CN102790993B - Method and device for measuring frequency point power during cell-search stage - Google Patents
Method and device for measuring frequency point power during cell-search stage Download PDFInfo
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- CN102790993B CN102790993B CN201110130978.6A CN201110130978A CN102790993B CN 102790993 B CN102790993 B CN 102790993B CN 201110130978 A CN201110130978 A CN 201110130978A CN 102790993 B CN102790993 B CN 102790993B
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Abstract
The invention discloses a method and device for measuring frequency point power during a cell-search stage. The method includes determining the number of frequency points, which can be measured in a subframe, according to a preset length of a data receiving block; dividing frequency points in need of measurement into frequency point sets according to the number of frequency points; carrying out the following processing on each frequency point set in sequence: determining receiving sequences of frequency points in the frequency point set, sequentially receiving data receiving blocks of each frequency point in the frequency point set according to the sequences, and cycling for preset cycle times; and calculating power of each frequency point according to the received data receiving blocks of each frequency point, wherein the number of the data receiving blocks is the cycle times. The method and device can shorten the total time of power measurement of all frequency points, and improve cell-search speed.
Description
Technical field
The present invention relates to frequency power measurement technology, particularly relate to method and device that a kind of cell search phase carries out frequency power measurement.
Background technology
In TD-SCDMA (TD SDMA) system, its wireless frame structure is general as shown in Figure 1, and wherein, a wireless frame length is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.As shown in Figure 1, each subframe is divided into again 7 regular time slots and 3 special time slots.These three special time slots are respectively DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot).In 7 regular time slots, TS0 always distributes to down link, and TS1 always distributes to up link.DwPTS in each subframe is for descending pilot frequency and synchronously design.This time slot is that the SYNC_DL sequence of 64chips and the protection interval of 32chips form by length, and as shown in Figure 2, the 32chipsGP wherein protects as the hangover of TS0 its structure.TD-SCDMA regular time slots form as shown in Figure 3, is respectively the data block of 352chips, a long Midamble code for 144chips and a long protection interval for 16chips by two length and forms.
When TS-SCDMA terminal is just started shooting, need to carry out power measurement to all frequencies of TD-SCDMA network, and sort according to the result of power measurement, from the frequency that power is the strongest, then carry out the subsequent treatment of Cell searching.
When TD-SCDMA starting up of terminal, terminal does not also know the timing of TD-SCDMA network, so terminal must receive the signal of a subframe, just can know the power of a frequency.Therefore, the method of each frequency power measurement of carrying out conventional is at present: for each frequency, receive the data (6400chips) of a subframe, be some pieces (such as 100 blocks) that length is equal the data cutting of a subframe, slide and calculate the power of each block (such as 64chips), get the power of power maximum wherein as this frequency.
Therefore, above-mentioned frequency power measurement method gathers, and each frequency power measurement needs the time of a subframe (5ms), and the time of having surveyed all frequency power measurements is long.Current 2010 frequency ranges (2010MHz to 2025MHz) need measurement 68 frequency, 1900 frequency ranges (1880MHz to 1920MHz) need measurement 193 frequencies, and 2300 frequency ranges (2300MHz to 2400MHz) need measurement 493 frequencies.Even if current 2300 frequency ranges do not use, also altogether need measurement 261 frequencies, each 5ms, at least needs 1305ms.Therefore, when frequency number is more, very long during the system using existing frequency power measurement method to consume, reduce the speed of Cell searching.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is, a kind of method providing cell search phase to carry out frequency power measurement and device, can reduce the total time for all frequency power measurements, improves the speed of Cell searching.
For this reason, the embodiment of the present invention adopts following technical scheme:
The embodiment of the present invention provides a kind of cell search phase to carry out the method for frequency power measurement, comprising:
Determine the frequency number x that can measure in a subframe according to the length of the data receiver block preset, wherein determine that the formula of frequency number x is: (x+1) N<848, N is the length of described data receiver block;
According to described frequency number, the frequency of required measurement is divided into frequency point sets;
Successively following process is performed for each frequency point sets: the reception order determining frequency point sets intermediate-frequeney point, receives the data receiver block of each frequency in frequency point sets, circulation preset loop number of times like this successively according to this order; Calculate the power of each frequency according to a described cycle-index data receiver block of each frequency received, the formula wherein calculating preset loop number of times Y is:
x is frequency number, and N is the length of data receiver block.
The power that the described cycle-index data receiver block of each frequency that described basis receives calculates each frequency comprises:
For each frequency, calculate the power of this frequency according to each data receiver block of this frequency, get the power of wherein maximum power as this frequency.
The embodiment of the present invention also provides a kind of cell search phase to carry out the device of frequency power measurement, comprising:
Determining unit, for the frequency number x determining measure in a subframe according to the length of the data receiver block preset, wherein determines that the formula of frequency number x is: (x+1) N<848, N is the length of described data receiver block;
Division unit, for being divided into frequency point sets according to described frequency number by the frequency of required measurement;
Processing unit, for performing following process for each frequency point sets successively: the reception order determining frequency point sets intermediate-frequeney point, receive the data receiver block of each frequency in frequency point sets successively according to this order, circulation preset loop number of times like this, the formula wherein calculating preset loop number of times Y is:
x is frequency number, and N is the length of data receiver block;
First computing unit, for calculating the power of each frequency according to a described cycle-index data receiver block of each frequency received.
Described first computing unit specifically for: for each frequency, calculate the power of this frequency according to each data receiver block of this frequency, get the power of wherein maximum power as this frequency.
Technique effect for technique scheme is analyzed as follows:
No longer for the data of each frequency disposable reception subframe, carry out the calculating of frequency power afterwards again; But the frequency number that can measure in a subframe is determined according to the length of data receiver block preset; According to described frequency number, the frequency of required measurement is divided into frequency point sets; For each frequency point sets, receive the data receiver block of each frequency in frequency point sets in order successively, circulation preset loop number of times like this; The power of each frequency is calculated according to a described cycle-index data receiver block of each frequency received.Thus the total time decreased for all frequency power measurements, improve the speed of Cell searching.
Accompanying drawing explanation
Fig. 1 is prior art wireless frame structure schematic diagram;
Fig. 2 is prior art descending pilot frequency time slot structural representation;
Fig. 3 is regular time slots structural representation of the present invention;
Fig. 4 is the method flow schematic diagram that cell search phase of the present invention carries out frequency power measurement;
Fig. 5 is the embodiment of the present invention first principle schematic;
Fig. 6 is the embodiment of the present invention first principle schematic;
Fig. 7 is the embodiment of the present invention the 3rd principle schematic;
Fig. 8 is the embodiment of the present invention the 4th principle schematic;
Fig. 9 is the apparatus structure schematic diagram that embodiment of the present invention cell search phase carries out frequency power measurement.
Embodiment
Below, be described with reference to the accompanying drawings embodiment of the present invention cell search phase and carry out the method for frequency power measurement and the realization of device.
Fig. 4 is the method flow schematic diagram that embodiment of the present invention cell search phase carries out frequency power measurement, and as shown in Figure 4, the method comprises:
Step 401: preset data receives the length of block, determines the frequency number can measured in a subframe, according to described frequency number, the frequency of required measurement is divided into several frequency point sets according to the length of data receiver block.
Wherein, when carrying out the division of frequency point sets according to frequency number, object is only the frequency of required measurement, long a few part is divided according to frequency number, so that the measurement of frequency power respectively, in actual applications, the division carrying out frequency point sets according to frequency number can use the realizations such as arbitrary division rule, such as, the frequency of required measurement is sorted according to size, according to clooating sequence and frequency number from first or last frequency, using several for continuous print frequency frequency as a frequency point sets, etc., do not limit here.
Wherein, the described length according to data receiver block determines that the frequency number can measured in a subframe can comprise:
Frequency number x according to measuring in formulae discovery subframe:
(x+1)N<848； (1)
Wherein, the length N of described data receiver block can autonomous value in actual applications, and general, N value can not be too little, otherwise the fluctuation of measured value is understood larger; N value again can not more than half time slot, otherwise does not likely have the power measured in a time slot that data block can be complete; So the span of N is preferably [32,256]; Preferably, can value be 64chip, now, the maximum occurrences of x can be 12.
Step 402: successively following process is performed for each frequency point sets: the reception order determining frequency point sets intermediate-frequeney point, receives the data receiver block of each frequency in frequency point sets, circulation preset loop number of times like this successively according to this order.
Wherein, generally in actual applications, there is not inevitable contact between frequency, therefore, be no matter the processing sequence of the frequency point sets in the embodiment of the present invention, or the reception order of the inner frequency of frequency point sets does not all limit, in actual applications, can based on convenient process, when improving treatment effeciency, independently determine the processing sequence of frequency point sets or frequency point sets intermediate-frequeney point, such as, can sort according to the size etc. of frequency, not limit here.
Wherein, the computing formula of described cycle-index Y is:
Preferably, Y can get and be greater than
smallest positive integral value.
Step 403: the power calculating each frequency according to Y data receiver block of each frequency received.
Wherein, the realization of this step can be: for each frequency, calculates the reception block power of this frequency according to each data receiver block of this frequency respectively; Get the power of wherein maximum reception block power as this frequency.
Wherein, for this process of reception block power calculating the corresponding frequency of this reception block according to data receiver block in this step, can by this process with receive order together with this data receiver block in step 402 and perform, also can perform again after receiving the data receiver block of all frequencies in frequency point sets, even, perform after receiving the data receiver block of all frequencies.Also namely:
When receiving the data receiver block of a frequency in step 402, namely carry out the calculating that frequency corresponding to this data receiver block receives block power, and store result of calculation; When receiving all data receiver blocks of all frequencies in frequency point sets, as long as obtain the reception block power of each frequency respectively, and get the power of maximum as frequency;
Or, when receiving the data receiver block of a frequency in step 402, do not carry out the calculating receiving block power immediately, but carry out the storage of data receiver block; By the time in frequency point sets all frequencies all data block reception after, then perform step 403, calculate the power of each frequency respectively according to data receiver block; After even can also waiting until all data block reception of all frequencies, then perform step 403, calculate the power of each frequency respectively according to data receiver block.Certainly, latter two method needs to store a large amount of data receiver blocks, thus causes the waste of memory space.
Below, introduce principle embodiment illustrated in fig. 4, to prove the feasibility of the method:
From the frame structure analysis of above-mentioned TD-SCMDA, it is all send in units of time slot that TD-SCDMA community sends signal, and can think constant power in time slot.So, when frequency power measurement, as long as there is the data receiver block of 1 this frequency measured intactly to drop in TS0, just its power can be used as the power of this frequency.
Suppose that the persistence length of each Block is Nchip, adjacent two Block are spaced apart Mchip, as long as meet 2*N+M<848chips, must meet and have a block intactly to drop in TS0, as shown in Figure 5.Therefore, the time of Mchip can be utilized to carry out the power measurement of other frequency, thus realize time division multiplexing, reach the object of reduction frequency phase sorting power measurement time, suppose that the frequency number can measured in a subframe is x, then receive the schematic diagram of the Block of x frequency as shown in Figure 6 and Figure 7, from time shaft, within the time of each subframe, according to frequency 1, frequency 2, frequency 3, so that receive Block to the sequential loop of frequency x.Further, the calculating of frequency power is carried out according to the Block received.
Known based on above analysis, in the embodiment of the present invention shown in Fig. 4, no longer for the data of each frequency disposable reception subframe, carry out the calculating of frequency power afterwards again; But the frequency number that can measure in a subframe is determined according to the length of data receiver block preset; According to described frequency number, the frequency of required measurement is divided into frequency point sets; For each frequency point sets, receive the data receiver block of each frequency in frequency point sets in order successively, circulation preset loop number of times like this; The power of each frequency is calculated according to a described cycle-index data receiver block of each frequency received.Thus the total time decreased for all frequency power measurements, improve the speed of Cell searching.
Analyzing theoretically, in the above embodiment of the present invention, when receiving the block of different frequent points, without any gap, can peak efficiency be reached.Give an example to illustrate, if N=64, then M=720, x=12.If terminal needs measurement 261 frequencies altogether, original method needs 261 subframes, namely the 1305ms time; Use the inventive method, then know needs
subframe, namely 110ms, only employ the time of in prior art general 8.43%.
But in the embodiment shown in above Fig. 4, when carrying out the calculating of formula (1) (2) etc., carry out not needing hardware stabilization time ideally when frequency switches assert, and in actual applications, if only use single TD receiver, realize the switching between different frequent points reception event, hardware is stablized, and (mainly radio-frequency devices is stable) needs the regular hour, as shown in Figure 8, in figure, HW represents hardware stabilization time.
Now, when considering hardware HW stabilization time, suppose that HW is constant, then,
The formula (1) of above-mentioned calculating frequency number will be changed to:
(x+1)N+x(HW)<848 (3)
The formula (2) of above-mentioned calculating Y will be changed to:
Even if when considering hardware stabilization time, the above embodiment of the present invention cannot reach the optimum efficiency of theory analysis, but compares original scheme and still can save a large amount of time.For a typical example, the hardware stabilization time supposing that frequency switches is 0.180ms (general 230chip), then, if terminal needs measurement 261 frequencies altogether, original method approximately needs the 261*5ms+260*0.180ms=1351.8ms time.Use the inventive method, N=64chip, then x=2, a subframe (time of 5ms) must complete the power measurement of 2 frequencies, so the number of subframes altogether needed is:
the namely time of 655ms, thus the time overhead realizing frequency sequence power measurement is former methodical 46.97%.
Corresponding with above method, the embodiment of the present invention also provides a kind of cell search phase to carry out the device of frequency power measurement, and as shown in Figure 9, this device can comprise:
Determining unit 910, for the frequency number determining measure in a subframe according to the length of the data receiver block preset;
Division unit 920, for being divided into frequency point sets according to described frequency number by the frequency of required measurement;
Processing unit 930, for performing following process for each frequency point sets successively: the reception order determining frequency point sets intermediate-frequeney point, receives the data receiver block of each frequency in frequency point sets, circulation preset loop number of times like this successively according to this order;
First computing unit 940, for calculating the power of each frequency according to a described cycle-index data receiver block of each frequency received.
Wherein, determining unit 910 specifically may be used for: the frequency number x:(x+1 according to measuring in following formulae discovery subframe) N<848; Wherein, N is the length of described data receiver block.
Preferably, this device can also comprise:
Second computing unit 950, for using the cycle-index Y in following formulae discovery processing unit:
Preferably, described first computing unit 940 specifically may be used for: for each frequency, calculates the power of this frequency, get the power of wherein maximum power as this frequency according to each data receiver block of this frequency.
In the embodiment of the present invention shown in Fig. 9, no longer for the data of each frequency disposable reception subframe, carry out the calculating of frequency power afterwards again; But the frequency number that can measure in a subframe is determined according to the length of data receiver block preset; According to described frequency number, the frequency of required measurement is divided into frequency point sets; For each frequency point sets, receive the data receiver block of each frequency in frequency point sets in order successively, circulation preset loop number of times like this; The power of each frequency is calculated according to a described cycle-index data receiver block of each frequency received.Thus the total time decreased for all frequency power measurements, improve the speed of Cell searching.
One of ordinary skill in the art will appreciate that, the process realizing the method for above-described embodiment can have been come by the hardware that program command is relevant, described program can be stored in read/write memory medium, and this program performs the corresponding step in said method when performing.Described storage medium can be as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. cell search phase carries out a method for frequency power measurement, it is characterized in that, comprising:
Determine the frequency number x that can measure in a subframe according to the length of the data receiver block preset, wherein determine that the formula of frequency number x is: (x+1) N<848, N is the length of described data receiver block;
According to described frequency number, the frequency of required measurement is divided into frequency point sets;
Successively following process is performed for each frequency point sets: the reception order determining frequency point sets intermediate-frequeney point, receives the data receiver block of each frequency in frequency point sets, circulation preset loop number of times like this successively according to this order; Calculate the power of each frequency according to a described cycle-index data receiver block of each frequency received, the formula wherein calculating preset loop number of times Y is:
x is frequency number, and N is the length of data receiver block.
2. method according to claim 1, is characterized in that, the power that the described cycle-index data receiver block of each frequency that described basis receives calculates each frequency comprises:
For each frequency, calculate the power of this frequency according to each data receiver block of this frequency, get the power of wherein maximum power as this frequency.
3. cell search phase carries out a device for frequency power measurement, it is characterized in that, comprising:
Determining unit, for the frequency number x determining measure in a subframe according to the length of the data receiver block preset, wherein determines that the formula of frequency number x is: (x+1) N<848, N is the length of described data receiver block;
Division unit, for being divided into frequency point sets according to described frequency number by the frequency of required measurement;
Processing unit, for performing following process for each frequency point sets successively: the reception order determining frequency point sets intermediate-frequeney point, receive the data receiver block of each frequency in frequency point sets successively according to this order, circulation preset loop number of times like this, the formula wherein calculating preset loop number of times Y is:
x is frequency number, and N is the length of data receiver block;
First computing unit, for calculating the power of each frequency according to a described cycle-index data receiver block of each frequency received.
4. device according to claim 3, is characterized in that, described first computing unit specifically for: for each frequency, calculate the power of this frequency according to each data receiver block of this frequency, get the power of wherein maximum power as this frequency.
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| KR102020350B1 (en) | 2013-07-19 | 2019-09-10 | 삼성전자 주식회사 | A mobility support for D2D enabled UE in a wireless system |
| CN104811993B (en) * | 2014-01-29 | 2019-01-29 | 联芯科技有限公司 | Frequency point measurement method |
| CN105472638B (en) * | 2014-09-04 | 2019-06-25 | 中国移动通信集团公司 | A kind of different-frequency measuring method and device |
| WO2017163638A1 (en) | 2016-03-22 | 2017-09-28 | 富士電機株式会社 | Case, semiconductor device, and method for manufacturing case |
| CN107708146B (en) * | 2017-09-25 | 2021-01-15 | 北京华力创通科技股份有限公司 | Method and device for measuring signal power of satellite terminal and satellite terminal |
| CN113133018A (en) * | 2021-04-21 | 2021-07-16 | 重庆第二师范学院 | Initial cell search method, medium and terminal applied to 5G new air interface |
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