CN101227204A - Method for searching district frequency - Google Patents
Method for searching district frequency Download PDFInfo
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- CN101227204A CN101227204A CNA2007100365208A CN200710036520A CN101227204A CN 101227204 A CN101227204 A CN 101227204A CN A2007100365208 A CNA2007100365208 A CN A2007100365208A CN 200710036520 A CN200710036520 A CN 200710036520A CN 101227204 A CN101227204 A CN 101227204A
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Abstract
The invention discloses a frequency searching method for a community, wherein the method preferentially carries out community frequency search in a frequency table which contains a serviced community and the adjacent community information which are resided in a user facility, next adaptive community frequency search is accelerated after opening machine or leaving off a service area, therefore the adaptive community frequency can be effectively searched, the time that a user facility is connected to the network is shortened, searching times of the community frequency are reduced, therefore the purpose of electricity saving is achieved.
Description
Technical field
The present invention relates to a kind of method for searching district frequency, relate in particular to a kind of suitable cell frequency search method that is used for mobile communication system.
Background technology
When subscriber equipment in the mobile communication system (UE) is started shooting or after leaving service area, it need be according to the ability search proper cell and resident in the frequency range of supporting of self.And in the prior art, method for searching district frequency generally is by at first searching in the Serving cell that is stored in the resident mistake of mobile information system, if search realizes less than the mode of then carrying out the full range search in the Serving cell, the probability that this method for searching district frequency enters the full range search is very big, therefore the number of times that need search for is more, and the speed that searches the suitable cell frequency is slower.And a kind of small region search method is disclosed at Chinese invention patent specification CN1756435 (on 04 05th, 2006 day for announcing), this method needs to store a plurality of frequency ranges at mobile communication terminal, and be the certain priority of each frequency allocation according to certain rule, according to described priority Cell searching is carried out in the sub-district that belongs to required network then; This method still need search suitable cell at least in a frequency range, therefore can't guarantee that still subscriber equipment can search suitable cell fast after start.And because broadband CDMA system (WCDMA), TDS-CDMA system (TD-SCDMA) or gsm (GSM) are all supported the frequency that number is various, so how subscriber equipment can search the speed that proper cell also is related to subscriber equipment access network speed rapidly after start.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for searching district frequency, can reduce the searching district frequency number of times, search the speed of suitable cell frequency after accelerating the subscriber equipment start or leaving service area, shorten the time of subscriber equipment access network, reach purpose of power saving.
For solving the problems of the technologies described above, the invention provides a kind of method for searching district frequency, comprising:
Preferentially in the list of frequency of Serving cell that comprises the resident mistake of subscriber equipment and adjacent cell information thereof, carry out the search of cell frequency;
When not searching the proper cell frequency, then the whole frequency range in described subscriber equipment support carries out Cell searching.
The present invention is owing to adopted technique scheme, has such beneficial effect, comprise the Serving cell of the resident mistake of subscriber equipment and the list of frequency of adjacent cell information thereof by first search, accelerated to start shooting next time or left the speed that searches the suitable cell frequency behind the service area, shortened the time of subscriber equipment access network, reached purpose of power saving thereby reduced the searching district frequency number of times.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the schematic flow sheet of method for searching district frequency of the present invention;
Fig. 2 is the start flow process of the subscriber equipment according to the present invention and the schematic flow sheet that tabulation is upgraded to first frequency;
Fig. 3 is the schematic flow sheet that subscriber equipment upgrades the second frequency tabulation when powered-down according to the present invention;
Fig. 4 is to the measurement situation schematic diagram of adjacent cell in one embodiment of the present of invention;
Fig. 5 is the second frequency tabulation schematic diagram in one embodiment of the present of invention;
Fig. 6 is the first frequency tabulation schematic diagram in one embodiment of the present of invention;
Fig. 7 is the schematic diagram after first frequency tabulation shown in Figure 6 is upgraded;
Fig. 8 is last postboost the 3rd list of frequency schematic diagram of subscriber equipment in further embodiment of this invention;
Fig. 9 is the resident schematic diagram behind a Serving cell of the 3rd list of frequency shown in Figure 8;
Figure 10 is that the 3rd list of frequency shown in Figure 9 upgrades later schematic diagram in the subscriber equipment process.
Embodiment
Show that according to statistics the probability of starting shooting again at former Serving cell or adjacent cell in subscriber equipment shutdown back is very big.And, in the standard criterion of mobile communication system, require user that it must can under idle pulley (disconnected pattern), possess the monitoring capability of adjacent cell, to check the signal quality of adjacent cell.If the current service cell signal quality is weak, do not reach predetermined threshold value, and the signal strength signal intensity of adjacent cell is when satisfying certain value, subscriber equipment should carry out sub-district gravity treatment and resident on respective cell.Efficient when method for searching district frequency of the present invention has utilized These characteristics to improve Cell searching just.
As shown in Figure 1, start shooting again or leave current Serving cell and need look for when net again when subscriber equipment, method for searching district frequency of the present invention mainly may further comprise the steps:
Preferentially in the list of frequency of Serving cell that comprises the resident mistake of subscriber equipment and adjacent cell information thereof, carry out the search of cell frequency;
When not searching the proper cell frequency, then the whole frequency range in described subscriber equipment support carries out Cell searching.
Embodiment one, method for searching district frequency of the present invention can be stored in first frequency tabulation and in the internal memory of subscriber equipment and is stored in second frequency in the memory cell of described subscriber equipment and tabulates and realize that its concrete grammar is as follows by safeguarding and upgrading one:
As shown in Figure 2, when the subscriber equipment power-on, from the memory cell of subscriber equipment, read current second frequency tabulation, for every record increases signal strength information (S value), and corresponding S value is set to zero, formation first frequency tabulation, then with this first frequency list storage in the internal memory of described subscriber equipment; Search for successively according to the order of this first frequency tabulation then,, then begin in the whole frequency range of subscriber equipment support, to carry out Cell searching if proper cell is not promptly found in the search failure.Wherein, described first frequency tabulation is kept in the internal memory of subscriber equipment, therefore only when described subscriber equipment open state, exist, the information that every record in this first frequency tabulation comprises comprises: the PLMN (PLMN) and the S value of frequency, frequency correspondence, its length is N, can adjust according to the ability of subscriber equipment.Wherein, signal strength signal intensity refers to stipulates suitable cell judgment criteria value, i.e. S value (cell selection criterion S) in the 3GPP agreement.Described second frequency tabulation is kept in the memory device of subscriber equipment, even therefore also can not lose under the situation of power down; The information that every record in this second frequency tabulation comprises comprises: the PLMN of frequency and frequency correspondence, its length is M, can adjust according to UE capability.
When subscriber equipment was in idle pulley, the standard criterion logical according to mobile communication breath can be periodically measured the frequency information of the adjacent cell of described subscriber equipment.Therefore in one embodiment, the frequency information of these frequency informations that measure together with current service cell sorted according to carry out cell frequency from S value order from high to low.During ordering,, then only keep the strongest cell information of S value if there are a plurality of co-frequency cells.Then, the first frequency tabulation that utilizes said frequencies information will be stored in the described subscriber equipment internal memory is upgraded.When upgrading, if the described subscriber equipment frequency information that current period measures under idle pulley include with upgrade before the frequency of frequency information repetition in the first frequency tabulation, then with the record deletion of original frequency, the record of the described frequency information that newly measures is stored in the first frequency tabulation after the renewal.
When if subscriber equipment leaves current service cell, need look for net again, at this moment carry out searching district frequency as follows: search for successively according to the order of the first frequency of current storage in subscriber equipment internal memory tabulation and carry out searching district frequency according to the present invention; If proper cell is not promptly found in the search failure, begin again in the whole frequency range of subscriber equipment support, to search for.
As shown in Figure 3, when the subscriber equipment powered-down, need the second frequency tabulation that is stored in the described subscriber device stores unit is upgraded, its concrete update mode is as follows: the signal strength values of every record removes in the first frequency tabulation of storing in the described subscriber equipment internal memory during with powered-down, but reservation record order, be inserted into the foremost of the memory cell of described subscriber equipment then, form the second frequency tabulation; If before inserting, comprise the repetition rate information of described first frequency tabulation in the current second frequency tabulation of storing in the described memory cell, then repeating part is deleted earlier to guarantee the uniqueness of frequency in whole tabulation; At this moment, if the frequency after inserting has exceeded the described second frequency predefined length of tabulating, the frequency deletion that then will exceed the lowermost end part of described second frequency list length.
The method of search cell frequency of the present invention is described with a concrete example below, is illustrated in figure 4 as the measurement situation of adjacent cell, network condition is universal mobile telecommunications system (UMTS), and other mobile communication system also are feasible.Comprised base station 30 among Fig. 4, subscriber equipment 10 and sub-district 20,21,22,23,24 etc., wherein sub-district 20 and sub-district 21 are subordinated to base station 30.The current service cell of subscriber equipment 10 is sub-districts 20, adopts dotted line to interconnect the relation of representing between them.And the frequency of supposing each sub-district is respectively F0, F1, F2, F3 and F4.
Be illustrated in figure 5 as the second frequency tabulation in the memory cell that is stored in this subscriber equipment 10 after subscriber equipment 10 last shutdown are upgraded, wherein comprise the frequency F3 of sub-district 23, the frequency F4 of sub-district 24, and the frequency F9 of another sub-district etc.
Because this moment, subscriber equipment 10 monitorings were less than sub-district 24, then subscriber equipment 10 is resident behind Serving cell 20, when being in idle pulley, can stipulate according to the 3GPP agreement, periodically the signal of this sub-district and adjacent cell (being sub-district 20,21,22,23) is done measurement, measure their corresponding S values respectively, as being S0, S1, S2, S3 respectively, if its magnitude relationship is S0＞S1＞S2＞S3, then this moment, first frequency was tabulated as shown in Figure 6, and wherein the S value is that 0 record is the frequency that reads from postboost second frequency tabulation of last time.
After subscriber equipment 10 moves to another zone, meeting is search cell again, at this moment mobile communication equipment can carry out Cell searching according to the order of the first frequency tabulation of storing in the current internal memory, suppose this moment gravity treatment arrived sub-district 22, if being equipped with 10, this user this moment under idle pulley, monitored adjacent cell 24 again, and the current S value of its correspondence is S4, and the magnitude relationship of S0-S4 is at this moment: S2＞S1＞S4＞S0＞S3, therefore first frequency tabulation at this moment is updated to as shown in Figure 7.When being first frequency tabulation to Fig. 7 from the first frequency list update of Fig. 6, add new list of frequency (S2, S1, S4, S0 S3) before, need add frequency (S0, S1, S2, S3, S4) deletion that repeats in the frequency original first frequency tabulation neutralization is new.If new frequency of adding has exceeded the first frequency list size, will exceed the frequency deletion (for example F9) of the lowermost end part of this first frequency list length.
When subscriber equipment 10 shutdown, the signal strength signal intensity S value of each bar record in the first frequency tabulation of storing in the current internal memory is arranged to zero, and it is saved in forms second frequency in the storage area of subscriber equipment 10 and tabulate.And when subscriber equipment 10 is started shooting once more, this second frequency tabulation will be read out and form the first frequency tabulation, and search for suitable cell successively according to the frequency order of the F2, the F1 that store, F4, F0, F3.
Embodiment two, and method for searching district frequency of the present invention also can realize that its concrete grammar is as follows by independent the 3rd list of frequency that is stored in the subscriber device stores unit:
When subscriber equipment in the mobile communication system (UE) is started shooting or after leaving service area, order according to the 3rd list of frequency is searched for successively, if proper cell is not promptly found in the search failure, then begin in the whole frequency range of subscriber equipment support, to carry out Cell searching.Wherein, described the 3rd list of frequency is kept in the memory device of subscriber equipment, even therefore under the situation of power down, can not lose yet, the information that every record in the 3rd list of frequency comprises comprises: the PLMN (PLMN) and the S value of frequency, frequency correspondence, its length is N, and N can adjust according to the ability of subscriber equipment.Wherein, signal strength signal intensity refers to stipulates suitable cell judgment criteria value, i.e. S value (cell selection criterion S) in the 3GPP agreement.
When subscriber equipment was in idle pulley, the standard criterion logical according to mobile communication breath can be periodically measured the frequency information of the adjacent cell of described subscriber equipment.Therefore in one embodiment, the frequency information of these frequency informations that measure together with current service cell sorted according to carry out cell frequency from S value order from high to low.During ordering,, then only keep the strongest cell information of S value if there are a plurality of co-frequency cells.Then, utilize said frequencies information that the 3rd list of frequency that is stored in the described subscriber device stores equipment is upgraded.When upgrading, if the described subscriber equipment frequency information that current period measures under idle pulley includes the frequency that repeats with the frequency information that upgrades in preceding the 3rd list of frequency, then with the record deletion of original frequency, the record of the described frequency information that will newly measure stores in the 3rd list of frequency after the renewal again.Cell frequency is according to sorting from S value order from high to low in the 3rd list of frequency after the renewal.
Below the measurement situation of same adjacent cell according to as shown in Figure 4 come above-mentioned method for searching district frequency is further specified by a concrete example:
Be illustrated in figure 8 as the 3rd list of frequency in the memory cell that is stored in this subscriber equipment 10 after the last shutdown of subscriber equipment 10, the frequency F0 that wherein comprises sub-district 20, the frequency F1 of sub-district 21, the frequency F2 of sub-district 22, and the frequency F3 of sub-district 23 etc., its magnitude relationship is S0＞S1＞S2＞S3.
Search for described the 3rd list of frequency and resident successively after these subscriber equipment 10 starts to Serving cell 20, afterwards, when subscriber equipment 10 is in idle pulley, can stipulate according to the 3GPP agreement, periodically the signal of this sub-district and adjacent cell (being sub-district 20,21,22,23) is done measurement, measure their corresponding S values respectively, as being S0, S1, S2, S3 respectively, if its magnitude relationship is S0＞S2＞S3＞S1, then this moment the 3rd list of frequency as shown in Figure 9.
When subscriber equipment 10 start shooting again or deviated from network after, meeting is search cell again, at this moment mobile communication equipment can carry out Cell searching according to the order of the 3rd list of frequency of storing in the current internal memory, suppose this moment gravity treatment arrived sub-district 22, if being equipped with 10, this user this moment under idle pulley, monitored adjacent cell 24 again, and the current S value of its correspondence is S4, and the magnitude relationship of S0-S4 is at this moment: S2＞S1＞S4＞S0＞S3, therefore the 3rd list of frequency at this moment is updated to as shown in figure 10.When the 3rd list of frequency of Fig. 9 is updated to the 3rd list of frequency of Figure 10, adding new the 3rd list of frequency (S2, S1, S4, S0, S3) before, need be in original the 3rd list of frequency and new frequency (S0, the S1 that repeats in the frequency that add, S2, S3, S4) deletion.If new frequency of adding has exceeded the 3rd list of frequency size, will exceed the frequency deletion of the lowermost end part of the 3rd list of frequency length.
Claims (14)
1. a method for searching district frequency is characterized in that, comprising:
Preferentially in the list of frequency of Serving cell that comprises the resident mistake of subscriber equipment and adjacent cell information thereof, carry out the search of cell frequency;
When not searching the proper cell frequency, then the whole frequency range in described subscriber equipment support carries out Cell searching.
2. method for searching district frequency according to claim 1, it is characterized in that, the first frequency of current storage tabulation in subscriber equipment internal memory during described list of frequency fingering row searching district frequency, described first frequency tabulation are to be stored on the basis of the second frequency tabulation in the memory cell of described subscriber equipment to form when described subscriber equipment power-on; And described first frequency tabulation meeting is periodically upgraded according to described subscriber equipment frequency information to measurements of neighboring cells under idle pulley; Wherein, described second frequency list storage and is upgraded when the each powered-down of described subscriber equipment in the memory cell of described subscriber equipment, keeps the Serving cell of the resident mistake of described subscriber equipment before the shutdown and the frequency information of adjacent cell thereof.
3. method for searching district frequency according to claim 2, it is characterized in that, the information that every record of described first frequency tabulation comprises comprises: the PLMN and the signal strength signal intensity of frequency, frequency correspondence, its length is according to the UE capability adjustment.
4. method for searching district frequency according to claim 2 is characterized in that, the information that every record of described second frequency tabulation comprises comprises: the PLMN of frequency and frequency correspondence, its length is according to the UE capability adjustment.
5. according to any described method for searching district frequency in the claim 2 to 4, it is characterized in that, the concrete forming process of described first frequency tabulation is: read the second frequency tabulation in the described subscriber device stores unit, for every record increases signal strength information, and corresponding signal strength values is set to zero, forms described first frequency tabulation.
6. according to any described method for searching district frequency in the claim 2 to 4, it is characterized in that, the update mode of described second frequency tabulation is: the signal strength values of every record removes in the first frequency tabulation of storing in the described subscriber equipment internal memory during with powered-down, but reservation record in proper order, is inserted into the foremost of the memory cell of described subscriber equipment then; If before inserting, comprise the repetition rate information of described first frequency tabulation in the current second frequency tabulation of storing in the described memory cell, then repeating part deletion earlier; If the frequency after inserting has exceeded the described second frequency predefined length of tabulating, the frequency deletion that then will exceed the lowermost end part of described second frequency list length.
7. method for searching district frequency according to claim 2, it is characterized in that, before described first frequency tabulation was upgraded, the frequency information of the adjacent cell that described subscriber equipment need be measured under idle pulley carried out the cell frequency ordering together with the frequency information of current service cell according to the order that signal strength values carries out from high to low.
8. method for searching district frequency according to claim 7 is characterized in that, if when described frequency information is sorted, there are a plurality of co-frequency cell information, and a strongest cell information of stick signal intensity then.
9. method for searching district frequency according to claim 8, it is characterized in that, when described first frequency tabulation is upgraded, if the described subscriber equipment frequency information that current period measures under idle pulley include with upgrade before the frequency of frequency information repetition in the first frequency tabulation, then with the record deletion of original frequency, the record of the described frequency information that newly measures is inserted in the first frequency tabulation after the renewal, if the frequency after inserting has exceeded the length of predefined first frequency tabulation, then will exceed the frequency deletion of the lowermost end part of described first frequency list length.
10. method for searching district frequency according to claim 1, it is characterized in that, described list of frequency refers to be stored in the 3rd list of frequency in the described subscriber device stores unit, and described the 3rd list of frequency can periodically upgrade according to described subscriber equipment frequency information to measurements of neighboring cells under idle pulley.
11. method for searching district frequency according to claim 10, it is characterized in that, the information that every record of described the 3rd list of frequency comprises comprises: the PLMN and the signal strength signal intensity of frequency, frequency correspondence, its length is according to the UE capability adjustment.
12. according to claim 10 or 11 described method for searching district frequency, it is characterized in that the frequency information of the adjacent cell that described subscriber equipment need be measured carries out the cell frequency ordering together with the frequency information of current service cell according to signal strength signal intensity order from high to low under idle pulley before described the 3rd list of frequency upgrades.
13. method for searching district frequency according to claim 12 is characterized in that, if when described frequency information is sorted, there are a plurality of co-frequency cell information, and a strongest cell information of stick signal intensity then.
14. method for searching district frequency according to claim 13, it is characterized in that, when described the 3rd list of frequency upgrades, if the described subscriber equipment frequency information that current period measures under idle pulley includes the frequency that repeats with the frequency information that upgrades in preceding the 3rd list of frequency, then with the record deletion of original frequency, the record of the described frequency information that newly measures is inserted in the 3rd list of frequency after the renewal, if the frequency after inserting has exceeded the length of predefined the 3rd list of frequency, then will exceed the frequency deletion of the lowermost end part of described the 3rd list of frequency length.
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| CNA2007100365208A CN101227204A (en) | 2007-01-17 | 2007-01-17 | Method for searching district frequency |
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| CN101980571A (en) * | 2010-10-13 | 2011-02-23 | 中兴通讯股份有限公司 | Method for accelerating cell search and mobile communication terminal |
| CN102132521A (en) * | 2009-06-30 | 2011-07-20 | 松下电器产业株式会社 | Data exchange processing device and data exchange processing method |
| WO2011147224A1 (en) * | 2010-05-24 | 2011-12-01 | 中兴通讯股份有限公司 | Method for network search after coverage loss and mobile terminal thereof |
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| CN101657003B (en) * | 2009-08-07 | 2011-12-21 | 华为终端有限公司 | Method for searching subdistrict and mobile terminal thereof |
| WO2012024924A1 (en) * | 2010-08-27 | 2012-03-01 | 中兴通讯股份有限公司 | Cell reselection method in time division-synchronous code division multiple access (td-scdma) network and terminal equipment |
| CN101959285B (en) * | 2009-07-21 | 2012-12-26 | 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 |
| CN103152799A (en) * | 2011-12-06 | 2013-06-12 | 联想(北京)有限公司 | Method and terminal for community residing |
| CN103634881A (en) * | 2012-08-22 | 2014-03-12 | 中国移动通信集团公司 | Frequency point searching method and apparatus, and terminal |
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| CN104185260A (en) * | 2013-05-27 | 2014-12-03 | 北京信威通信技术股份有限公司 | Frequency scanning method of wireless terminal |
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- 2007-01-17 CN CNA2007100365208A patent/CN101227204A/en active Pending
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| CN101959285B (en) * | 2009-07-21 | 2012-12-26 | 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 |
| CN101657003B (en) * | 2009-08-07 | 2011-12-21 | 华为终端有限公司 | Method for searching subdistrict and mobile terminal thereof |
| WO2011147224A1 (en) * | 2010-05-24 | 2011-12-01 | 中兴通讯股份有限公司 | Method for network search after coverage loss and mobile terminal thereof |
| WO2012024924A1 (en) * | 2010-08-27 | 2012-03-01 | 中兴通讯股份有限公司 | Cell reselection method in time division-synchronous code division multiple access (td-scdma) network and terminal equipment |
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| CN107548117B (en) * | 2016-06-26 | 2020-05-08 | 联芯科技有限公司 | Network selection method after terminal equipment offline and terminal equipment |
| CN110278021A (en) * | 2018-03-13 | 2019-09-24 | 大唐移动通信设备有限公司 | A kind of update method and gateway station control equipment of dominant frequency point list |
| CN112055398A (en) * | 2020-09-11 | 2020-12-08 | 江西财经大学 | Mobile terminal cell residence method based on historical frequency points |
| CN112055398B (en) * | 2020-09-11 | 2022-07-12 | 江西财经大学 | Mobile terminal cell residence method based on historical frequency points |
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