CN103167585A - Frequency point sequencing method and system in terminal cell search - Google Patents
Frequency point sequencing method and system in terminal cell search Download PDFInfo
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- CN103167585A CN103167585A CN2011104139698A CN201110413969A CN103167585A CN 103167585 A CN103167585 A CN 103167585A CN 2011104139698 A CN2011104139698 A CN 2011104139698A CN 201110413969 A CN201110413969 A CN 201110413969A CN 103167585 A CN103167585 A CN 103167585A
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Abstract
The invention relates to a frequency point sequencing method and a system in terminal cell search so as to reduce time consumed for power measurement in frequency point sequencing. The method includes the following steps: a series of to-be-searched frequency points arranged according to frequency are divided into a plurality of frequency point groups, each frequency point group comprises a plurality of adjacent frequency points, and one of the plurality of adjacent frequency points is used as the representing frequency point of the frequency point group; the power of the representing frequency point in each frequency point group is measured and used as the group power of the frequency point group; the plurality of frequency point groups are sequenced according to the group power; at least one candidate frequency point group with the largest group power is selected from the plurality of frequency point groups; the power of frequency points except the representing frequency point in each candidate frequency point group is measured; the group power of the non-candidate frequency point groups in the plurality of frequency point groups is given to other frequency points except the representing frequency points in the non-candidate frequency point group; and each frequency point is sequenced according to the power.
Description
Technical field
The present invention relates to mobile communication system, more particularly, relate to the Cell searching of mobile communication system.
Background technology
In mobile communication system, after initially powering on, mobile terminal (User Equipment, UE) needs to search the residential quarter that may exist, and selects suitable residential quarter login.Only after UE signs in to the residential quarter, can obtain the more detailed information in this residential quarter and obtain the information of adjacent cell, also only after signing in to the residential quarter, just can monitor paging or make a call.Usually be cell initial searching process search the procedure definition that signs in to suitable cell from start.
With the TD-SCDMA system, carry out the starting stage of Cell searching at starting up of terminal, need to measure the power of each frequency, and and then sequence, begin to carry out the subsequent process of Cell searching from the strongest frequency of power.Due in when start, terminal is not also known the timing of network, so terminal must receive the signal of a subframe, just can know the power of a frequency.The method of search frequency and sequence is that each frequency receives a complete sub-frame data and carries out power measurement, and travels through all frequencies at present.The shortcoming of this method is that the time of each frequency power measurement subframe of needs (5ms), the time cost that travels through all frequencies is long.
Summary of the invention
Technical problem to be solved by this invention is to provide the frequency point sequencing method in a kind of Cell searching, to reduce the needed Measuring Time of frequency sequence.
The present invention is that to solve the problems of the technologies described above the technical scheme that adopts be the frequency point sequencing method that proposes in a kind of terminal Cell searching, comprise the following steps: a series of frequencies according to frequency permutation to be searched are divided into a plurality of frequency groups, and each frequency group comprises a plurality of adjacent frequencies and described a plurality of adjacent frequency, and one of them is the representative frequency of described frequency group; Measure the power of the representative frequency in each frequency group as the group power of described frequency group; Described a plurality of frequency groups are sorted according to group power; Choose prominent at least one the candidate's frequency group of group from described a plurality of frequency groups; Measure the power of the frequency beyond representative frequency in each described candidate's frequency group; With the group power of the non-candidate's frequency group in described a plurality of frequency groups, give other frequencies outside the representative frequency in this non-candidate's frequency group; And according to watt level, each frequency is sorted.
In one embodiment of this invention, the adjacent frequency number that comprises of each frequency group is 2 to 5.
In one embodiment of this invention, the representative frequency in each frequency group is the center frequency point of frequency group.
In one embodiment of this invention, described a series of frequency is a working frequency range that is arranged in terminal.
In one embodiment of this invention, the quantity of described candidate's frequency group is 6.
In one embodiment of this invention, described method is to carry out in the TD-SCDMA terminal.
In one embodiment of this invention, described method is to carry out in the WCDMA terminal.
The another frequency ordering system that proposes in a kind of terminal Cell searching of the present invention comprises:
Be used for a series of frequencies according to frequency permutation to be searched are divided into the device of a plurality of frequency groups, wherein each frequency group comprises a plurality of adjacent frequencies and described a plurality of adjacent frequency one of them is the representative frequency of described frequency group;
Be used for to measure each frequency group representative frequency power and as the device of the group power of described frequency group;
Be used for the device of described a plurality of frequency groups according to the sequence of group power;
Be used for choosing from described a plurality of frequency groups the device of prominent at least one the candidate's frequency group of group;
The device that is used for the power of the representative frequency of each described candidate's frequency group of measurement frequency in addition;
Be used for the group power with non-candidate's frequency group of described a plurality of frequency groups, give the device of other frequencies outside the representative frequency in this non-candidate's frequency group; And
For the device that each frequency is sorted according to watt level.
The present invention is owing to adopting above technical scheme, make it compared with prior art, method of the present invention is due to each frequency power of measuring due to a need in the stronger candidate's frequency group of power few in number, and the non-candidate frequency group weak to each power, only measure a representative frequency power, therefore significantly reduced frequency and measured number of times, thereby reduced the time of cost.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the frame structure of TD-SCDMA system.
Fig. 2 illustrates the subframe structure of TD-SCDMA system.
Fig. 3 illustrates the frequency point sequencing method flow chart of one embodiment of the invention.
Fig. 4 illustrates the frequency distribution map of two neighbor cells.
Embodiment
The following examples of the present invention will be described in the frequency point sequencing method in the Cell searching that mobile communication terminal carries out.As an example, mobile communication terminal can comprise that mobile phone, panel computer etc. have the portable electric appts of mobile communication module.Embodiment below will describe implementation process of the present invention as an example of the TD-SCDMA system example, but be appreciated that and invention can be implemented in other mobile communication system, for example in the WCDMA system.
Fig. 1 illustrates the frame structure of TD-SCDMA system.As shown in Figure 1, the code channel 1 of time slot TS0,2 carrying PCCPCH, DwPTS (descending pilot frequency time slot) carries SYNC_DL.Time slot TS1 is business time-slot to TS6, the bearer service data.The TD-SCDMA residential quarter must transmitted signal on TS0 and DwPTS.
Wireless frame length of TD-SCDMA is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.Fig. 2 further illustrates the subframe structure of TD-SCDMA system.As shown in Figure 2, each subframe is divided into again 7 conventional time slots and 3 special time slots that length is 675us.These three special time slots are respectively DwPTS, 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.
When the TS-SCDMA terminal had just been started shooting, the power that needs to search each possible frequency sorted, and finds the strongest some frequencies of power to carry out Cell searching.In the present invention, by choosing representational frequency, rather than travel through the time cost that all frequencies are reduced to the measurement that the frequency sequence carries out.
Fig. 3 illustrates the frequency point sequencing method flow chart of one embodiment of the invention.With reference to shown in Figure 3, at first as step 301, a series of frequencies according to frequency permutation to be searched are divided into a plurality of frequency groups.Each frequency group comprises a plurality of adjacent frequencies.As an example, the quantity of frequency can be 2-5.For simplicity, the frequency number that the frequency group comprises is usually consistent, but this is not construed as limiting, and allows the frequency number of part frequency group different from the frequency number of other frequency groups.In a plurality of adjacent frequencies of each frequency group, choose a representative frequency.For instance, can be take continuous 5 frequencies as a frequency group, with the measurement power of that frequency in the middle of in the frequency group group power as this frequency group.At this, think that approx the power of interior other each frequencies of frequency group and the power that represents frequency are equal or close, in follow-up measurement, will at first measure the power of representative frequency.
In actual mobile communication system, terminal may can be operated in a plurality of frequency ranges.Therefore the grouping of frequency is carried out respectively for each frequency range.For example for the TS-SCDMA system, 2010 frequency ranges (2010MHz is to 2025MHz) need to measure 68 frequencies, take continuous 5 frequencies as a frequency group, can be divided into 14 frequency groups, and (1880MHz is to the 1920MHz) of 1900 frequency ranges needs to measure 193 frequencies, take continuous 5 frequencies as a frequency group, can be divided into 39 frequency groups.
Then, at step 302-303, measure the power of the representative frequency in each frequency group, and as the group power of place frequency group.In this course, every several frequencies, choose a representative frequency and measure power, until travel through all frequency groups.The benefit of this step is, in all frequency groups of traversal, needn't travel through all frequencies, and therefore measuring required time will shorten dramatically than traditional approach.
In step 304, a plurality of frequency groups are sorted according to the group watt level.At this, the index of power can be RSSI commonly used.Be understandable that, if be positioned at a plurality of frequency ranges in the frequency group of measuring, sort also respectively for each frequency range in the size of organizing power.
Then, in step 305, choose prominent at least one the candidate's frequency group of group from a plurality of frequency groups.The quantity of candidate's frequency group can search expend time in and searching accuracy between compromise.In general, the quantity of candidate's frequency group is chosen to such an extent that more meeting causes expending the more time, and the quantity of candidate's frequency group and choose to such an extent that lacked and may some true cell again do not measured, can need to be from random search in 5 frequencies because there is no more frequency power prior information in follow-up flow process.In one embodiment, consider classical scene, have 3 residential quarters at central point, each residential quarter 1.6MHz needs 2 frequency groups to cover, and altogether needs 6 frequency groups, therefore can choose 6 the strongest candidate's frequency groups in each frequency range.
In step 306, measure the power of other frequencies except representative frequency in each candidate's frequency group.Like this, the power of all frequencies in candidate's frequency group will be measured.
In addition, for the weak frequency group of all the other power, no longer the power measurement of each frequency is carried out in expansion.But in step 307, the power of the representative frequency in non-candidate's frequency group that the power in a plurality of frequency groups is weak is given other frequencies in this non-candidate's frequency group.That is to say, according to the approximate processing principle, in these non-candidate's frequency groups, the power of all the other frequencies directly equals the group power of frequency group, the i.e. power of representative frequency.
In step 308, according to watt level, each frequency is sorted.
Compare with conventional method, this flow process is due to each frequency power of only having measured in all candidate's frequency groups, and to each non-candidate's frequency group, only measures a representative frequency power, therefore significantly reduced frequency and measured number of times, thereby reduced the time of cost.
As previously described, embodiments of the invention are applicable to TD-SCDMA system in addition.Accordingly, above-mentioned can the execution in the TD-SCDMA terminal also can in the terminal of other standards, for example be carried out in the WCDMA terminal.
With traditional frequency point sequencing method, to compare, the method for the above embodiment of the present invention can significantly reduce the required Measuring Time of frequency sequence.
Still take the TD-SCDMA system as example, present 2010 frequency ranges (2010MHz is to 2025MHz) need to measure 68 frequencies, (1880MHz is to the 1920MHz) of 1900 frequency ranges needs 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 altogether need to measure 261 frequencies, each 5ms needs 1305ms altogether.
Method according to the embodiment of the present invention is described in frequency group measuring phases, needs to measure 53 frequency groups, needs 265ms.Under general environment, suppose to only have near terminal a TD-SCDMA residential quarter, also need measure the power of other frequencies in remaining some frequency groups, representative value is 6 frequency groups, 5 frequencies of each frequency group also need be measured 24 frequencies, need 120ms; Altogether need 385ms.
Only under the most abominable complex environment (its probability of happening is extremely low), namely the TD-SCDMA residential quarter is many especially near terminal, on all frequency groups, signal is arranged, just need to measure 208 frequencies that are left, thus altogether consuming time the same with original method be 1305ms.
So under most environment, the inventive method is compared conventional method, can significantly reduce the needed Measuring Time of frequency sequence.
And above-described embodiment can't significantly be sacrificed because of approximate on processing accuracy.Give an example, suppose every two adjacent frequencies 200KHz of being separated by, frequency N exists two true cell 1 and residential quarter 2 in frequency N+15, as shown in Figure 4, signal strength signal intensity is respectively-80dBm and-77dBm; The 1.28Mcps of TD-SCDMA system, occupied bandwidth 1.28MHz; Under ideal signal, the desirable reception, can know that from following table 1 value and the former methodical value that record under the frequency group are more or less the same, and if under affecting because of noise, decline etc., so little measurement error value is acceptable under actual environment.
Table 1
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can do a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (14)
1. the frequency point sequencing method in a terminal Cell searching comprises the following steps:
A series of frequencies according to frequency permutation to be searched are divided into a plurality of frequency groups, and each frequency group comprises a plurality of adjacent frequencies and described a plurality of adjacent frequency, and one of them is the representative frequency of described frequency group;
Measure the power of the representative frequency in each frequency group as the group power of described frequency group;
Described a plurality of frequency groups are sorted according to group power;
Choose prominent at least one the candidate's frequency group of group from described a plurality of frequency groups;
Measure the power of the frequency beyond representative frequency in each described candidate's frequency group;
With the group power of the non-candidate's frequency group in described a plurality of frequency groups, give other frequencies outside the representative frequency in this non-candidate's frequency group; And
According to watt level, each frequency is sorted.
2. the method for claim 1, is characterized in that, the adjacent frequency number that each frequency group comprises is 2 to 5.
3. the method for claim 1, is characterized in that, the representative frequency in each frequency group is the center frequency point of frequency group.
4. the method for claim 1, is characterized in that, described a series of frequencies are working frequency range that are arranged in terminal.
5. the method for claim 1, is characterized in that, the quantity of described candidate's frequency group is 6.
6. the method for claim 1, is characterized in that, described method is to carry out in the TD-SCDMA terminal.
7. the method for claim 1, is characterized in that, described method is to carry out in the WCDMA terminal.
8. the frequency ordering system in a terminal Cell searching comprises:
Be used for a series of frequencies according to frequency permutation to be searched are divided into the device of a plurality of frequency groups, wherein each frequency group comprises a plurality of adjacent frequencies and described a plurality of adjacent frequency one of them is the representative frequency of described frequency group;
Be used for to measure each frequency group representative frequency power and as the device of the group power of described frequency group;
Be used for the device of described a plurality of frequency groups according to the sequence of group power;
Be used for choosing from described a plurality of frequency groups the device of prominent at least one the candidate's frequency group of group;
The device that is used for the power of the representative frequency of each described candidate's frequency group of measurement frequency in addition;
Be used for the group power with non-candidate's frequency group of described a plurality of frequency groups, give the device of other frequencies outside the representative frequency in this non-candidate's frequency group; And
For the device that each frequency is sorted according to watt level.
9. system as claimed in claim 8, is characterized in that, the adjacent frequency number that each frequency group comprises is 2 to 5.
10. system as claimed in claim 8, is characterized in that, the representative frequency in each frequency group is the center frequency point of frequency group.
11. system as claimed in claim 8 is characterized in that, the quantity of described candidate's frequency group is 6.
12. system as claimed in claim 8 is characterized in that, described a series of frequencies are working frequency range that are arranged in terminal.
13. system as claimed in claim 8 is characterized in that, is to be combined in the TD-SCDMA terminal.
14. system as claimed in claim 8 is characterized in that, is to be combined in the WCDMA terminal.
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| CN201110413969.8A CN103167585B (en) | 2011-12-13 | 2011-12-13 | Frequency point sequencing method in terminal cell search and system |
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| CN201110413969.8A CN103167585B (en) | 2011-12-13 | 2011-12-13 | Frequency point sequencing method in terminal cell search and system |
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| CN104811993A (en) * | 2014-01-29 | 2015-07-29 | 联芯科技有限公司 | Frequency point measuring method |
| CN106559857A (en) * | 2016-10-17 | 2017-04-05 | 华为技术有限公司 | A kind of method and device of priori frequency sequence |
| WO2019153786A1 (en) * | 2018-02-09 | 2019-08-15 | 深圳市道通智能航空技术有限公司 | Data transmission method, device and system |
| WO2020215190A1 (en) * | 2019-04-22 | 2020-10-29 | 华为技术有限公司 | Method and apparatus for determining signal quality information of frequency point |
| 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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Cited By (8)
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| CN104811993A (en) * | 2014-01-29 | 2015-07-29 | 联芯科技有限公司 | Frequency point measuring method |
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| CN106559857A (en) * | 2016-10-17 | 2017-04-05 | 华为技术有限公司 | A kind of method and device of priori frequency sequence |
| CN106559857B (en) * | 2016-10-17 | 2020-05-08 | 华为技术有限公司 | Method and device for sequencing prior frequency points |
| WO2019153786A1 (en) * | 2018-02-09 | 2019-08-15 | 深圳市道通智能航空技术有限公司 | Data transmission method, device and system |
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| 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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