CN103167585B - Frequency point sequencing method in terminal cell search and system - Google Patents
Frequency point sequencing method in terminal cell search and system Download PDFInfo
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- CN103167585B CN103167585B CN201110413969.8A CN201110413969A CN103167585B CN 103167585 B CN103167585 B CN 103167585B CN 201110413969 A CN201110413969 A CN 201110413969A CN 103167585 B CN103167585 B CN 103167585B
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Abstract
The present invention relates to the frequency point sequencing method in a kind of terminal cell search and system, to reduce in frequency sequence the time of measuring power and spending.The method comprises the following steps: to be searched is divided into multiple frequency group according to a series of frequencies of frequency permutation, each frequency group comprise multiple adjacent frequency and described multiple adjacent frequency one of them be the representative frequency of described frequency group; Measure the group power of power as described frequency group of the representative frequency in each frequency group; By described multiple frequency group according to the sequence of group power; Group at least one candidate's frequency group prominent is chosen from described multiple frequency group; Measure the power of the frequency in candidate's frequency group described in each beyond representative frequency; By the group power of the non-candidate frequency group in described multiple frequency group, give other frequencies outside the representative frequency in this non-candidate frequency group; And according to watt level, each frequency is sorted.
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 (UserEquipment, UE) needs to search the community that may exist, and selects suitable cell registration.Only after UE signs in community, the more detailed information in this community can be obtained and obtain the information of adjacent cell, also only after signing in community, just can monitor paging or make a call.Usually from start, to search the procedure definition signing in suitable cell be cell initial searching process.
With 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, from the frequency that power is the strongest, carry out the subsequent process of Cell searching.Due to when starting shooting, terminal does not also know the timing of network, so terminal must receive the signal of a subframe, just can know the power of a frequency.Current search frequency the method for sequence is that each frequency receives a complete sub-frame data and carries out power measurement, and travels through all frequencies.The shortcoming of this method is, each frequency power measurement needs the time of a subframe (5ms), and the time cost traveling 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 Measuring Time required for frequency sequence.
The present invention is that to solve the problems of the technologies described above the technical scheme adopted be the frequency point sequencing method proposed in a kind of terminal cell search, comprise the following steps: to be searched is divided into multiple frequency group according to a series of frequencies of frequency permutation, each frequency group comprise multiple adjacent frequency and described multiple adjacent frequency one of them be the representative frequency of described frequency group; Measure the group power of power as described frequency group of the representative frequency in each frequency group; By described multiple frequency group according to the sequence of group power; Group at least one candidate's frequency group prominent is chosen from described multiple frequency group; Measure the power of the frequency in candidate's frequency group described in each beyond representative frequency; By the group power of the non-candidate frequency group in described multiple frequency group, give other frequencies outside the representative frequency in this non-candidate frequency group; And according to watt level, each frequency is sorted.
In one embodiment of this invention, the adjacent frequency number that each frequency group comprises 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 the working frequency range being 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 performs in TD-SCDMA terminal.
In one embodiment of this invention, described method performs in WCDMA terminal.
The present invention separately proposes the frequency ordering system in a kind of terminal cell search, comprising:
For a series of frequencies according to frequency permutation to be searched being divided into the device of multiple frequency group, wherein each frequency group comprise multiple adjacent frequency and described multiple adjacent frequency one of them be the representative frequency of described frequency group;
For measuring the device of the power of the representative frequency in each frequency group the group power as described frequency group;
For the device that described multiple frequency group is sorted according to group power;
For choosing the device organizing at least one candidate's frequency group prominent from described multiple frequency group;
For measuring the device of the power of the frequency in candidate's frequency group described in each beyond representative frequency;
For the group power by the non-candidate frequency group in described multiple frequency group, give the device of other frequencies outside the representative frequency in this non-candidate frequency group; And
For the device sorted to each frequency 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 owing to only need measure in the stronger candidate's frequency group of power few in number, and the non-candidate frequency group more weak to each power, only measure a representative frequency power, therefore significantly reduce frequency pendulous frequency, thus reduce the time of cost.
Accompanying drawing explanation
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 frequency point sequencing method that the following examples of the present invention will be described in the Cell searching of mobile communication terminal execution.As an example, mobile communication terminal can comprise the portable electric appts that mobile phone, panel computer etc. have mobile communication module.Embodiment below, will describe implementation process of the present invention for TD-SCDMA system, but be appreciated that and invention can be implemented in other mobile communication system, such as, in WCDMA system.
Fig. 1 illustrates the frame structure of TD-SCDMA system.As shown in Figure 1, the code channel 1,2 of time slot TS0 carries PCCPCH, DwPTS (descending pilot frequency time slot) and carries SYNC_DL.Time slot TS1 to TS6 is business time-slot, bearer service data.TD-SCDMA community inherently sends signal on TS0 and DwPTS.
TD-SCDMA wireless frame length is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.Fig. 2 illustrates the subframe structure of TD-SCDMA system further.As shown in Figure 2, each subframe is divided into again 7 regular 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 regular time slots, TS0 always distributes to down link, and TS1 always distributes to up link.
When TS-SCDMA terminal is just started shooting, need to search and sort to the power of each possible frequency, the some frequencies finding power the strongest carry out Cell searching.In the present invention, by choosing representational frequency, instead of travel through all frequencies to be reduced to frequency sort the measurement carried out time cost.
Fig. 3 illustrates the frequency point sequencing method flow chart of one embodiment of the invention.With reference to shown in Fig. 3, first as step 301, a series of frequencies according to frequency permutation to be searched are divided into multiple frequency group.Each frequency group comprises multiple adjacent frequency.As an example, the quantity of frequency can be 2-5.For simplicity, the frequency number that 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 multiple adjacent frequencies of each frequency group, choose a representative frequency.For example, can be a frequency group with continuous 5 frequencies, in the middle of in frequency group, the measurement power of that frequency be as the group power of this frequency group.At this, think that the power of frequency group other each frequencies interior is equal or close with the power representing frequency approx, in follow-up measurement, will first measure the power of representative frequency.
In actual mobile communication system, terminal may can be operated in multiple frequency range.Therefore the grouping of frequency is carried out respectively for each frequency range.Such as TS-SCDMA system, 2010 frequency ranges (2010MHz to 2025MHz) need measurement 68 frequencies, be a frequency group with continuous 5 frequencies, 14 frequency groups can be divided into, and (1880MHz to the 1920MHz) of 1900 frequency ranges needs measurement 193 frequencies, be a frequency group with continuous 5 frequencies, 39 frequency groups can be divided into.
Then, in step 302-303, the power of the representative frequency in each frequency group is measured, 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, need not travel through all frequencies, and therefore measuring required time will shorten dramatically than traditional approach.
In step 304, by multiple frequency group according to the sequence of group watt level.At this, the index of power can for conventional RSSI.Be understandable that, if be positioned at multiple frequency range in the frequency group measured, sort also respectively for each frequency range in the size of group power.
Then, in step 305, from multiple frequency group, choose group at least one candidate's frequency group prominent.The quantity of candidate's frequency group can expend time in search and compromise between searching accuracy.In general, the quantity of candidate's frequency group is chosen more meeting causes expending the more time, and the quantity of candidate's frequency group and chosen lack may again do not measured some true cell, can need random search from 5 frequencies because there is no more frequency power prior information in follow-up flow process.In one embodiment, consider classical scene, there are 3 communities at central point, each community 1.6MHz, need 2 frequency groups to cover, altogether need 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 in each candidate's frequency group except representative frequency.Like this, the power of all frequencies in candidate's frequency group will be measured.
In addition, for the more 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, by the power of the representative frequency in non-candidate frequency group more weak for the power in multiple frequency group, give other frequencies in this non-candidate frequency group.That is, according to approximate processing principle, in these non-candidate frequency groups, the power of all the other frequencies directly equals the group power of frequency group, i.e. the power of representative frequency.
In step 308, according to watt level, each frequency is sorted.
Compared with conventional method, this flow process owing to only measuring each frequency power in all candidate's frequency groups, and to each non-candidate frequency group, only measures a representative frequency power, therefore significantly reduce frequency pendulous frequency, thus reduce the time of cost.
As previously described, embodiments of the invention are applicable to the system beyond TD-SCDMA.Accordingly, above-mentionedly can to perform in TD-SCDMA terminal, also in the terminal of other standards, such as, can perform in WCDMA terminal.
With traditional frequency point sequencing method, compare, the method for the above embodiment of the present invention significantly can reduce the Measuring Time needed for frequency sequence.
Still for TD-SCDMA system, current 2010 frequency ranges (2010MHz to 2025MHz) need measurement 68 frequencies, (1880MHz to the 1920MHz) of 1900 frequency ranges needs 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, needs 1305ms altogether.
According to the method that the embodiment of the present invention describes, in frequency group measuring phases, need measurement 53 frequency groups, need 265ms.Under general environment, suppose to only have a TD-SCDMA community near terminal, then also need the power measuring other frequencies in remaining some frequency groups, representative value is 6 frequency groups, each frequency group 5 frequencies, then also need measurement 24 frequencies, need 120ms; Altogether need 385ms.
Only under the most severe complex environment (its probability of happening is extremely low), namely near terminal, TD-SCDMA community is many especially, and all frequency groups have signal, just need measure 208 remaining frequencies, thus altogether consuming time the same with original method be 1305ms.
So under most environment, the inventive method compares conventional method, the Measuring Time required for frequency sequence significantly can be reduced.
Further, above-described embodiment significantly can't sacrifice accuracy because of approximate in process.Give an example, suppose that every two adjacent frequencies are separated by 200KHz, in frequency N to frequency N+15, there is two true cell 1 and community 2, as shown in Figure 4, signal strength signal intensity is-80dBm and-77dBm respectively; TD-SCDMA system 1.28Mcps, occupied bandwidth 1.28MHz; Ideal signal, desirable receive under, can know that the value recorded frequency group is more or less the same with former methodical value from following table 1, and if under practical circumstances because under noise, decline etc. affect, measurement error value little is like this acceptable.
Table 1
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (14)
1. the frequency point sequencing method in terminal cell search, comprises the following steps:
To be searched is divided into multiple frequency group according to a series of frequencies of frequency permutation, each frequency group comprise multiple adjacent frequency and described multiple adjacent frequency one of them be the representative frequency of described frequency group;
Measure the group power of power as described frequency group of the representative frequency in each frequency group;
By described multiple frequency group according to the sequence of group power;
Group at least one candidate's frequency group prominent is chosen from described multiple frequency group;
Measure the power of the frequency in candidate's frequency group described in each beyond representative frequency;
By the group power of the non-candidate frequency group in described multiple frequency group, give other frequencies outside the representative frequency in this non-candidate 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 frequency is the working frequency range being 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 performs in TD-SCDMA terminal.
7. the method for claim 1, is characterized in that, described method performs in WCDMA terminal.
8. the frequency ordering system in terminal cell search, comprising:
For a series of frequencies according to frequency permutation to be searched being divided into the device of multiple frequency group, wherein each frequency group comprise multiple adjacent frequency and described multiple adjacent frequency one of them be the representative frequency of described frequency group;
For measuring the device of the power of the representative frequency in each frequency group the group power as described frequency group;
For the device that described multiple frequency group is sorted according to group power;
For choosing the device organizing at least one candidate's frequency group prominent from described multiple frequency group;
For measuring the device of the power of the frequency in candidate's frequency group described in each beyond representative frequency;
For the group power by the non-candidate frequency group in described multiple frequency group, give the device of other frequencies outside the representative frequency in this non-candidate frequency group; And
For the device sorted to each frequency according to watt level.
9. system as claimed in claim 8, it is characterized in that, the adjacent frequency number that each frequency group comprises is 2 to 5.
10. system as claimed in claim 8, it is characterized in that, the representative frequency in each frequency group is the center frequency point of frequency group.
11. systems as claimed in claim 8, is characterized in that, the quantity of described candidate's frequency group is 6.
12. systems as claimed in claim 8, is characterized in that, described a series of frequency is the working frequency range being arranged in terminal.
13. systems as claimed in claim 8, it is characterized in that, be combined in TD-SCDMA terminal.
14. systems as claimed in claim 8, it is characterized in that, be combined in 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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| CN103167585B true CN103167585B (en) | 2015-11-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104811993B (en) * | 2014-01-29 | 2019-01-29 | 联芯科技有限公司 | Frequency point measurement method |
| CN106559857B (en) * | 2016-10-17 | 2020-05-08 | 华为技术有限公司 | Method and device for sequencing prior frequency points |
| CN108390748B (en) * | 2018-02-09 | 2021-07-09 | 深圳市道通智能航空技术股份有限公司 | Data transmission method, device and system |
| JP7263552B2 (en) * | 2019-04-22 | 2023-04-24 | 華為技術有限公司 | Method and apparatus for determining frequency signal quality information |
| 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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| WO2003063538A1 (en) * | 2002-01-21 | 2003-07-31 | Siemens Mobile Communications S.P.A. | Method and mobile station to perform the initial cell search in time slotted systems |
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| CN101959285A (en) * | 2009-07-21 | 2011-01-26 | 上海摩波彼克半导体有限公司 | Method for quickly searching full-band cell in WCDMA (Wideband Code Division Multiple Access) communication system |
| CN102202381A (en) * | 2010-03-26 | 2011-09-28 | 复旦大学 | Method for rapidly scanning frequency point of multiple cells |
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Patent Citations (4)
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| WO2003063538A1 (en) * | 2002-01-21 | 2003-07-31 | Siemens Mobile Communications S.P.A. | Method and mobile station to perform the initial cell search in time slotted systems |
| CN1642337A (en) * | 2004-01-12 | 2005-07-20 | 大唐移动通信设备有限公司 | Quick frequency scanning method for howing estate primary searching |
| CN101959285A (en) * | 2009-07-21 | 2011-01-26 | 上海摩波彼克半导体有限公司 | Method for quickly searching full-band cell in WCDMA (Wideband Code Division Multiple Access) communication system |
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