASEBAND_RSSI；
4th, set_AGC has been adjusted to MIN_AGC, but baseband_RSSI still greater than EXPECT_BASEBAND_RSSI.
Fig. 7 and Fig. 8 illustrate the frequency point scanning flow chart of one embodiment of the invention.With reference to shown in Fig. 7 and Fig. 8, frequency point scanning
Method flow is as follows：
First such as step 701, the carrier frequency set for needing scanning is selected in target band.Target band may include one or
Multiple frequency bands.For TD-SCDMA system, frequency band may include A frequency ranges：2010~2025MHz, F-band：1880~
1920MHz, E frequency range：2300~2400MHz or band segment therein.Carrier frequency set may include the part in target band
Or whole carrier frequency.When carrier frequency set only include part carrier frequency when, this part carrier frequency can from all carrier frequency of target carrier frequency,
Select every ground.
In one embodiment, can determine that each frequency band will perform the carrier frequency list of rssi measurement according to UARFCN orders.For
Need perform rssi measurement carrier frequency be recorded as " subsequent execution be frequency sequence first round frequency sweep "；For performing
The carrier frequency of rssi measurement, record correspondence carrier frequency is " need not perform frequency sweep process ".
In step 702, arranging from carrier frequency set needs carrier frequency information to be processed.
Start for each carrier frequency in first to carrier frequency set to carry out first round frequency point scanning from step 703.For frequency row
First wheel scan of sequence, according to UARFCN orders, can successively perform the data receiver of each carrier frequency for requiring and performing rssi measurement.
Specifically, will determine that whether the carrier frequency is to carry out the first wheel scan in step 701, if it is jump to step
704.To be one suggestion AGC value of the Carrier frequency configuration in step 704-706.For example for first carrier frequency, can take in step 705
The suggestion AGC value of the first carrier frequency that last search of initial zone (ICS) preserves.In ICS flow processs, when completing frequency sweep, generally
Preserve the expect_AGC of each TD frequency bands head carrier frequency.
Because the bandwidth of TD-SCDMA system is commonly defined as 1.6MHz, therefore first is configured to center carrier frequence
Frequency (first carrier frequency) is 0.8MHz apart from frequency band edge.
First carrier frequency information and corresponding expect_AGC information are as shown in table 2 below：
The expect_AGC information of each frequency band of table 2 head carrier frequency
For non-first carrier frequency, the suggestion AGC value of a neighbouring carrier frequency in step 706, can be taken.Require this adjacent to carrier frequency
It is the carrier frequency being located in the predetermined frequency of non-first carrier frequency interval.Eating dishes without rice or wine between two carrier frequency in the predetermined frequency interval
Difference between RSSI is in the range of acceptable deviation from.Scanning is performed to the carrier frequency in step 708-710.Such as step 708, carrier frequency is set
AGC value and carrier frequency, receive 1 subframe data.In step 709, the rssi measurement of carrier frequency is performed, calculate this frame number
According to base band RSSI and the RSSI that eats dishes without rice or wine, in step 710, the expectation AGC value of this carrier frequency is calculated according to the RSSI that eats dishes without rice or wine and is preserved.
In step 711, judge whether this carrier frequency has completed whether frequency sweep process, i.e. this carrier frequency also need to carry out repeating to sweep
Frequently.If carrier frequency need not be repeated, in step 712 labelling, this carrier frequency is to complete frequency sweep.For example, generally may determine that and remember
Whether the AGC value for recording this carrier frequency is preferable；If AGC value is preferable, the frequency sweep of labelling this carrier frequency is processed and completed.Other are sentenced
The condition that disconnected frequency sweep is completed may include：This carrier frequency repeated attempt frequency sweep of maximum times；AGC value has been adjusted to maximum
Value, but baseband_RSSI is still less than EXPECT_BASEBAND_RSSI；AGC value has been adjusted to minima, but
Baseband_RSSI is still greater than EXPECT_BASEBAND_RSSI.Conversely, if desired repeating frequency sweep, then step is directly entered
713。
In step 713, the carrier frequency information of next unfinished frequency sweep is read.Here, if first round frequency sweep has been completed,
Then proceed the second wheel frequency sweep as needed, to needing the carrier frequency for attempting multiple scanning to perform second frequency sweep is taken turns.In the second wheel
During frequency sweep, the expectation AGC using the carrier frequency obtained in first round frequency sweep arranges suggestion of the carrier frequency in the second wheel frequency sweep
AGC, such as step 707.The like, third round frequency sweep etc. can be carried out, until reaching maximum sweep.
When finding that all carrier frequency have completed frequency sweep in step 714, then into step 715, otherwise return to step 702.
In step 715, the expectation AGC of each frequency band head carrier frequency will be recorded.Then, as optional step, in step 716, root
According to the rssi measurement value of eating dishes without rice or wine of the carrier frequency for completing frequency sweep, the rssi measurement of eating dishes without rice or wine of the neighbouring carrier frequency for not carrying out frequency sweep is estimated
Value.Here, neighbouring refer to the carrier frequency for not carrying out frequency sweep in the predetermined frequency interval of the carrier frequency for completing frequency sweep.The step for can
Implement in the part carrier frequency during the carrier frequency set that step 701 is selected only includes the target band.If conversely, in step
The 701 carrier frequency set selected include all carrier frequency in the target band, then need not execution step 716.
2 examples exemplified below are explained respectively.
Example 1
From the beginning of first carrier frequency, the RSSI of each carrier frequency is measured one by one.
That is, for A frequency ranges (2010~2025MHz), it is desirable to measure UARFCN=10054,10055,10056......,
The rssi measurement value of 10121 totally 68 carrier frequency.
Example 2
From the beginning of first carrier frequency, at interval of K carrier frequency (value of K can be 1,2,3,4 etc.), next carrier frequency is performed
Rssi measurement.
By taking K=1 as an example, for A frequency ranges (2010~2025MHz), it is desirable to measure UARFCN=10054,10056,
10058......, the rssi measurement value of 10118,10120,10121 totally 35 carrier frequency.
It is then possible to pass through left and right adjacent to the rssi measurement value of carrier frequency to estimate that other 33 are not carried out rssi measurement
The RSSI intensity of eating dishes without rice or wine of carrier frequency.
The algorithm for estimating of one example is：
Aerial_RSSI (m)=[aerial_RSSI (m-1)+aerial_RSSI (m+1)]/2
Finally, in step 717, the frequency power sequence of full frequency band is performed.
The implementation effect of frequency sequence control strategy of the present invention can refer to shown in Fig. 9 A, 9B, 9C, which depict using this
The AGC control flows of bright embodiment, in 2010~2025MHz frequency bands, attempt successively 2010.8MHz, 2011.0MHz ...
During the first round frequency sweep of 2024.2MHz, each carrier frequency rssi measurement value (Fig. 9 A) that frequency sweep is obtained, first round frequency sweep is used
AGC value (Fig. 9 B), and the AGC adjustment amounts (delta AGC) (Fig. 9 C) of carrier frequency in front and back.From Fig. 9 C, in A frequency ranges (2010
~2025MHz) first round frequency sweep in, the signal fluctuation in frequency band is in more than 35dB, and the AGC adjustment amounts of only two frequency bins are larger
(absolute value of delta AGC is more than 6dB), the AGC adjustment amounts that other frequencies are returned respectively less than are equal to 6dB.That is, sweep in the first round
After frequency, the AGC of most carrier frequency arranges preferable；Only being left two carrier frequency needs to repeat frequency sweep.
The execution efficiency of frequency sequence control strategy of the present invention can be found out from the comparison of following example.
In frequency phase sorting, as shown in table 1, the rssi measurement result for obtaining 754 carrier frequency is needed.
According to traditional scheme, each carrier frequency about needs to repeat 3 wheels.Therefore 3*754 subframe of execution is needed to sweep
The reception of frequency evidence.
If definition, frequency phase sorting frequency sweep repeat rate be the actual reception of frequency phase sorting frequency sweep data
Number of subframes and TD frequency bands in carrier frequency sum ratio.
Then the rate that repeats of traditional scheme frequency sweep is 3*754/754=3.0
According to embodiments of the present invention one design, carrier frequency set includes whole carrier frequency, then the first round perform 754 carrier frequency
Search；Second wheel performs the search of 18 carrier frequency；Third round performs the search of 5 carrier frequency.The frequency sweep of this embodiment one
Rate is repeated for (754+18+5)/754=1.03.
That is, frequency phase sorting uses new AGC control strategies, and can substantially reduce frequency sweep repeats rate, from 3.0
Drop to 1.03.Therefore the time overhead of frequency sweep is only the 34% of original strategy.
According to embodiments of the present invention two design, carrier frequency set includes part carrier frequency, and the first round performs searching for 379 carrier frequency
Rope, referring to the statistics of table 3 below；Second wheel performs the search of 32 carrier frequency；Third round performs the search of 11 carrier frequency.This reality
The rate that repeats for applying the frequency sweep of example two is (379+32+11)/754=0.56.
That is, frequency phase sorting uses new AGC control strategies, and can substantially reduce frequency sweep repeats rate, from 3.0
Drop to 0.56.Therefore the time overhead of frequency sweep is only the 19% of original strategy.
Table 3 needs the carrier frequency number for performing rssi measurement
Embodiments of the invention estimate the data of the neighbouring carrier frequency on frequency domain with the RSSI of the carrier frequency for having completed to measure
The AGC to be arranged (automatic growth control) value is received, so that when first round frequency point scanning is sampled, most of carrier frequency all may be used
To arrange upper accurate AGC value, have compressed frequency point scanning repeats rate.Further, embodiments of the invention are with
Jing complete measure carrier frequency RSSI, the RSSI value of the neighbouring carrier frequency come on direct estimation frequency domain, reducing needs to carry out frequency sweep
Frequency quantity.Therefore the present invention can reduce the time overhead of frequency sequence, and improve and search for and to be resident signal stronger
The ability of cell.
Although the present invention is disclosed as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when a little modification and perfect, therefore the protection model of the present invention can be made
Enclose when by being defined that claims are defined.
Claims (22)
1. a kind of method for scanning frequency points of TD-SCDMA system, comprises the following steps：
The carrier frequency set for needing scanning is selected in a target band；
First round frequency point scanning is performed to each carrier frequency in the carrier frequency set, is comprised the following steps：
The suggestion automatic gain control value of one first carrier frequency in the carrier frequency set is set using an initial automatic gain control value；
Perform scanning to first carrier frequency, and calculate that the baseband receiving signals intensity of first carrier frequency indicates RSSI, eat dishes without rice or wine RSSI
And expectation automatic gain control value；
Using first carrier frequency expect automatic gain control value arrange one second carrier frequency in the carrier frequency set suggestion it is automatic
In the predetermined frequency interval of first carrier frequency, the predetermined frequency interval be enough to make this for gain control value, wherein second carrier frequency
The deviation eated dishes without rice or wine between RSSI of the second carrier frequency and first carrier frequency is less than an acceptable deviation from；
Scanning is performed to second carrier frequency, base band RSSI of second carrier frequency is calculated and is expected automatic gain control value；
The like, the expectation automatic gain control value obtained using the carrier frequency for completing to scan is arranged between the predetermined frequency
Every the suggestion automatic gain control value of interior neighbouring carrier frequency, so as to complete the scanning to other carrier frequency in the carrier frequency set.
2. the method for claim 1, it is characterised in that the step of performing first round frequency point scanning to the carrier frequency set is also
Including：The scanning result of each carrier frequency in the carrier frequency set determines the need for repeated attempt scanning.
3. method as claimed in claim 2, it is characterised in that also include：
Frequency point scanning is taken turns to needing the carrier frequency for attempting multiple scanning to perform second.
4. method as claimed in claim 3, it is characterised in that using phase of the carrier frequency obtained in first round frequency point scanning
Hope that automatic gain control value arranges suggestion automatic gain control value of the carrier frequency in the second wheel frequency point scanning.
5. method as claimed in claim 2, it is characterised in that the scanning result of each carrier frequency in the carrier frequency set is true
It is fixed whether to meet including any one for judging following condition the step of whether need repeated attempt to scan：
The absolute value of the difference of base band RSSI and expectation base band RSSI is less than a thresholding；
The scanning times of the carrier frequency reach a maximum scan number of times；
The suggestion automatic gain control value of the carrier frequency reaches a maximum automatic gain control value, but base band RSSI is still less than the phase
Base band RSSI of prestige；Or
The suggestion automatic gain control value of the carrier frequency reaches a minimum automatic gain control value, but base band RSSI is still greater than the phase
Base band RSSI of prestige.
6. the method for claim 1, it is characterised in that by first carrier frequency in the last search of initial zone institute
The expectation automatic gain control value of acquisition is used as the initial automatic gain control value.
7. the method for claim 1, it is characterised in that the carrier frequency set includes all carrier frequency in the target band.
8. the method for claim 1, it is characterised in that the carrier frequency set includes the part carrier frequency in the target band.
9. method as claimed in claim 8, it is characterised in that the part carrier frequency be from all carrier frequency of the target band,
Select compartment of terrain.
10. method as claimed in claim 8 or 9, it is characterised in that also include：By the carrier frequency for completing frequency point scanning
The RSSI that eats dishes without rice or wine estimates the RSSI that eats dishes without rice or wine of one or more carrier frequency for not carrying out frequency point scanning in its predetermined frequency interval, wherein
The carrier frequency of frequency point scanning is completed in the carrier frequency set, one or more carrier frequency of frequency point scanning is not completed in the carrier frequency set
Outward.
11. the method for claim 1, it is characterised in that the predetermined frequency is at intervals of 1~3.
The frequency point scanning device of 12. a kind of TD-SCDMA systems, including with lower module：
For the module for selecting the carrier frequency set for needing scanning in target band；
To the module that first round frequency point scanning is performed to the carrier frequency set, it includes：
The suggestion automatic gain control value of one first carrier frequency in the carrier frequency set is set using an initial automatic gain control value
Module；
Perform scanning to first carrier frequency, and calculate the received signal strength indicator RSSI that eats dishes without rice or wine of first carrier frequency, eat dishes without rice or wine RSSI
And the module of expectation automatic gain control value；
Using first carrier frequency expect automatic gain control value arrange one second carrier frequency in the carrier frequency set suggestion it is automatic
The module of gain control value, wherein second carrier frequency are in the predetermined frequency interval of first carrier frequency, and the predetermined frequency interval is sufficient
So that the deviation eated dishes without rice or wine between RSSI of second carrier frequency and first carrier frequency is less than an acceptable deviation from；
Scanning is performed to second carrier frequency, and is calculated base band RSSI of second carrier frequency and is expected the mould of automatic gain control value
Block；
The like, the expectation automatic gain control value obtained using the carrier frequency for completing to scan is arranged between the predetermined frequency
Every the suggestion automatic gain control value of interior neighbouring carrier frequency, so as to complete the mould of the scanning to other carrier frequency in the carrier frequency set
Block.
13. devices as claimed in claim 12, it is characterised in that also include：Each carrier frequency in the carrier frequency set
Scanning result determines the need for the module of repeated attempt scanning.
14. devices as claimed in claim 13, it is characterised in that also include to needing the carrier frequency for attempting multiple scanning to perform the
The module of two wheel frequency point scannings.
15. devices as claimed in claim 14, it is characterised in that using expectation of the carrier frequency obtained in the first wheel scan
Automatic gain control value arranges suggestion automatic gain control value of the carrier frequency in the second wheel scan.
16. devices as claimed in claim 13, it is characterised in that true according to the scanning result of each carrier frequency of the carrier frequency set
The fixed module for whether needing repeated attempt to scan, is whether any one for judging following condition meets：
The absolute value of the difference of base band RSSI and expectation base band RSSI is less than a thresholding；
The scanning times of the carrier frequency reach a maximum scan number of times；
The suggestion automatic gain control value of the carrier frequency reaches a maximum automatic gain control value, but base band RSSI is still less than expectation
Base band RSSI；Or
The suggestion automatic gain control value of the carrier frequency reaches a minimum automatic gain control value, but base band RSSI is still greater than expectation
Base band RSSI.
17. devices as claimed in claim 12, it is characterised in that by first carrier frequency in the last search of initial zone
The expectation automatic gain control value for being obtained is used as the initial automatic gain control value.
18. devices as claimed in claim 12, it is characterised in that the carrier frequency set includes all loads in the target band
Frequently.
19. devices as claimed in claim 12, it is characterised in that the carrier frequency set includes that the part in the target band carries
Frequently.
20. devices as claimed in claim 19, it is characterised in that the part carrier frequency is all carrier frequency from the target band
In, compartment of terrain is selected.
21. devices as described in claim 19 or 20, it is characterised in that also include：For by completing frequency point scanning
The RSSI that eats dishes without rice or wine of carrier frequency estimates the RSSI that eats dishes without rice or wine of one or more carrier frequency for not carrying out frequency point scanning in its predetermined frequency interval
Module, wherein having completed the carrier frequency of frequency point scanning in the carrier frequency set, do not complete one or more carrier frequency of frequency point scanning
Outside the carrier frequency set.
22. devices as claimed in claim 12, it is characterised in that the predetermined frequency is at intervals of 1~3.
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| CN105450317B (en) * | 2014-07-31 | 2018-03-30 | 展讯通信（上海）有限公司 | A kind of AGC calibration systems and method and mobile terminal |
| CN104244374B (en) * | 2014-09-25 | 2019-03-29 | 联想(北京)有限公司 | A kind of connection control method, connection controller and electronic equipment |
| CN106332228A (en) * | 2015-06-16 | 2017-01-11 | 联芯科技有限公司 | Frequency sweeping method and device according to frequency band |
| CN109348524B (en) * | 2015-06-26 | 2022-11-22 | 华为技术有限公司 | Frequency band searching method and device |
| CN107872811B (en) * | 2016-09-28 | 2021-05-28 | 联芯科技有限公司 | Method and device for determining network distribution frequency point |
| CN109474359B (en) * | 2017-09-08 | 2020-10-20 | 电信科学技术研究院 | Frequency sweeping method, terminal equipment and storage medium |
| CN112996039B (en) * | 2021-02-05 | 2022-11-29 | 北京紫光展锐通信技术有限公司 | Inter-system measurement method and device |
| CN114727368B (en) * | 2022-06-10 | 2022-08-30 | 北京智联安科技有限公司 | Rapid frequency sweeping method, device and medium |
| CN115866721B (en) * | 2023-02-03 | 2023-05-16 | 北京智联安科技有限公司 | NBiot chip frequency sweeping method based on frequency point ordering |
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