CN106332231B - Mobile terminal small region search method and device - Google Patents

Mobile terminal small region search method and device Download PDF

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Publication number
CN106332231B
CN106332231B CN201510371690.6A CN201510371690A CN106332231B CN 106332231 B CN106332231 B CN 106332231B CN 201510371690 A CN201510371690 A CN 201510371690A CN 106332231 B CN106332231 B CN 106332231B
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China
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measured
frequency point
signal strength
strength indication
cell
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CN201510371690.6A
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Chinese (zh)
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CN106332231A (en
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刘腾飞
薛丰廷
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展讯通信(上海)有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information

Abstract

A kind of mobile terminal small region search method and device, the small region search method include: the frequency point to be measured for receiving network side and sending;The signal strength indication for calculating all frequency points to be measured selects the maximum top n of signal strength indication frequency point to be measured;According to the sequence of signal strength indication from big to small, cell searching successively is carried out on the N number of frequency point to be measured selected.Using the method and device, it is capable of the cell of quick selection signal optimal quality.

Description

Mobile terminal small region search method and device

Technical field

The present invention relates to wireless communication field more particularly to a kind of mobile terminal small region search methods and device.

Background technique

Long term evolution (Long Term Evolution, LTE) communication standard is the quasi- 4G that mobile communication field is featured now One of standard.LTE mobile terminal in existing market usually supports a variety of communication moulds such as GSM, GPRS, EDGE, CDMA and LTE Formula.

LTE mobile terminal is in use, it may appear that the case where often toggling between heterogeneous networks mode.Example Such as, for user in making and receiving calls, LTE mobile terminal is in GSM network mode, and when user is linked into RAN network, LTE is mobile Terminal is in LTE network mode.

In order to accomplish being switched fast between various modes, LTE mobile terminal need to measure the letter of slave pattern under holotype Number.Wherein: the network mode that mobile terminal is presently in is referred to as holotype, other network modes are referred to as slave pattern.For example, LTE mobile terminal is currently at GSM network mode, then GSM network mode is referred to as holotype, LTE network mode be referred to as from Mode.

In the prior art, when the holotype of LTE mobile terminal is non-LTE network mode, LTE mobile terminal is discontinuously The LTE frequency point that network side issues is synchronized and measured.By taking China Mobile as an example, the LTE frequency point number that network side issues is most It can be 8, the sequence for the frequency point that LTE mobile terminal is issued according to network side is successively synchronized and measured to 8 frequency points.

However, when LTE mobile terminal is in non-LTE holotype connection status, it is more if LTE frequency point to be measured is excessive A frequency point measurement result all reports the required time longer, switches again after the measurement result for receiving all frequency points, so that The overlong time of cell switching.If carrying out cell switching before all LTE frequency point measurement results to be measured all report, May cause and be switched to signal quality is not optimal cell.

Summary of the invention

The embodiment of the present invention solve be how quick selection signal optimal quality cell the problem of.

To solve the above problems, the embodiment of the present invention provides a kind of mobile terminal small region search method, comprising:

Receive the frequency point to be measured that network side is sent;

The signal strength indication for calculating all frequency points to be measured selects the maximum top n of signal strength indication frequency point to be measured;

According to the sequence of signal strength indication from big to small, cell is successively carried out on the N number of frequency point to be measured selected and is searched Rope.

Optionally, the signal strength indication for calculating all frequency points to be measured, comprising:

Receive the corresponding reference signal of all frequency points to be measured;

The reference signal is subjected to relevant peaks calculating with preset primary synchronization signal respectively, obtains correlation peak.

Optionally, the signal strength indication for calculating all frequency points to be measured, comprising: calculate connecing for all frequency points to be measured Receive signal strength indication value.

Optionally, the received signal strength indication value for calculating all frequency points to be measured, comprising:

Using formula RSSI=SUM (I2+Q2) calculating the received signal strength indication value, in which: RSSI is to receive signal Strength indicator value.

Optionally, the value range of N are as follows: 0 N≤3 <.

The embodiment of the invention also provides a kind of mobile terminal cell search apparatus, comprising:

Receiving unit, for receiving the frequency point to be measured of network side transmission;

Computing unit, for calculating the signal strength indication of all frequency points to be measured;

Selection unit, for from the calculated result that the computing unit obtains, selecting the maximum preceding N of signal strength indication A frequency point to be measured;

Cell search unit, it is successively N number of to be measured what is selected for the sequence according to signal strength indication from big to small Cell searching is carried out on frequency point.

Optionally, the computing unit is used for: by the corresponding reference sync signal point of all frequency points to be measured received Relevant peaks calculating is not carried out with preset primary synchronization signal, obtains correlation peak.

Optionally, the computing unit is used to calculate the received signal strength indication value of all frequency points to be measured.

Optionally, the computing unit uses formula RSSI=SUM (I2+Q2) received signal strength indication value is calculated, Wherein: RSSI is received signal strength indication value.

Optionally, the value range of N are as follows: 0 N≤3 <.

Compared with prior art, the technical solution of the embodiment of the present invention has the advantage that

After the frequency point to be measured for receiving network side transmission, according to the corresponding signal strength indication of frequency point to be measured to be measured Amount frequency point is ranked up, the maximum N number of frequency point to be measured of select-out signal intensity value.According to signal strength indication from big to small suitable Sequence preferentially searches for cell on the maximum frequency point to be measured of signal strength indication.Due to previously according to signal strength indication to be measured Frequency point is ranked up, thus can quick selection signal optimal quality cell.

Detailed description of the invention

Fig. 1 is the flow chart of one of embodiment of the present invention mobile terminal small region search method;

Fig. 2 is that one of embodiment of the present invention mobile terminal small region search method executes timing diagram;

Fig. 3 is that another mobile terminal small region search method in the embodiment of the present invention executes timing diagram;

Fig. 4 is the structural schematic diagram of one of embodiment of the present invention mobile terminal cell search apparatus.

Specific embodiment

In the prior art, when LTE mobile terminal is in non-LTE holotype connection status, if LTE frequency point mistake to be measured More, then multiple frequency point measurement results all report the required time longer, cut again after the measurement result for receiving all frequency points It changes, so that the overlong time of cell switching.If carrying out cell before all LTE frequency point measurement results to be measured all report Switching, then may cause and be switched to signal quality is not optimal cell.

In embodiments of the present invention, corresponding according to frequency point to be measured after the frequency point to be measured for receiving network side transmission Signal strength indication treat measurement frequency point and be ranked up, the maximum N number of frequency point to be measured of select-out signal intensity value.It is strong according to signal The sequence of angle value from big to small preferentially searches for cell on the maximum frequency point to be measured of signal strength indication.Due to previously according to letter Number intensity value is treated measurement frequency point and is ranked up, thus can quick selection signal optimal quality cell.

It is understandable to enable the above objects, features, and advantages of the embodiment of the present invention to become apparent, it is right with reference to the accompanying drawing Specific embodiments of the present invention are described in detail.

Referring to Fig.1, one of embodiment of the present invention mobile terminal small region search method is given, below by way of specific step Suddenly it is described in detail.

Step S101 receives the frequency point to be measured that network side is sent.

In specific implementation, mobile terminal usually takes out portion of time progress when being in the connection mode of holotype The operation such as network measure of other network modes, to ensure the continuity when mobile terminal is switched to other network modes.Cause This can receive the to be measured of other network modes of network side transmission when mobile terminal is in the connection mode of holotype Frequency point list, and network measure operation is executed to the frequency point to be measured in the frequency point list to be measured received.

For example, mobile terminal supports TD-SCDMA network mode and TD-LTE network mode.Mobile terminal is currently at The connection mode of TD-SCDMA holotype, then TD-SCDMA system can distribute to the certain time slot of LTE system, so that LTE system System is able to carry out the operations such as necessary frequency point measurement.

In embodiments of the present invention, receive network side transmission frequency point list to be measured after, be not directly by Measurement frequency point is successively treated according to the frequency point sequence received to measure, but executes step S102.

Step S102 calculates the signal strength indication of all frequency points to be measured.

In specific implementation, the signal of all frequency points to be measured in the frequency point list to be measured got can first be calculated Intensity value.

In embodiments of the present invention, the signal strength indication of each frequency point to be measured can be the corresponding correlation peak of each frequency point, Or the corresponding received signal strength indication value of each frequency point (Received Signal Strength Indication, RSSI), the parameter of frequency point signal strength indication to be measured can also can be characterized for other, be not repeated herein.

In an embodiment of the present invention, the signal strength of all frequency points to be measured is calculated using synchronous relevant peaks method Value.By the corresponding reference sync signal of frequency point to be measured received and local ideal primary synchronization signal (Primary Synchronization Signal, PSS) carry out fast Fourier (Fast Fourier Transformation, FFT) meter It calculates, obtained value is correlation peak.

In an alternative embodiment of the invention, the relevant peaks of all frequency points to be measured are calculated by directly synchronous method Value calculates the correlation peak of frequency point to be measured by formula (1):

Wherein, CuIt (m) is local ideal PSS matrix, C 'uIt (m) is the conjugate matrices of PSS matrix,To receive Signal, m is sequence length, and Corr (u, i) is correlation peak.

In an embodiment of the present invention, the signal strength indication of frequency point to be measured is RSSI, passes through formula RSSI=SUM (I2+ Q2) calculate the received signal strength indication value.

In embodiments of the present invention, after the signal strength indication for calculating all frequency points to be measured, step can be executed S103。

In practical applications, by calculate RSSI come obtain frequency point to be measured signal strength indication method arithmetic speed compared with Fastly, but when there are interference noise, the case where being easy to produce erroneous judgement generation, accuracy be less than obtained using synchronous relevant peaks it is to be measured The method for measuring the signal strength indication of frequency point.Therefore, it can be selected to calculate frequency point signal to be measured according to actual application scenarios The method of intensity value.It, can be strong come the signal for obtaining frequency point to be measured by calculating RSSI when more demanding to time performance Angle value;When higher to precise requirements, the signal strength indication of frequency point to be measured can be obtained using synchronous relevant peaks.

Step S103 selects the maximum top n of signal strength indication frequency point to be measured.

In specific implementation, the signal strength indication for each frequency point to be measured being calculated in step S102 can be arranged Sequence, and therefrom select the maximum top n of signal strength indication frequency point to be measured.

In embodiments of the present invention, when the signal strength indication of frequency point to be measured is characterized by correlation peak, relevant peaks are chosen It is worth maximum top n frequency point to be measured;When the signal strength indication of frequency point to be measured is characterized by received signal strength indication value, choosing Take the maximum top n of received signal strength indication value frequency point to be measured.

In embodiments of the present invention, step S102~step S103 can periodically be executed.

For example, executing primary frequency point sequence to be measured every 30s.It is completed treating measurement frequency point sequence, selects top n letter After number maximum frequency point to be measured of intensity value, the request of additional issue measurement gap (gap) can be sent to current main system.Principal series It unites after the request for receiving additional issue measurement gap, it can be according to currently performed business operation, to determine whether can issue additional Measure gap.Wherein, main system refers to the corresponding system of the current holotype of mobile terminal, for example, the current holotype of mobile terminal is TDS-CDMA, then main system is TDS-CDMA system.

Step S104, it is successively enterprising in the N number of frequency point to be measured selected according to the sequence of signal strength indication from big to small Row cell searching.

In specific implementation, when main system determines that currently performed business can issue additional measurement gap, additional issue measurement gap. In order to not influence the regular traffic of main system, the number of the measurement gap of main system additional issue cannot be excessive.

In embodiments of the present invention, the number for measuring gap can be no more than 30.The number for measuring gap can be according to reality The application scenarios on border are set, as long as being less than or equal to 30.For example, the number of measurement gap is 30.

In practical applications, the holotype of non-LTE is usually that LTE mode is distributed every about 500ms in connected state One measurement gap.Therefore, gap number of measurement that the holotype of non-LTE issues in 5S is about 10, the survey issued in 15s 30 of gap about are measured, the measurement gap issued in 30s is about 60.When the frequency point to be measured of LTE mode is more, example It such as,, can if only issuing 10 measurement gap within the 5s time that the current search period starts when frequency point number to be measured is 8 It can be unable to complete and the signal strength indication of 8 frequency points to be measured is all calculated.

Therefore, in embodiments of the present invention, within the 5s time that the current search period starts, to complete to all to be measured Frequency point carries out signal strength indication calculating.Therefore, gap number of measurement that the holotype of non-LTE issues can be more than or equal to 2 × M, Wherein M is frequency point number to be measured.For example, M=8, then issue additional at least 16 measurement gap in the holotype of the non-LTE of preceding 5s, so that It can complete to calculate the signal strength indication of 8 frequency points to be measured.

It in embodiments of the present invention, can be according to the processing capacity of mobile terminal, the time for measuring gap of additional issue is arranged Range determines before the current search period in how many second, completes the additional issue of measurement gap, enable to meet to all Frequency point to be measured completes sequence and carries out cell searching to the maximum frequency point to be measured of top n signal strength indication therein.At this It invents in an embodiment, non-LTE holotype issues additional 30 measurement gap in the preceding 5s that the current search period starts.In the present invention In another embodiment, 30 measurement gap are issued additional in the preceding 10s that the current search period starts.

It in specific implementation, can be according to step after selecting the maximum frequency point to be measured of top n signal strength indication Current search after the completion of size order and the step S102 for the signal strength indication being calculated in S102~step S103 are executed Gap number of remaining measurement in period, executes cell search on the frequency point to be measured selected.

In embodiments of the present invention, it is N number of to be measured can be pre-estimated according to the cell searching ability of mobile terminal for completion Gap number of measurement needed for frequency point, with this come select on frequency point to be measured carry out cell searching method.

When gap number of remaining measurement is less within the current search period, for example, estimating gap number of measurement can only meet It, can be according to the sequence of signal strength indication from big to small, preferentially in signal when the cell searching of one or two frequency point to be measured Cell searching is carried out on the maximum frequency point to be measured of intensity value.It is completed when being searched on the maximum frequency point to be measured of signal strength indication When, no matter search result is to search cell or do not search cell, can be according to gap number of remaining measurement, to sentence It is disconnected whether on second largest frequency point to be measured of signal strength indication to carry out cell searching.The remaining measurement within the current search period When gap number is enough to complete to a frequency point realization cell search to be measured, second largest to signal strength indication is to be measured Frequency point carries out cell searching.And so on, until gap number of remaining measurement is less, it is unable to complete to a frequency point to be measured It carries out terminating operation when a cell searching.

For example, select maximum preceding 3 frequency points to be measured of signal strength indication, frequency point 1 respectively to be measured, frequency to be measured Point 2 and frequency point to be measured 3.Wherein, the signal strength indication of frequency point 1 to be measured is maximum, and the signal strength indication of frequency point 3 to be measured is most It is small.According to the search capability of mobile terminal, estimates and cell searching 5 measurement gap of needs are completed to a frequency point to be measured, currently Gap number of remaining measurement is 8 in search cycle, and gap number of remaining measurement is less.It therefore, can be first to frequency to be measured Point 1 carries out cell searching.

When finding cell on frequency point 1 to be measured, may be found on frequency point 1 to be measured duration that cell is spent compared with It is few, for example, the duration spent is only 3 gap, at this point, there remains 5 measurements after treating measurement frequency point 1 and completing cell searching Gap can treat measurement frequency point 2 and carry out cell searching.Carry out cell searching on frequency point 2 to be measured, a length of 5 surveys of when search Gap is measured, then can be used in the current search period without remaining measurement gap, therefore, terminates cell search.

The more situation of duration that cell is spent is found on frequency point 1 to be measured it is understood that being also likely to be present, For example, when a length of 6 gap spent, at this point, there remains 2 measurement gap after treating measurement frequency point 1 and completing cell searching, It may be unable to complete and treat the progress cell searching of measurement frequency point 2, therefore, termination search operation.

In embodiments of the present invention, when gap number of remaining measurement is more within the current search period, for example, pre- estimation It, can be to the top n selected frequency point to be measured when gap number of amount can satisfy the cell searching of three or more frequency points to be measured Alternately cell searching.

For example, selecting 3 frequency points to be measured, it is followed successively by frequency point 1~3 to be measured, then the distribution of remaining measurement gap can With are as follows: first measurement gap distributes to frequency point 1 to be measured, and second measurement gap distributes to frequency point 2 to be measured, third measurement Gap distributes to frequency point 3 to be measured.Gap number of measurement needed for completing cell searching as frequency point to be measured is usually multiple, because This, the 4th measurement gap distributes to frequency point 1 to be measured, and the 5th measurement gap distributes to frequency point 2 to be measured, the 6th measurement Gap distributes to frequency point 3 to be measured, and so on, until the cell searching on frequency point 1~3 to be measured terminates.

It in embodiments of the present invention, can be to having searched the to be measured of cell after step S105 is executed and completed Frequency point carries out tracking operation.Other search cycles after the current search period, only currently searched cell to Measurement frequency point distributes a small amount of measurement gap and does tracking measurement, guarantees that the frequency point to be measured for having searched cell does not fall net.

For example, search cell on frequency point 1 to be measured within the current search period, then within next search cycle, root According to the net synchronization capability of mobile terminal, according to the duration between measurement gap, one or more measurements gap is distributed for frequency point 1 to be measured For tracking measurement.

In embodiments of the present invention, within next search cycle, in the signal strength indication for calculating all frequency points to be measured When, the signal strength indication of other frequency points to be measured in addition to the frequency point to be measured for having searched cell can be ranked up, The frequency point to be measured for searching cell need to only be tracked, without again to searching cell in the current search period Frequency point to be measured carries out signal strength indication calculating.

For example, finding cell within the current search period on frequency point 1 to be measured, then being carried out within next search cycle When frequency point signal strength indication to be measured calculates, the signal strength indication of the corresponding frequency point to be measured of frequency point 2~7 to be measured need to be only calculated , one or more measurements gap is distributed for frequency point 1 to be measured and is used for tracking measurement, is carried out without treating measurement frequency point 1 again Signal strength indication calculates.

Referring to Fig. 2, the timing diagram of the mobile terminal cell searching process in one embodiment of the invention is given.

Within each search cycle, main system is distributed the cell that 30 measurement gap are used to carry out LTE network mode and is searched Rope, mobile terminal are received there are 8 frequency points to be measured in the frequency point list to be measured of network side transmission, and calculating is each to be measured A length of 2 measurements gap when needed for frequency point signal strength indication carries out the time required to cell searching being 5 to each frequency point to be measured Measure gap.

The current search period is t0~t2, within the current search period, t0~t1At the moment, measurement gap1~16 are for distinguishing It calculates the signal strength indication of 8 frequency points to be measured and is ranked up.After the completion of sequence, maximum two of select-out signal intensity value to Measurement frequency point, frequency point 1 and frequency point to be measured 2 respectively to be measured.In t1~t2At the moment, measurement gap17~26 for treating respectively Measurement frequency point 1 and frequency point to be measured 2 carry out cell searching, and search on frequency point 1 to be measured and frequency point to be measured 2 small Area.Mobile terminal does not execute measurement operation in remaining measurement gap27~30.

Next search cycle is t3~t5, within next search cycle, t3~t4Moment, due within the current search period Frequency point 1 and frequency point to be measured 2 to be measured find cell, and there is no need to treat measurement frequency point 1 and frequency point to be measured 2 to carry out signal Intensity value calculates, and only need to carry out signal strength indication calculating to remaining frequency point 3~8 to be measured, i.e., only need 12 measurement gap i.e. The achievable sequence for treating measurement frequency point, the frequency point to be measured selected is frequency point 3 to be measured and frequency point to be measured 4, in t4~t5 Moment, measurement gap13~22 carry out cell searching for treating measurement frequency point 3 and 4, and a part in remaining measurement gap can To carry out tracking measurement for treating measurement frequency point 1 and frequency point to be measured 2.

It is understood that in Fig. 2, in next search cycle, in the signal strength indication for calculating frequency point 3~8 to be measured When, use continuous 12 measurements gap.In practical applications, to avoid having searched the frequency point to be measured 1 of cell and to be measured Amount frequency point 2 falls net, can be when calculating the signal strength indication of frequency point 3~8 to be measured, and the intermittent measurement gap that is separated out is for be measured Measure the tracking measurement of frequency point 1 and frequency point to be measured 2.

For example, referring to Fig. 3, the signal strength indication that gap1~2 are used to calculate frequency point 3 to be measured is measured, measurement gap3~4 is used In the signal strength indication for calculating frequency point 4 to be measured, measurement gap7~8 are used to calculate the signal strength indication of frequency point 5 to be measured, measurement Gap9~10 are used to calculate the signal strength indication of frequency point 6 to be measured, and measurement gap13~14 are used to calculate the letter of frequency point 7 to be measured Number intensity value, measurement gap15~16 are used to calculate the signal strength indication of frequency point 8 to be measured, and measurement gap5~6,11~12,17~ 18,24~25 for searched cell frequency point to be measured 1 and frequency point to be measured 2 carry out tracking measurement, measurement gap19~ 23,26~30 cell searching is carried out for treating measurement frequency point 3 and frequency point to be measured 4.

It is understood that in practical applications, there may also be others to measure gap distribution method, main system is increased The measurement gap of hair is allocated, and is not repeated herein.

It can be seen that the mobile terminal small region search method provided in the above embodiment of the present invention, in each search week The strongest frequency point to be measured of signal strength indication can be quickly searched out in phase, and most strong to be measured in the signal strength indication found Cell searching is carried out on amount frequency point.For having found the frequency point to be measured of cell, within the search cycle later, only arrange to survey It measures gap and is used for tracking measurement, carry out signal strength indication calculating and sequence without going again, can make other to be measured Frequency point can also carry out cell searching.

Referring to Fig. 4, the embodiment of the invention provides a kind of mobile terminal cell search apparatus 40, comprising: receiving unit 401, computing unit 402, selection unit 403 and cell search unit 404, in which:

Receiving unit 401, the frequency point to be measured sent for receiving network side within the current search period;

Computing unit 402, for calculating the signal strength indication of all frequency points to be measured;

Selection unit 403, for selecting the maximum top n of signal strength indication frequency point to be measured;

Cell search unit 404, for when receiving the measurement time slot of main system additional issue, according to signal strength indication Sequence from big to small successively carries out cell searching on the N number of frequency point to be measured selected.

In specific implementation, the computing unit 402 can be also used for: within next search cycle, calculating to remove and search for The signal strength indication of other frequency points to be measured except to the frequency point to be measured of cell.

In specific implementation, the computing unit 402 can be used for: the corresponding ginseng of all frequency points to be measured that will be received It examines synchronization signal and carries out relevant peaks calculating with preset primary synchronization signal respectively, obtain correlation peak.

In specific implementation, the computing unit 402 can be used for calculating the received signal strength of all frequency points to be measured Indicated value.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage Medium may include: ROM, RAM, disk or CD etc..

Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute Subject to the range of restriction.

Claims (10)

1. a kind of mobile terminal small region search method characterized by comprising
Receive the frequency point to be measured that network side is sent;
The signal strength indication for calculating all frequency points to be measured selects the maximum top n of signal strength indication frequency point to be measured;
The request of additional issue measurement time slot is sent to main system, and when receiving the measurement time slot of the main system additional issue, according to The sequence of signal strength indication from big to small uses the measurement time slot of the additional issue successively on the N number of frequency point to be measured selected Carry out cell searching;The measurement time slot of the additional issue is that the main system is determined according to currently performed business;
Within next search cycle, the signal of other frequency points to be measured in addition to the frequency point to be measured for having searched cell is calculated Intensity value, and the corresponding time slot of frequency point allocation to be measured that cell is searched in the current search period is tracked.
2. mobile terminal small region search method as described in claim 1, which is characterized in that described to calculate all frequency points to be measured Signal strength indication, comprising:
Receive the corresponding reference sync signal of all frequency points to be measured;
The reference sync signal is subjected to relevant peaks calculating with preset primary synchronization signal respectively, obtains correlation peak.
3. mobile terminal small region search method as described in claim 1, which is characterized in that described to calculate all frequency points to be measured Signal strength indication, comprising: calculate the received signal strength indication value of all frequency points to be measured.
4. mobile terminal small region search method as claimed in claim 3, which is characterized in that described to calculate all frequency points to be measured Received signal strength indication value, comprising:
Using formula RSSI=SUM (I2+Q2) calculating the received signal strength indication value, in which: RSSI is received signal strength Indicated value.
5. mobile terminal small region search method as described in claim 1, which is characterized in that the value range of N are as follows: 0 N≤3 <.
6. a kind of mobile terminal cell search apparatus characterized by comprising
Receiving unit, for receiving the frequency point to be measured of network side transmission;
Computing unit, for calculating the signal strength indication of all frequency points to be measured;
Selection unit is waited for for from the calculated result that the computing unit obtains, selecting the maximum top n of signal strength indication Measurement frequency point;
Cell search unit is issued additional for sending the request of additional issue measurement time slot to main system, and when receiving the main system Measurement time slot when, according to the sequence of signal strength indication from big to small, successively on the N number of frequency point to be measured selected, use The measurement time slot of the additional issue carries out cell searching;The measurement time slot of the additional issue is the main system according to currently performed industry Business determines;
Tracking cell, within next search cycle, other for calculating in addition to the frequency point to be measured for having searched cell are waited for The signal strength indication of measurement frequency point, and it is corresponding to the frequency point allocation to be measured for searching cell in the current search period when Gap is tracked.
7. mobile terminal cell search apparatus as claimed in claim 6, which is characterized in that the computing unit is used for: will connect The corresponding reference sync signal of all frequency points to be measured received carries out relevant peaks calculating with preset primary synchronization signal respectively, obtains To correlation peak.
8. mobile terminal cell search apparatus as claimed in claim 6, which is characterized in that the computing unit is for calculating institute Need the received signal strength indication value of measurement frequency point.
9. mobile terminal cell search apparatus as claimed in claim 8, which is characterized in that the computing unit uses formula RSSI=SUM (I2+Q2) calculating the received signal strength indication value, in which: RSSI is received signal strength indication value.
10. mobile terminal cell search apparatus as claimed in claim 6, which is characterized in that the value range of N are as follows: 0 N≤3 <.
CN201510371690.6A 2015-06-29 2015-06-29 Mobile terminal small region search method and device CN106332231B (en)

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