CN102790993A - 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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- CN102790993A CN102790993A CN2011101309786A CN201110130978A CN102790993A CN 102790993 A CN102790993 A CN 102790993A CN 2011101309786 A CN2011101309786 A CN 2011101309786A CN 201110130978 A CN201110130978 A CN 201110130978A CN 102790993 A CN102790993 A CN 102790993A
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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, relating in particular to a kind of Cell searching stage carries out the method and the device of frequency power measurement.
Background technology
In TD-SCDMA (TD SDMA) system, its wireless frame structure is generally as shown in Figure 1, and wherein, a wireless frame length is 10ms, is divided into two 5ms subframes.The structure of this two sub-frame is identical.As shown in Figure 1, each subframe is divided into 7 conventional time slots and 3 special time slots again.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 conventional time slots, TS0 always distributes to down link, and TS1 always distributes to up link.DwPTS in each subframe for descending pilot frequency with design synchronously.This time slot is that the SYNC_DL sequence of 64chips and the protection of 32chips are formed at interval by length, and its structure is as shown in Figure 2, and wherein the 32chipsGP of front is as the hangover protection of TS0.The conventional time slot format of TD-SCDMA is as shown in Figure 3, is respectively by two length that the data block, of 352chips is long to be formed for the protection of 16chips for the Midamble sign indicating number of 144chips and one are long at interval.
When just started shooting in the TS-SCDMA terminal, need carry out power measurement to all frequencies of TD-SCDMA network, and sort according to the result of power measurement, begin to carry out the subsequent treatment of Cell searching then from the strongest frequency of power.
When the TD-SCDMA starting up of terminal, the timing of TD-SCDMA network is not also known in the terminal, so the signal of a sub-frame must be received in the terminal, just can know the power of a frequency.Therefore; The method of each frequency power measurement of carrying out commonly used is at present: for each frequency; Receive the data (6400chips) of a sub-frame; Is the data cutting of a sub-frame some (such as 100 pieces) of equal in length, slide to calculate the power of each piece (such as 64chips), gets wherein power maximum as the power of this frequency.
Therefore, above-mentioned frequency power measurement method gathers, and each frequency power measurement needs the time of a sub-frame (5ms), and the time of having surveyed all frequency power measurements is long.Present 2010 frequency ranges (2010MHz is to 2025MHz) need to measure 68 frequencies, and 1900 frequency ranges (1880MHz is to 1920MHz) need to measure 193 frequencies, and 2300 frequency ranges (2300MHz is to 2400MHz) need to measure 493 frequencies.Even present 2300 frequency ranges are not used, also need measure 261 frequencies altogether, each 5ms needs 1305ms at least.Therefore, very long when using the system that existing frequency power measurement method consumed under the more situation of frequency number, reduced the speed of Cell searching.
Summary of the invention
In view of this, the technical problem that the present invention will solve is, provides a kind of Cell searching stage to carry out the method and the device of frequency power measurement, can reduce the total time for all frequency power measurements, improves the speed of Cell searching.
For this reason, the embodiment of the invention adopts following technical scheme:
The embodiment of the invention provides a kind of Cell searching stage to carry out the method for frequency power measurement, comprising:
Confirm the frequency number of institute's energy measurement in the sub-frame according to the length of preset Data Receiving piece;
According to said frequency number the frequency of required measurement is divided into the frequency set;
Set is handled below carrying out for each frequency successively: confirm the reception order of frequency set intermediate-frequeney point, receive the Data Receiving piece of each frequency in the frequency set successively according to this order, so cycle-index is preset in circulation; Said cycle-index data according to each frequency that receives receive the power that piece calculates each frequency.
Wherein, the length of the preset Data Receiving piece of said basis confirms that the frequency number of institute's energy measurement in the sub-frame comprises:
Calculate said frequency according to following formula and count x: (x+1) N＜848;
Wherein, N is the length of said Data Receiving piece.
The computational methods of said preset cycle-index comprise:
Use following formula computation cycles number of times Y:
The power that the said cycle-index of each frequency that said basis a receives data receive each frequency of piece calculating comprises:
For each frequency, calculate the power of this frequency according to each Data Receiving piece of this frequency, get the power of wherein maximum power as this frequency.
The embodiment of the invention also provides a kind of Cell searching stage to carry out the device of frequency power measurement, comprising:
Confirm the unit, be used for confirming the frequency number of sub-frame institute energy measurement according to the length of preset Data Receiving piece;
Division unit is used for according to said frequency number the frequency of required measurement being divided into the frequency set;
Processing unit, handle below being used for successively carrying out for each frequency set: confirm the reception order of frequency set intermediate-frequeney point, receive the Data Receiving piece of each frequency in the frequency set successively according to this order, so cycle-index is preset in circulation;
First computing unit is used for receiving the power that piece calculates each frequency according to a said cycle-index data of each frequency that receives.
Wherein, confirm that the unit specifically is used for: the frequency that calculates sub-frame institute energy measurement according to following formula is counted x: (x+1) N＜848; Wherein, N is the length of said Data Receiving piece.
Also comprise: second computing unit is used for using the cycle-index Y of following formula calculation processing unit:
Said first computing unit specifically is used for: for each frequency, calculate the power of this frequency according to each Data Receiving piece of this frequency, get the power of wherein maximum power as this frequency.
Technique effect analysis for technique scheme is following:
No longer, carry out the calculating of frequency power afterwards again for the data of disposable reception one sub-frame of each frequency; But confirm the frequency number of institute's energy measurement in the sub-frame according to the length of preset Data Receiving piece; According to said frequency number the frequency of required measurement is divided into the frequency set; For each frequency set, receive the Data Receiving piece of each frequency in the frequency set in order successively, so the preset cycle-index of circulation; Said cycle-index data according to each frequency that receives receive the power that piece calculates each frequency.Thereby reduced total time, improved the speed of Cell searching for all frequency power measurements.
Description of drawings
Fig. 1 is a prior art wireless frame structure sketch map;
Fig. 2 is a prior art descending pilot frequency time slot structural representation;
Fig. 3 is the conventional structure of time slot sketch map of the present invention;
Fig. 4 carries out the method flow sketch map of frequency power measurement for the Cell searching stage of the present invention;
Fig. 5 is first principle schematic of the embodiment of the invention;
Fig. 6 is first principle schematic of the embodiment of the invention;
Fig. 7 is the 3rd principle schematic of the embodiment of the invention;
Fig. 8 is the 4th principle schematic of the embodiment of the invention;
Fig. 9 carries out the apparatus structure sketch map of frequency power measurement for the embodiment of the invention Cell searching stage.
Embodiment
Below, being described with reference to the accompanying drawings the embodiment of the invention Cell searching stage carries out the method for frequency power measurement and the realization of device.
Fig. 4 is the method flow sketch map that the embodiment of the invention Cell searching stage carries out the frequency power measurement, and as shown in Figure 4, this method comprises:
Step 401: preset data receives the length of piece, confirms the frequency number of institute's energy measurement in the sub-frame according to the length of Data Receiving piece, according to said frequency number the frequency of required measurement is divided into several frequencies set.
Wherein, when carrying out the division of frequency set according to the frequency number, purpose only is the frequency with required measurement; Divide long several parts according to the frequency number, so that the measurement of frequency power respectively, in practical application; The division of carrying out frequency set according to the frequency number can be used arbitrarily realizations such as division rule, for example, the frequency of required measurement is sorted according to size; Begin from first or last frequency according to clooating sequence and frequency number; Several frequencies of continuous frequency are gathered as a frequency, or the like, do not limit here.
Wherein, said length according to the Data Receiving piece confirms that the frequency number of institute's energy measurement in the sub-frame can comprise:
Calculate the frequency of institute's energy measurement in the sub-frame according to formula and count x:
(x+1)N＜848； (1)
Wherein, can be in the practical application autonomous value of the length N of said Data Receiving piece, general, the N value can not be too little, otherwise the fluctuation meeting of measured value is bigger; The N value can not surpass half time slot again, otherwise might not have data block to understand the complete power in the time slot that measures; So the span of N is preferably [32,256]; Preferably, can value be 64chip, at this moment, the maximum occurrences of x can be 12.
Step 402: set is handled below carrying out for each frequency successively: confirm the reception order of frequency set intermediate-frequeney point, receive the Data Receiving piece of each frequency in the frequency set successively according to this order, so cycle-index is preset in circulation.
Wherein, generally in practical application, there is not necessary relation between the frequency, therefore; No matter be the processing sequence of the frequency set in the embodiment of the invention, perhaps the frequency reception order of gathering inner frequency does not all limit, in practical application; Can handle based on convenient, improve under the situation of treatment effeciency, independently confirm the processing sequence of frequency set or frequency set intermediate-frequeney point; For example, can sort, not limit here according to size of frequency etc.
Wherein, the computing formula of said cycle-index Y is:
Preferably, Y can get the smallest positive integral value greater than
.
Step 403: Y data according to each frequency that receives receive the power that piece calculates each frequency.
Wherein, the realization of this step can for: for each frequency, calculate the reception piece power of this frequency respectively according to each Data Receiving piece of this frequency; Get the power of wherein maximum reception piece power as this frequency.
Wherein, For this processing of reception piece power in this step according to the corresponding frequency of this reception piece of Data Receiving piece calculating; Can carry out handling with receiving this Data Receiving piece order in the step 402; Also can be in receiving frequency set carry out again behind the Data Receiving piece of all frequencies, even, after receiving the Data Receiving piece of all frequencies, carry out.Also promptly:
When receiving the Data Receiving piece of a frequency in the step 402, promptly carry out the calculating that this Data Receiving piece frequency points corresponding receives piece power, and the storage computation result; In receiving frequency set during all Data Receiving pieces of all frequencies,, and get maximum and get final product as the power of frequency as long as obtain the reception piece power of each frequency respectively;
Perhaps, when receiving the Data Receiving piece of a frequency in the step 402, do not receive the calculating of piece power immediately, but carry out the storage of Data Receiving piece; By the time after all data blocks of all frequencies received and finish in the frequency set, execution in step 403 again, calculated the power of each frequency respectively according to the Data Receiving piece; Even all data blocks that can also wait until all frequencies receive finish after, execution in step 403 again, calculate the power of each frequency respectively according to the Data Receiving piece.Certainly, back two kinds of methods need be stored lot of data and received piece, thereby cause the waste of memory space.
Below, introduce principle embodiment illustrated in fig. 4, so that prove the feasibility of this method:
Can know from the frame structure analysis of above-mentioned TD-SCMDA that it all is to be that unit sends with the time slot that signal is sent in the TD-SCDMA sub-district, and in time slot, can think constant power.So, in the frequency power measurement,, just can its power be used as the power of this frequency as long as there is the Data Receiving piece of this frequency of 1 measurement intactly to drop in the TS0.
The persistence length of supposing each Block is Nchip, and adjacent two Block are spaced apart Mchip, as long as satisfy 2*N+M＜848chips, must satisfy has a block intactly to drop in the TS0, as shown in Figure 5.Therefore, can utilize the time of Mchip to carry out the power measurement of other frequency, thereby realize time division multiplexing; Reach the purpose of reduction frequency phase sorting power measurement time, suppose that the frequency number that can measure in the sub-frame is x, then receive sketch map such as Fig. 6 and shown in Figure 7 of the Block of x frequency; See from time shaft; In the time of each subframe, according to frequency 1, frequency 2, frequency 3, so that receive Block to the sequential loop of frequency x.And, carry out the calculating of frequency power according to the Block that receives.
Can know based on above analysis, in the embodiment of the invention shown in Figure 4, no longer, carry out the calculating of frequency power afterwards again for the data of disposable reception one sub-frame of each frequency; But confirm the frequency number of institute's energy measurement in the sub-frame according to the length of preset Data Receiving piece; According to said frequency number the frequency of required measurement is divided into the frequency set; For each frequency set, receive the Data Receiving piece of each frequency in the frequency set in order successively, so the preset cycle-index of circulation; Said cycle-index data according to each frequency that receives receive the power that piece calculates each frequency.Thereby reduced total time, improved the speed of Cell searching for all frequency power measurements.
Analyze theoretically, in the above embodiment of the invention, when receiving the block of different frequent points, have no the gap, can reach peak efficiency.Give an example and explain, if N=64, M=720 then, x=12.If the terminal need be measured 261 frequencies altogether, original method needs 261 subframes, just 1305ms time; Use the inventive method; Then knowledge needs
subframe; 110ms has just only used in the prior art time of general 8.43%.
But in above embodiment shown in Figure 4, when the calculating of carrying out formula (1) (2) etc., be not needing under the hardware perfect condition of stabilization time when frequency switches to carry out in identification; And in practical application; If only use single TD receiver, realize the switching between the different frequent points reception incident, hardware stable (mainly being the stable of radio-frequency devices) needs the regular hour; As shown in Figure 8, HW representes hardware stabilization time among the figure.
At this moment, under the situation of considering hardware HW stabilization time, suppose that HW is constant, then,
The formula (1) of aforementioned calculation frequency number will be changed to:
(x+1)N+x(HW)＜848 (3)
The formula of aforementioned calculation Y (2) will be changed to:
Even considering that the above embodiment of the present invention can't reach the optimum efficiency of theory analysis, still can save great amount of time but compare original scheme under the hardware situation of stabilization time.Take a typical example, be 0.180ms (general 230chip) hardware stabilization time of supposing that frequency switches, and then, if the terminal need be measured 261 frequencies altogether, original method approximately needs the 261*5ms+260*0.180ms=1351.8ms time.Use the inventive method; N=64chip; X=2 then; One subframe (time of 5ms) must be accomplished the power measurement of 2 frequencies; So the number of subframes that needs altogether is:
be the time of 655ms just, thereby the time overhead of realizing frequency ordering power measurement is 46.97% of original method.
Corresponding with above method, the embodiment of the invention also provides the device that a kind of Cell searching stage carries out the frequency power measurement, and as shown in Figure 9, this device can comprise:
Wherein, confirm that unit 910 specifically can be used for: the frequency that calculates sub-frame institute energy measurement according to following formula is counted x: (x+1) N＜848; Wherein, N is the length of said Data Receiving piece.
Preferably, this device can also comprise:
Second computing unit 950 is used for using the cycle-index Y of following formula calculation processing unit:
Preferably, said first computing unit 940 specifically can be used for: for each frequency, calculate the power of this frequency according to each Data Receiving piece of this frequency, get the power of wherein maximum power as this frequency.
In the embodiment of the invention shown in Figure 9, no longer, carry out the calculating of frequency power afterwards again for the data of disposable reception one sub-frame of each frequency; But confirm the frequency number of institute's energy measurement in the sub-frame according to the length of preset Data Receiving piece; According to said frequency number the frequency of required measurement is divided into the frequency set; For each frequency set, receive the Data Receiving piece of each frequency in the frequency set in order successively, so the preset cycle-index of circulation; Said cycle-index data according to each frequency that receives receive the power that piece calculates each frequency.Thereby reduced total time, improved the speed of Cell searching for all frequency power measurements.
One of ordinary skill in the art will appreciate that; The process of the method for realization the foregoing description can be accomplished through the relevant hardware of program command; Described program can be stored in the read/write memory medium, and this program when carrying out the corresponding step in the said method.Described storage medium can be like ROM/RAM, magnetic disc, CD etc.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (8)
1. Cell searching stage is carried out the method for frequency power measurement, it is characterized in that, comprising:
Confirm the frequency number of institute's energy measurement in the sub-frame according to the length of preset Data Receiving piece;
According to said frequency number the frequency of required measurement is divided into the frequency set;
Set is handled below carrying out for each frequency successively: confirm the reception order of frequency set intermediate-frequeney point, receive the Data Receiving piece of each frequency in the frequency set successively according to this order, so cycle-index is preset in circulation; Said cycle-index data according to each frequency that receives receive the power that piece calculates each frequency.
2. method according to claim 1 is characterized in that, the length of the Data Receiving piece that said basis is preset confirms that the frequency number of institute's energy measurement in the sub-frame comprises:
Calculate said frequency according to following formula and count x: (x+1) N＜848;
Wherein, N is the length of said Data Receiving piece.
3. method according to claim 1 is characterized in that, the computational methods of said preset cycle-index comprise:
Use following formula computation cycles number of times Y:
4. according to each described method of claim 1 to 3, it is characterized in that the power that the said cycle-index of each frequency that said basis a receives data receive each frequency of piece calculating comprises:
For each frequency, calculate the power of this frequency according to each Data Receiving piece of this frequency, get the power of wherein maximum power as this frequency.
5. Cell searching stage is carried out the device of frequency power measurement, it is characterized in that, comprising:
Confirm the unit, be used for confirming the frequency number of sub-frame institute energy measurement according to the length of preset Data Receiving piece;
Division unit is used for according to said frequency number the frequency of required measurement being divided into the frequency set;
Processing unit, handle below being used for successively carrying out for each frequency set: confirm the reception order of frequency set intermediate-frequeney point, receive the Data Receiving piece of each frequency in the frequency set successively according to this order, so cycle-index is preset in circulation;
First computing unit is used for receiving the power that piece calculates each frequency according to a said cycle-index data of each frequency that receives.
6. device according to claim 5 is characterized in that, confirms that the unit specifically is used for: the frequency that calculates sub-frame institute energy measurement according to following formula is counted x: (x+1) N＜848; Wherein, N is the length of said Data Receiving piece.
7. device according to claim 5 is characterized in that, also comprises:
Second computing unit is used for using the cycle-index Y of following formula calculation processing unit:
8. according to each described device of claim 5 to 7; It is characterized in that; Said first computing unit specifically is used for: for each frequency, calculate the power of this frequency according to each Data Receiving piece of this frequency, get the power of wherein maximum power as this frequency.
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| CN105472638A (en) * | 2014-09-04 | 2016-04-06 | 中国移动通信集团公司 | Different-frequency measuring method and device |
| CN107708146A (en) * | 2017-09-25 | 2018-02-16 | 北京华力创通科技股份有限公司 | The method, apparatus and ICBM SHF satellite terminal of ICBM SHF satellite terminal measured signal power |
| US10264520B2 (en) | 2013-07-19 | 2019-04-16 | Samsung Electronics Co., Ltd. | Method of supporting mobility of UE supporting/using D2D communication in wireless mobile communication system |
| US10424522B2 (en) | 2016-03-22 | 2019-09-24 | Fuji Electric Co., Ltd. | Case, semiconductor device and manufacturing method of case |
| 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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