CN103856974A - Communication terminal and cell measurement method and device in long term evolution system - Google Patents
Communication terminal and cell measurement method and device in long term evolution system Download PDFInfo
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Abstract
The invention relates to a communication terminal and a cell measurement method and a device in a long term evolution (LTE) system. The method comprises the following steps: symbols with cell specific reference signals CRS respectively undergo first time frequency transform to obtain first frequency-domain data, and third frequency-domain data of a cell to be measured on the CRS position is selected from the frequency-domain data and CRS therein undergoes descrambling to obtain a channel estimation result; the channel estimation result is put back to a corresponding position in the first frequency-domain data, frequency-domain data on other positions is zeroed, fourth frequency-domain data is generated and undergoes time frequency transform to obtain a channel impulse response; time-domain data in the channel impulse response is compared with a preset threshold value, and time-domain data which is less than the preset threshold value is zeroed; the processed channel impulse response undergoes second time frequency transform to obtain second frequency-domain data, fifth frequency-domain time of the cell to be measured on the CRS position is selected from the second frequency-domain data, and CRS therein is calculated to obtain reference signal received power. By the technical scheme, the influence of noise interference on cell measurement accuracy can be minimized effectively.
Description
Technical field
The present invention relates to communication technical field, the method and apparatus that particularly a kind of communication terminal and long evolving system small area are measured.
Background technology
The development of mobile communication has added data service transition from initial speech business to speech business, and data service presents obvious acceleration mode, and now increasing user adds 3G (Third Generation) Moblie (3G) grid.For better mobile data experience, the transmittability of 3G system has been showed deficiency gradually, so the long evolving system of 3G system (LTE, Long Term Evolution) arises at the historic moment.LTE improves and has strengthened the aerial access technology of 3G, adopt OFDM (OFDM, OrthogonalFrequency Division Multiplexing) technology and multiple-input, multiple-output (MIMO, Multiple-InputMultiple-Output) technology is as the sole criterion of its wireless network evolution, the highest downstream rate 100Mbps of design, upstream rate 50Mbps.LTE technology is by greatly promoting the experience of user to mobile communication business, for operator brings more technology and cost advantage.Meanwhile, the leading position of legacy cellular mobile technology has also been consolidated in the appearance of LTE technology.
In mobile radio system, the Seamless Mobile of subscriber equipment (UE, User Equipment) is principal character.The state of UE in network is mainly divided into idle condition and connection status, and therefore the mobile management of UE is mainly divided into the mobile management under mobile management and the connection status under idle condition.Movement under idle condition is mainly to realize by cell reselection, is independently carried out by UE; Movement under connection status is mainly to switch to realize by community, is controlled and is carried out by network side (eNodeB).Due to cell reselection and community switch according to being exactly the measurement result of UE to Serving cell and adjacent cell, therefore measurement result is most important for the Seamless Mobile of realizing UE.
The measurement implementation method of UE does not specify in the agreement of LTE, has only specified to measure the required precision that will reach in the agreement of LTE.And in the cell measuring method of more existing LTE systems, conventionally all may be because existing noise jamming to exert an influence to the precision of measuring.
The european patent application that correlation technique can be also EP2381715A1 with reference to publication number, this Patent Application Publication resource measurement and report method in a kind of long evolving system.
Summary of the invention
The problem to be solved in the present invention is that the cell measurement in existing long evolving system may be because existing noise jamming to affect the precision of measurement.
For addressing the above problem, the method that technical solution of the present invention provides a kind of long evolving system small area to measure, comprising:
Symbol with cell specific reference signal CRS is carried out respectively to the first time-frequency conversion;
In the first frequency domain data obtaining, choose community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion;
CRS in described the 3rd frequency domain data is carried out to descrambling, to obtain each subcarrier at the locational channel estimation results of CRS;
Described channel estimation results is put back to the correspondence position in described the first frequency domain data, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data;
Described the 4th frequency domain data is carried out to frequency-time domain transformation, obtain the channel impulse response of time domain;
Described channel impulse response is carried out to denoising, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value;
Channel impulse response after described denoising is carried out to the second time-frequency conversion;
In the second frequency domain data obtaining, choose community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion;
CRS in described the 5th frequency domain data is asked power and averaged, to obtain the Reference Signal Received Power value of described community to be measured.
Optionally, choose community to be measured and realize based on cell information at locational the 3rd frequency domain data of CRS or the 5th frequency domain data, described cell information at least comprises community ID, frame timing and the cyclic prefix mode of community to be measured.
Optionally, described cell information also comprises the subframe sequence number of community to be measured, the CRS in described the 3rd frequency domain data is carried out to subframe sequence number and the community ID of descrambling based on community to be measured and realize.
Optionally, described predetermined threshold value is obtained according to emulation or test case.
Optionally, described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power with by the ratio of emulation or the predetermined parameter alpha of test case, wherein α >1, α increases with the increase of the bandwidth of system.
Optionally, the span of described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power reduce 0dB to 18dB.
Optionally, described the first time-frequency conversion and the second time-frequency conversion are Fourier transform, and described frequency-time domain transformation is inverse Fourier transform.
For addressing the above problem, the device that technical solution of the present invention also provides a kind of long evolving system small area to measure, comprising:
The first time-frequency conversion unit, is suitable for the symbol with cell specific reference signal CRS to carry out respectively the first time-frequency conversion;
First chooses unit, chooses community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion in the first frequency domain data that is suitable for obtaining;
Channel estimating unit, is suitable for the CRS in described the 3rd frequency domain data to carry out descrambling, to obtain each subcarrier at the locational channel estimation results of CRS;
The first processing unit, is suitable for described channel estimation results to put back to the correspondence position in described the first frequency domain data, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data;
Frequency-time domain transformation unit, is suitable for described the 4th frequency domain data to carry out frequency-time domain transformation, obtains the channel impulse response of time domain;
The second processing unit, is suitable for described channel impulse response to carry out denoising, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value;
The second time-frequency conversion unit, is suitable for the channel impulse response after described denoising to carry out the second time-frequency conversion;
Second chooses unit, chooses community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion in the second frequency domain data that is suitable for obtaining;
Power calculation unit, is suitable for the CRS in described the 5th frequency domain data ask power and average, to obtain the Reference Signal Received Power value of described community to be measured.
For addressing the above problem, technical solution of the present invention also provides a kind of communication terminal that comprises the device of measuring above-mentioned long evolving system small area.
Compared with prior art, technical solution of the present invention at least has the following advantages:
By each subcarrier based on community to be measured at the locational channel estimation results of CRS, the first frequency domain data obtaining after the first time-frequency conversion is processed to generate the 4th frequency domain data, then the channel impulse response that described the 4th frequency domain data is carried out obtaining after frequency-time domain transformation carries out denoising, thereby can effectively reduce the impact of noise jamming on cell measurement precision; Follow-uply carry out obtaining the second frequency domain data after the second time-frequency conversion with the channel impulse response after described denoising again, therefrom choose community to be measured at locational the 5th frequency domain data of CRS, CRS in described the 5th frequency domain data is asked power and averages the Reference Signal Received Power value of the described community to be measured of rear acquisition, realized the raising of cell measurement precision.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method measured of the long evolving system small area that provides of embodiment of the present invention;
Fig. 2 is the position view of the symbol with CRS in the next Resource Block of regular circulation prefix;
Fig. 3 is the position view of the symbol with CRS in the next Resource Block of extended cyclic prefix;
Fig. 4 is the structural representation of the device of the long evolving system small area measurement of embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public embodiment.
According to third generation partner program (3GPP, 3rd Generation Partnership Project) TS36.214 specification description is known, in LTE system, in measurement, have three: 1) Reference Signal Received Power (RSRP, Reference Signal Receiving Power), its definition is the linear averaging of cell specific reference signal (CRS, Cell-specific Reference Signal) power in Measurement bandwidth; 2) carrier wave received signal strength indicator (RSSI, Received Signal Strength Indication), its definition is the linear averaging of the interior symbol power with reference signal of Measurement bandwidth, comprises the power of desired signal, cochannel interference, adjacent-channel interference and thermal noise; 3) Reference Signal Received Quality (RSRQ, ReferenceSignal Receiving Quality), its definition is NxRSRP/RSSI, and RSRP and RSSI are shown in above-mentioned definition, and N is the number of Resource Block (RB, Resource Block) in Measurement bandwidth.Wherein two values of RSRP and RSRQ will report, and RSRP has indicated the absolute power of the reference signal receiving, and RSRQ has indicated reference signal power and the relative ratio that receives gross power.In addition, according to related protocol, the bandwidth setting of LTE system has 1.4,3,5,10,15, six kinds of situations of 20MHz, and minimum bandwidth is 1.4MHz.The disposal ability of UE is depended in the selection of Measurement bandwidth, the system bandwidth from 1.4MHz bandwidth to this cell configuration.
From the definition of RSRP and RSSI, the measurement of UE is mainly that the symbol with CRS in descending sub frame is carried out.Particularly, measure and calculate that the RSSI that comprises calculates, RSRP calculates and RSRQ calculates, respectively as shown in the formula:
In formula (1), R (k, l) is the symbol with CRS that the receives data at frequency domain, and L is the number of the symbol with CRS, and N is the number of RB in the bandwidth of measuring, and k and l represent respectively symbol sequence number and the subcarrier sequence number with CRS.Be converted into being expressed as follows of dBm:
Wherein, dB_rfGain represents rf gain.
RSRP is converted into being expressed as follows after dBm:
In formula (3), RSRP is similar to RSSI, is the CRS received power calculating.
RSRQ is expressed as follows with dB:
dB_RSRQ=10*log 10(N)+dBm_RSRP-dBm_RSSI （4）
In the cell measuring method of more existing LTE systems, general all may be because existing noise jamming to exert an influence to the precision of measuring, thereby be difficult to stablize, realize exactly cell measurement.
Embodiment of the present invention is according to the feature of LTE system, the method that provides a kind of long evolving system small area to measure, can measure the signal under different bandwidth configuration, can effectively reduce the impact of noise jamming on cell measurement precision, and can meet protocol requirement precision, there is good stability and versatility.
Fig. 1 is the schematic flow sheet of the method measured of the long evolving system small area that provides of embodiment of the present invention.Refer to Fig. 1, the method that described long evolving system small area is measured comprises:
Step S1, carries out respectively the first time-frequency conversion to the symbol with cell specific reference signal CRS;
Step S2, chooses community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion in the first frequency domain data obtaining;
Step S3, carries out descrambling to the CRS in described the 3rd frequency domain data, to obtain each subcarrier at the locational channel estimation results of CRS;
Step S4, puts back to the correspondence position in described the first frequency domain data by described channel estimation results, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data;
Step S5, carries out frequency-time domain transformation to described the 4th frequency domain data, obtains the channel impulse response of time domain;
Step S6, carries out denoising to described channel impulse response, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value;
Step S7, carries out the second time-frequency conversion to the channel impulse response after described denoising;
Step S8, chooses community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion in the second frequency domain data obtaining;
Step S9, asks power and averages the CRS in described the 5th frequency domain data, to obtain the Reference Signal Received Power value of described community to be measured.
In embodiment of the present invention, cell measurement comprises at least one in Serving cell measurement, co-frequency neighbor cell measurement and iso-frequency adjacent community measurement.In general, carry out conventionally also comprising before cell measurement: cell synchronous and/or adjacent cell search.Cell synchronous is that synchronizing information renewal is carried out in current resident Serving cell, and adjacent cell search is that unknown adjacent cell is searched for, and can search for co-frequency neighbor cell, also can search for iso-frequency adjacent community.In the specific embodiment of the invention, the object of cell synchronous and adjacent cell search is all the cell informations such as the type of community ID, frame timing (or being called frame synchronization) and Cyclic Prefix in order to obtain community to be measured, thereby Dui Gai community is measured.When actual enforcement, the type of cell measurement and measuring sequence flexible configuration as required.Embodiment of the present invention is only to utilizing the measurement computational process that OFDM symbol carries out to be described in detail in cell measurement, and be therefore not described in detail the process dawn known to those skilled in the art of cell synchronous and adjacent cell search.
The method of with specific embodiment, above-mentioned long evolving system small area being measured below elaborates.
It should be noted that, the method that the long evolving system small area that the present embodiment provides is measured, can not only be used in the situation of unknown cell bandwidth and antenna in cell configuration, to measuring in 1.4MHz bandwidth, also can be used for after the bandwidth of known cell, measure being greater than signal in 1.4MHz bandwidth.Especially in the situation that knowing bandwidth of cell and antenna in cell configuration, measure being greater than signal in 1.4MHz bandwidth, more effectively noise decrease disturbs the impact on cell measurement precision, improves certainty of measurement.
When not knowing in the situation of bandwidth of cell and antenna in cell configuration, can, by realizing and measuring in system minimum bandwidth, particularly, on frequency domain, can only measure the subcarrier in the center 1.08MHz bandwidth of system.Such benefit is: after Cell searching, need to not read and resolution system information from CBCH, just can realize each community is measured, thus can simplified measurement control, and shorten the time delay that measurement reports.
According to Cyclic Prefix (CP, Cyclic Prefix) length difference, an also difference of symbol quantity that subframe comprises, in the time adopting regular circulation prefix (Normal CP), a subframe comprises 14 symbols, in the time adopting extended cyclic prefix (Extended CP), a subframe comprises 12 symbols.The cell measurement of long evolving system is mainly at descending sub frame, the symbol with CRS to be carried out, and under different cyclic prefix modes, the position of the symbol with CRS in a Resource Block is different.According to related protocol, under regular circulation prefix and under extended cyclic prefix, respectively as shown in Figures 2 and 3, horizontal direction represents time domain in the position of the symbol with CRS in a Resource Block, in Fig. 2, under regular circulation prefix, a Resource Block has 14 OFDM symbols in time domain, and symbol sequence number is 0 ~ 13, in Fig. 3, under extended cyclic prefix, a Resource Block has 12 OFDM symbols in time domain, and symbol sequence number is 0 ~ 11; Vertical direction represents frequency domain, and in Fig. 2 and Fig. 3, a Resource Block has 12 subcarriers on frequency domain, and subcarrier sequence number is 0 ~ 11.Under regular circulation prefix, in a Resource Block with the symbol of CRS as shown in the grid that Fig. 2 bend is filled, in a subframe, the sequence number of four symbols with CRS is { 0,4,7,11}, under extended cyclic prefix, in a Resource Block with the symbol of CRS as shown in the grid that Fig. 3 bend is filled, in a subframe, the sequence number of four symbols with CRS is { 0,3,6,9}.
Make r (k, i) represent four symbols with CRS in a frame, k=0,1,2,3, be the symbolic number with CRS in a frame; I=0,1 ..., N-1, i is the sampled point of the OFDM symbol under bandwidth of cell, N is total sampled point number.
Execution step S1, carries out respectively the first time-frequency conversion to the symbol with cell specific reference signal CRS.In the present embodiment, described the first time-frequency conversion is Fourier transform, particularly, four symbol r (k, i) with CRS in one frame can be carried out respectively to N point discrete Fast Fourier Transform iterative inversion (FFT, Fast FourierTransform), thereby realize the conversion from time domain to frequency domain, that is:
R (k, i)=FFT[r (k, i)], wherein R (k, i) represents the first frequency domain data obtaining after FFT conversion.
After step S1, execution step S2, chooses community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion in the first frequency domain data obtaining.
In the present embodiment, choose community to be measured and realize based on cell information at locational the 3rd frequency domain data of CRS in step S2, described cell information at least comprises community ID, frame timing and the cyclic prefix mode of community to be measured." cell information " described in the present embodiment can, by directly obtaining in cell synchronous and/or adjacent cell search procedure, also can the information based on obtaining calculate.
Step S2 is the process that reference signal is screened, particularly, according to the community ID of community to be measured, frame timing and cyclic prefix mode, from the first frequency domain data R (k obtaining after FFT conversion, i) in, select community to be measured at locational the 3rd frequency domain data of CRS, obtain R_crs (k, j); Wherein, j is the subset of i, represent in described the 3rd frequency domain data with subcarrier sequence number corresponding to the symbol of CRS, and j=0,1,2 ..., J-1, wherein J is a symbol total number of frequency domain data with CRS in Measurement bandwidth.
After step S2, execution step S3, carries out descrambling to the CRS in described the 3rd frequency domain data, to obtain each subcarrier at the locational channel estimation results of CRS.
In the present embodiment, described cell information also comprises the subframe sequence number of community to be measured, and in step S3, the CRS in described the 3rd frequency domain data R_crs (k, j) being carried out to descrambling is that subframe sequence number based on community to be measured and community ID realize.
Step S3 is the process of reference signal being carried out to descrambling, particularly, according to subframe sequence number and community ID, CRS is carried out to descrambling, and the result obtaining after descrambling is expressed as to H_crs (k, j).Be actually the process of carrying out channel estimating due to CRS is carried out to descrambling, therefore, also H_crs (k, j) can be called to channel estimation results.
After step S3, execution step S4, puts back to the correspondence position in described the first frequency domain data R (k, i) by described channel estimation results, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data R ' (k, i).By the processing of step S4, the channel estimation results of the current channel situation of reflection can be upgraded described the first frequency domain data R (k, i), the frequency domain data zero setting of other positions can be eliminated to a certain extent to the interference of noise.In the present embodiment, will be called the 4th frequency domain data R ' (k, i) through step S4 frequency domain data after treatment.
After step S4, execution step S5, carries out frequency-time domain transformation to described the 4th frequency domain data R ' (k, i), obtains the channel impulse response h (k, i) of time domain.In the present embodiment, frequency-time domain transformation described in step S5 is inverse Fourier transform (IFT, Inverse Fourier Transform), can also be specifically inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform), for realizing described the 4th conversion of frequency domain data R ' (k, i) from frequency domain to time domain, so that subsequent step can be done further denoising to channel impulse response h (k, i) in time domain.
After step S5, execution step S6, to described channel impulse response h (k, i) carry out denoising, described denoising comprises: by described channel impulse response h (k, i) all time domain datas and predetermined threshold value in compare, the time domain data zero clearing that is less than described predetermined threshold value.
In order to calculate more exactly the Reference Signal Received Power of community to be measured, the present embodiment is made further noise reduction process by step S6.Particularly, in time domain, the data of each sample point (being the time domain data in described channel impulse response) and predetermined threshold value (or being called noise reduction door limit value) are compared, the time domain data that is more than or equal to threshold value is thought the data of active path transmission, and the time domain data that is less than threshold value thinks that noise or interference carry out zero clearing.
In the present embodiment, described predetermined threshold value can be obtained according to emulation or test case.When concrete enforcement, described predetermined threshold value can be by the maximum diameter power of channel impulse response h (k, the i) acquisition of time domain and by the ratio of emulation or the predetermined parameter alpha of test case, that is:
Predetermined threshold value=maximum diameter power/α; Wherein α >1, α increases with the increase of system bandwidth.
When the bandwidth of system larger, the channel that the cell measuring method providing by the present embodiment calculates is just more accurate, distinguishable footpath is also just more accurate, therefore, in the situation that knowing bandwidth of cell and antenna in cell configuration, measure being greater than signal in 1.4MHz bandwidth, by step S6 more effectively noise decrease disturb the impact on cell measurement precision, improve certainty of measurement.
It should be noted that, be not limited to the mode of " ratio of maximum diameter power and α " that the present embodiment provides for described predetermined threshold value definite, in other embodiments, also can take more thorough mode, for example, can carry out comprehensive assessment according to maximum diameter power and average power.
In the time that reality is implemented, the span of described predetermined threshold value can be that the maximum diameter power being obtained by the channel impulse response h (k, i) of time domain reduces 0dB to 18dB.For example, described predetermined threshold value can be set as to maximum diameter power and reduce 6dB, except the time domain data of maximum diameter, the time domain data that is less than maximum diameter power 6dB all be thought to noise jamming carries out zero clearing.
After step S6, execution step S7, carries out the second time-frequency conversion to the channel impulse response h ' (k, i) after described denoising.
It should be noted that, the first time-frequency conversion described in the second time-frequency conversion described in step S7 and step S1 is similar, difference is the object difference of carrying out time-frequency conversion to some extent, the first time-frequency conversion is to the symbol r (k with CRS, i) carry out, the channel impulse response h ' (k, i) of the second time-frequency conversion after to denoising carries out.When concrete enforcement, described the second time-frequency conversion can be Fourier transform, can also be fast Fourier transform, thereby realize the conversion from time domain to frequency domain, that is:
R " (k, i)=FFT[h ' (k, i)], wherein R " and (k, i) represent the second frequency domain data through obtaining after FFT conversion.
After step S7, execution step S8, the second frequency domain data R obtaining from described the second time-frequency conversion " choose community to be measured at locational the 5th frequency domain data R_crs ' (k, j) of CRS in (k, i).
It should be noted that, described in step S8, choose community to be measured at locational the 5th frequency domain data the R_crs ' (k of CRS, j) with step S2 described in choose community to be measured at locational the 3rd frequency domain data R_crs (k of CRS, j) mode of operation between is similar, difference is the object difference of choosing to some extent, step S2 is from the first frequency domain data R (k, i) in, choose, obtain the 3rd frequency domain data R_crs (k, j), and step S8 is from the second frequency domain data R " (k, i) in, choose, obtain the 5th frequency domain data R_crs ' (k, j).
After step S8, execution step S9, asks power and averages the CRS in described the 5th frequency domain data R_crs ' (k, j), to obtain the Reference Signal Received Power value of described community to be measured.
Owing to definite CRS being asked to power and averaging specific implementation dawn known to those skilled in the art of the Reference Signal Received Power value that obtains community to be measured, be not described in detail herein.It is to be noted; the object that operates (ask power and average to calculate RSRP) in step S9 is different from prior art; because conventionally can be directly to the 3rd frequency domain data R_crs (k; j) CRS in operates; and in step S9, be to the 5th frequency domain data R_crs ' (k; j) CRS in operates; due to the 5th frequency domain data R_crs ' (k; j) carry out noise reduction process by above-mentioned correlation step; the Reference Signal Received Power value of the community to be measured therefore obtaining can be more accurate, and cell measurement precision is improved.
The method of measuring corresponding to above-mentioned long evolving system small area, the device that embodiment of the present invention also provides a kind of long evolving system small area to measure.Fig. 4 is the structural representation of the device of the long evolving system small area measurement of embodiment of the present invention.As shown in Figure 4, the device that described long evolving system small area is measured comprises: the first time-frequency conversion unit 1, is suitable for the symbol with cell specific reference signal CRS to carry out respectively the first time-frequency conversion; First chooses unit 2, chooses community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion in the first frequency domain data that is suitable for obtaining; Channel estimating unit 3, is suitable for the CRS in described the 3rd frequency domain data to carry out descrambling, to obtain each subcarrier at the locational channel estimation results of CRS; The first processing unit 4, is suitable for described channel estimation results to put back to the correspondence position in described the first frequency domain data, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data; Frequency-time domain transformation unit 5, is suitable for described the 4th frequency domain data to carry out frequency-time domain transformation, obtains the channel impulse response of time domain; The second processing unit 6, is suitable for described channel impulse response to carry out denoising, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value; The second time-frequency conversion unit 7, is suitable for the channel impulse response after described denoising to carry out the second time-frequency conversion; Second chooses unit 8, chooses community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion in the second frequency domain data that is suitable for obtaining; Power calculation unit 9, is suitable for the CRS in described the 5th frequency domain data ask power and average, to obtain the Reference Signal Received Power value of described community to be measured.
In one embodiment, described the first time-frequency conversion and the second time-frequency conversion are Fourier transform, described frequency-time domain transformation is inverse Fourier transform, the span of described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power reduce 0dB to 18dB.
When concrete enforcement, described first chooses unit 2 chooses community to be measured and chooses unit 8 at locational the first frequency domain data of CRS and described second and choose community to be measured and all realize based on cell information at locational the second frequency domain data of CRS, and described cell information at least comprises the timing of community ID, frame and the cyclic prefix mode of community to be measured.In addition, described cell information also comprises the subframe sequence number of community to be measured, and described channel estimating unit 3 is carried out subframe sequence number and the community ID of descrambling based on community to be measured to the CRS in described the 3rd frequency domain data and realized.
In the time that reality is implemented, described first chooses unit 2 and second chooses unit 8 and can be integrated in one and choose among unit, and described the first time-frequency conversion unit 1 and the second time-frequency conversion unit 7 can be integrated among a time-frequency converter unit.
In addition, embodiment of the present invention also provides a kind of communication terminal that comprises the device of measuring above-mentioned long evolving system small area.When actual enforcement, described communication terminal is specifically as follows and is supported in the mobile phone of realizing communication under LTE system, panel computer etc.
The concrete enforcement of the device that described communication terminal and long evolving system small area are measured, the enforcement of the method that can measure with reference to above-mentioned long evolving system small area repeats no more herein.
It will be appreciated by those skilled in the art that, realizing all or part of of device of measuring in communication terminal in above-described embodiment and long evolving system small area is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in computer-readable recording medium, and described storage medium can be ROM, RAM, magnetic disc, CD etc.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible variation and amendment to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (13)
1. the method that long evolving system small area is measured, is characterized in that, comprising:
Symbol with cell specific reference signal CRS is carried out respectively to the first time-frequency conversion;
In the first frequency domain data obtaining, choose community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion;
CRS in described the 3rd frequency domain data is carried out to descrambling, to obtain each subcarrier at the locational channel estimation results of CRS;
Described channel estimation results is put back to the correspondence position in described the first frequency domain data, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data;
Described the 4th frequency domain data is carried out to frequency-time domain transformation, obtain the channel impulse response of time domain;
Described channel impulse response is carried out to denoising, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value;
Channel impulse response after described denoising is carried out to the second time-frequency conversion;
In the second frequency domain data obtaining, choose community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion;
CRS in described the 5th frequency domain data is asked power and averaged, to obtain the Reference Signal Received Power value of described community to be measured.
2. the method that long evolving system according to claim 1 small area is measured, it is characterized in that, choose community to be measured and realize based on cell information at locational the 3rd frequency domain data of CRS or the 5th frequency domain data, described cell information at least comprises community ID, frame timing and the cyclic prefix mode of community to be measured.
3. the method that long evolving system according to claim 2 small area is measured, it is characterized in that, described cell information also comprises the subframe sequence number of community to be measured, the CRS in described the 3rd frequency domain data is carried out to subframe sequence number and the community ID of descrambling based on community to be measured and realize.
4. the method that long evolving system according to claim 1 small area is measured, is characterized in that, described predetermined threshold value is obtained according to emulation or test case.
5. the method that long evolving system according to claim 4 small area is measured, it is characterized in that, described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power with by the ratio of emulation or the predetermined parameter alpha of test case, wherein α >1, α increases with the increase of system bandwidth.
Long evolving system according to claim 1 small area measure method, it is characterized in that, the span of described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power reduce 0dB to 18dB.
7. the method that long evolving system according to claim 1 small area is measured, is characterized in that, described the first time-frequency conversion and the second time-frequency conversion are Fourier transform, and described frequency-time domain transformation is inverse Fourier transform.
8. the device that long evolving system small area is measured, is characterized in that, comprising:
The first time-frequency conversion unit, is suitable for the symbol with cell specific reference signal CRS to carry out respectively the first time-frequency conversion;
First chooses unit, chooses community to be measured at locational the 3rd frequency domain data of CRS from described the first time-frequency conversion in the first frequency domain data that is suitable for obtaining;
Channel estimating unit, is suitable for the CRS in described the 3rd frequency domain data to carry out descrambling, to obtain each subcarrier at the locational channel estimation results of CRS;
The first processing unit, is suitable for described channel estimation results to put back to the correspondence position in described the first frequency domain data, and by the frequency domain data zero setting of other positions, to generate the 4th frequency domain data;
Frequency-time domain transformation unit, is suitable for described the 4th frequency domain data to carry out frequency-time domain transformation, obtains the channel impulse response of time domain;
The second processing unit, is suitable for described channel impulse response to carry out denoising, and described denoising comprises: all time domain datas and predetermined threshold value in described channel impulse response are compared, the time domain data zero clearing that is less than described predetermined threshold value;
The second time-frequency conversion unit, is suitable for the channel impulse response after described denoising to carry out the second time-frequency conversion;
Second chooses unit, chooses community to be measured at locational the 5th frequency domain data of CRS from described the second time-frequency conversion in the second frequency domain data that is suitable for obtaining;
Power calculation unit, is suitable for the CRS in described the 5th frequency domain data ask power and average, to obtain the Reference Signal Received Power value of described community to be measured.
9. the device that long evolving system according to claim 8 small area is measured, it is characterized in that, described first chooses unit selection community to be measured chooses unit selection community to be measured at locational the first frequency domain data of CRS and described second and all realizes based on cell information at locational the second frequency domain data of CRS, and described cell information at least comprises the timing of community ID, frame and the cyclic prefix mode of community to be measured.
10. the device that long evolving system according to claim 9 small area is measured, it is characterized in that, described cell information also comprises the subframe sequence number of community to be measured, and described channel estimating unit is carried out subframe sequence number and the community ID of descrambling based on community to be measured to the CRS in described the 3rd frequency domain data and realized.
11. long evolving system according to claim 8 small areas measure device, it is characterized in that, the span of described predetermined threshold value serve as reasons described time domain channel impulse response obtain maximum diameter power reduce 0dB to 18dB.
The device that 12. long evolving system according to claim 8 small areas are measured, is characterized in that, described the first time-frequency conversion and the second time-frequency conversion are Fourier transform, and described frequency-time domain transformation is inverse Fourier transform.
13. 1 kinds of communication terminals, is characterized in that, comprise the device that the long evolving system small area described in claim 8 to 12 any one is measured.
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