CN100459814C - Search technique of quickening initial search speed of sector - Google Patents
Search technique of quickening initial search speed of sector Download PDFInfo
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- CN100459814C CN100459814C CNB2006100952113A CN200610095211A CN100459814C CN 100459814 C CN100459814 C CN 100459814C CN B2006100952113 A CNB2006100952113 A CN B2006100952113A CN 200610095211 A CN200610095211 A CN 200610095211A CN 100459814 C CN100459814 C CN 100459814C
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Abstract
The method comprises: building a collected table for saving the system information of cells at user end; when user end starts a cell reselection in the idle mode or in process of switching connection mode to idle mode, once user end reads a candidate cell, it collects the system information and saves it in the collected table; when starting a cell searching again, if the downlink synchronizing code and the cell frequency point of a certain cell has already existed in the collected table, then the system information of the cell no longer needs to be read, and turning to read the system information of next cell, and the like, until reading the system information of all cells.
Description
Technical field
The present invention relates to the initial cell search technology of user terminal higher-layer protocols public land mobile network (abbreviating PLMN as) in the 3-G (Generation Three mobile communication system), particularly user terminal is accelerated initial cell search speed in the TD-SCDMA wireless telecommunication system (abbreviating the TD-SCDMA system as), user terminal is linked into the searching method of the sub-district that is fit in the PLMN network.
Background technology
In the TD-SCDMA system, higher-layer protocols is to be made of Access Layer and Non-Access Stratum, and cell initial search is Radio Resource control (being called for short RRC) the module realization by Access Layer.The user terminal of mobile communication (abbreviating user terminal as) uses mobile communication network or in the process that start is moved, always will search for and log on suitable network sub-district (abbreviating the sub-district as) in start, realizes wireless telecommunications by the sub-district.According to the description of the 3GPP agreement TS25.304 document of TD-SCDMA system, the sub-district that the mobile communication system user terminal is used is always determined by Non-Access Stratum that Access Layer RRC module is searched for proper cell according to specifying in the PLMN network of Non-Access Stratum.If the RRC module does not have signal on the PLMN of appointment network or do not have proper cell to exist, then the RRC module is with triggering cell initial ranging process (abbreviating cell initial search as), and the all-network sub-district that the cell initial search process is searched reports Non-Access Stratum, determine that by Non-Access Stratum a network that priority is the highest sends to the RRC module, the RRC module is carried out cell selecting and gravity treatment once more.Another situation is exactly PLMN network (abbreviating HPLMN as) the search timer expiry of the periodic ownership of Non-Access Stratum, triggering terminal is carried out the PLMN network search procedure of high priority, in this process, Access Layer RRC module will be carried out Cell searching not influencing under the situation of understanding paging.
Be not difficult to find out that cell initial search may frequently take place in web search, and might carry out multiple system information to some sub-districts of a certain network within a short period of time and understand.Usually, the triggering cell situation of just searching has:
When 1, user terminal is started shooting, in common user identification card (abbreviating usim card as), do not preserve the information of the preceding successful residing network of any shutdown.
When 2, user terminal was started shooting, user terminal did not search and is kept at any adjacent cell that can be resident in the usim card, and user terminal will begin the cell initial search process this moment.
When 3, user terminal is in do not have that signal covers regional, user terminal will be opened the search timer of one-period.At timer expiry, user terminal will be initiated the cell initial search process.The length of this timer generally was decided to be about 10 minutes.
When 4, user terminal was in mobile status, Serving cell was unavailable, and the sub-district gravity treatment will take place user terminal this moment, and the sub-district gravity treatment is unsuccessful, and user terminal will carry out the cell initial search process.
5, the PLMN web search timer expiry of the periodic ownership of Non-Access Stratum also carries out the cell initial search process with triggering terminal.
Cell initial search is all radio bands in the search subscriber terminal capability scope, and according to the power of signal, understands its system information from high to low successively.
Usually, cell initial search comprises following five steps:
The first step: the measurement of broadband power, effect are that all frequencies are carried out power measurement one time, find out the frequency of all signals;
Second step: the search of descending guiding time slot (abbreviating DwPTS as), effect are the positions of finding out the down-going synchronous access slot;
The 3rd step: scrambler and training sequence code (be called for short midamble sign indicating number) determine that effect is to find out the midamble sign indicating number that use concrete sub-district;
The 4th step: multi-frame is synchronous, and effect is a phase place of understanding descending synchronous code (abbreviating SYNC-DL as), finds out qualified phase place;
The 5th step: understand Broadcast Control Channel (abbreviating BCCH as) message, effect is PLMN network identity (being made up of Mobile Country Code MCC MCC and mobile network code, MNC MNC) and a Location Area Identification value (abbreviating LAI as) of determining the sub-district, and separates and read the parameter that needs to calculate S (quality of wireless signal transmitting-receiving between this parameter identification user terminal and the cell base station).
When carrying out cell initial search at every turn, all will repeat user terminal five above-mentioned steps.If in a certain area, user terminal can receive the signal of a lot of sub-districts simultaneously, and the parameter of these sub-districts all is not suitable for the resident condition of user terminal, but user terminal will be understood the frequency that all have signal.Therefore, user terminal carries out cell initial search at every turn all will expend long time, and increase power consumption, reduce the stand-by time of user terminal.
Summary of the invention
For overcoming the above-mentioned deficiency of prior art, the present invention proposes a kind of quickening cell initial search speed, user terminal is linked into the searching method of the sub-district that is fit in the PLMN network.At first, set up a collection tabulation (abbreviating collectedTable as) of preserving cell system information at user terminal, when user terminal turns back to the sub-district gravity treatment that idle pulley takes place at idle pulley or from connection mode, candidate cell of the every deciphering of user terminal (being Candidate cells), just this system information of subdistricts is collected, and be kept among the collectedTable, the cell system information of preserving comprises: subdistrict frequency point number, the descending synchronous code that use the sub-district, PLMN network identity (MCC+MNC), Location Area Identification LAI, the sign the barredFlag whether sub-district is prohibited etc.If it is resident that candidate cell all is not suitable for, then show not success of sub-district gravity treatment, then the requirement according to the TD-SCDMA agreement will start the cell initial search process.User terminal is after the measurement of the broadband power that carries out cell initial search, can list a frequency number tabulation (being called arfcnList) that signal is arranged according to the size of power, understand these frequencies then successively, if separating the descending synchronous code of reading certain sub-district and subdistrict frequency point number is present in the collectedTable tabulation, user terminal can no longer be understood this system information of subdistricts so, then separate the read next system information of subdistricts, if the descending synchronous code of this sub-district and subdistrict frequency point number are present among the collectedTable equally, then change over to again and separate the read next system information of subdistricts, by that analogy, only the system information of subdistricts of not understanding is understood, run through the system information of subdistricts that all should be understood up to separating.Make user terminal only the cell system information in collectedTable not be understood like this, avoid user terminal to repeat to understand the situation of having understood cell system information, thereby accelerated the speed that user terminal carries out cell initial search, shortened the required time.
After Access Layer RRC module cell initial search finishes, if do not find proper cell resident, then according to the Location Area Identification among the collectedTable and sub-district whether be under an embargo choose one can be resident the sub-district.At last, also need all PLMN network identities in the collectedTable tabulation are reported Non-Access Stratum.Within the certain hour afterwards, the cell initial search process can not take place once more, because moving of terminal, the residing wireless environment variation of terminal, the collectedTable that collected tabulation can not GC group connector wireless environment of living in, so remove the content of storage in the collectedTable tabulation.
Searching method of the present invention is equally applicable to user terminal HPLMN under idle pulley and searches for the PLMN network search procedure that takes place under the situation of timer expiry.User terminal is understood in the Serving cell system information under idle pulley, the system information of this Serving cell has comprised the system information parameters of adjacent cell, and for example: whether cell frequency number, descending synchronous code, PLMN network identity, subdistrict position district sign, sub-district are under an embargo etc.Equally, Access Layer RRC module is according to the measurement result to adjacent cell of physical layer, can will signal be arranged, and S value (cell selecting standard value, can be with reference to the TS25.304 document in the 3GPP agreement) these informations parameter of meeting resident adjacent cell are kept among the collectedTable, in each Serving cell system information renewal and physical layer reporting measurement data, again the system information of new adjacent cell is replaced the information among the collectedTable, the sub-district of collecting among the collectedTable this moment be exactly Serving cell the signal neighbor cell list arranged.During HPLMN under idle pulley search, can not understand the system information of subdistricts of listing among the collectedTable equally, accelerate the speed that user terminal carries out the PLMN web search, shorten the required time.After the PLMN web search finishes, Access Layer RRC module reports Non-Access Stratum with the PLMN network list that searches out among the collectedTable, and use meets resident adjacent cell and reinitializes the collectedTable tabulation, waits for HPLMN search timer expiry next time.
Searching method of the present invention is equally applicable to manually search network process.
As previously mentioned, the situation that triggering cell is just searched is diversified, the cell initial search that searching method of the present invention is suitable for triggering in any case so long as the last cell system information of understanding all can be kept among the collectedTable, is avoided repeating understanding.For example: the cell system information in that sub-district gravity treatment or cell selecting stage were understood all will be stored among the collectedTable.If sub-district gravity treatment or cell selecting be success (not finding the normally resident of proper cell) not, user terminal will carry out the cell initial search process immediately this moment, and in this process, user terminal just can not understood these system information of subdistricts once more.Under idle pulley, high priority HPLMN search also is same reason, the information such as frequency point number, descending synchronous code that has comprised adjacent cell in the system information of Serving cell, and physical layer is periodically measured, when so Access Layer RRC module is carried out the HPLMN search of high priority again, there is no need to understand the system information that these have the signal adjacent cell once more, thereby improved the speed of HPLMN search.
Description of drawings
Understand the flow chart of sub-district in Fig. 1, the prior art searching method cell reselection process.
Understand the flow chart of sub-district in Fig. 2, the searching method cell reselection process of the present invention.
The flow chart of Fig. 3, prior art searching method PLMN search.
The flow chart of Fig. 4, searching method PLMN of the present invention search.
From Fig. 1 and Fig. 2 relatively as can be seen, searching method of the present invention has increased a process of collecting cell system information, the cell system information of collecting can be kept in the global variable that is arranged at collectedTable in the user terminal, this is a structure variable, content comprises: subdistrict frequency point number, descending synchronous code, PLMN network identity (MCC+MNC), the Location Area Identification LAI that use the sub-district, the sign the barredFlag whether sub-district is prohibited etc.If cell initial search has taken place after this, then can not understand once more and be kept at these system information of subdistricts in the collectedTable table, otherwise remove the content of storage in this collectedTable tabulation.
From Fig. 3 and Fig. 4 relatively as can be seen, in Fig. 4, increased and checked whether the descending synchronous code of being understood the sub-district is present among the collectedTable, if in the collectedTable tabulation, then do not need to understand once more this system information of subdistricts.If do not understand, then need to understand its system information, obtain the PLMN network identity of this sub-district, Location Area Identification, sub-district information such as whether be under an embargo.Need to prove that the sub-district among the situation collectedTable of the PLMN web search of high priority is not to understand the sub-district from user terminal, but from the system information of understanding in the Serving cell.
Searching method of the present invention also can have other various embodiments; under the situation of spirit that does not deviate from searching method of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes or distortion according to searching method of the present invention, but these corresponding changes or distortion all belong to the claim protection range of searching method of the present invention.
Claims (4)
1, a kind of searching method of accelerating wireless telecommunications user terminal network initial cell search speed, user terminal is understood the system information of the network cell that can search according to the frequency bandwidth of TD-SCDMA system, land to seek the suitable network sub-district, it is characterized in that: set up a collection tabulation collectedTable who preserves the network cell system information at user terminal, the system information of a network cell of the every deciphering of user terminal, all the system information of this network cell or the adjacent network system information of subdistricts that system information comprised of this network cell are collected and are kept among the collection tabulation collectedTable, when TD-SCDMA system requirements user terminal carries out the network cell initial ranging once more, if separating the descending synchronous code of reading certain network cell and subdistrict frequency point number is present in and collects among the tabulation collectedTable, just no longer understand the system information of this network cell, then the system information of separating the read next network cell, the rest may be inferred, only the system information of the network cell do not understood is understood, up to separating the system information that runs through all network cells that should understand, after the network cell initial ranging finishes, user terminal will collect the tabulation collectedTable in all PLMN network identities report Non-Access Stratum, and, remove and collect the content of storing among the tabulation collectedTable.
2, according to the described searching method of claim 1, it is characterized in that: collect the network cell system information that tabulation collectedTable preserves and comprise: subdistrict frequency point number, the sign barredFlag whether descending synchronous code, PLMN network identity MCC+MNC, Location Area Identification LAI and the sub-district that use the sub-district is prohibited.
3, according to the described searching method of claim 1, it is characterized in that: when the gravity treatment of user terminal turns back at idle pulley or from connection mode that idle pulley takes place sub-district or the cell system information that carries out when successfully not starting initial cell search or during the PLMN web search that takes place under the situation of user terminal HPLMN search timer expiry under idle pulley of sub-district gravity treatment understand, all the cell system information of understanding can be collected and be kept at and collect among the tabulation collectedTable, avoid the deciphering that repeats the network cell system information.
4, according to the described searching method of claim 1, it is characterized in that when the PLMN web search that takes place under the situation of user terminal HPLMN search timer expiry under idle pulley, the system information parameters of the adjacent cell that the subscriber terminal service system information of subdistricts is comprised or the system information parameters that will meet the adjacent cell of resident condition are kept at collects among the tabulation collectedTable, in each Serving cell system information renewal and physical layer reporting measurement data, again the system information of new adjacent cell is replaced the information of collecting among the tabulation collectedTable, avoid the deciphering that repeats of network cell system information.
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| CNB2006100952113A CN100459814C (en) | 2006-11-16 | 2006-11-16 | Search technique of quickening initial search speed of sector |
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| CN100459814C true CN100459814C (en) | 2009-02-04 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101072438B (en) * | 2007-06-15 | 2010-09-29 | 中兴通讯股份有限公司 | A method for initial cell search by mobile terminal in TD-SCDMA system |
| CN101540623B (en) * | 2008-03-21 | 2012-12-19 | 傲世通科技（苏州）有限公司 | Method for initial cell search in TD-SCDMA system and device therefor |
| CN101547484B (en) * | 2008-03-26 | 2010-12-29 | 上海摩波彼克半导体有限公司 | Method for realizing cell re-selection by mobile device in mobile communication system |
| JP5081753B2 (en) * | 2008-07-15 | 2012-11-28 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile station and mobile communication method |
| CN101715233B (en) * | 2008-10-08 | 2012-10-17 | 华为技术有限公司 | Method, device and system for allocating scrambling codes |
| CN101572927B (en) * | 2009-06-12 | 2011-04-06 | 华为终端有限公司 | Cell reselection method, apparatus and system thereof |
| CN102461270B (en) * | 2009-06-26 | 2015-03-25 | 诺基亚公司 | Systems, methods, and apparatuses for facilitating handover to closed subscriber group cells |
| CN101707783B (en) * | 2009-06-30 | 2012-02-15 | 重庆重邮信科通信技术有限公司 | Method for searching high priority network by user terminal of third generation mobile communication system |
| CN102137461B (en) * | 2010-01-26 | 2015-02-04 | 上海摩波彼克半导体有限公司 | Method for maintaining reselected target cell in wireless communication system |
| US8301145B2 (en) * | 2010-06-24 | 2012-10-30 | Apple Inc. | Fast cell selection in a mobile wireless device |
| CN106470463A (en) * | 2015-08-19 | 2017-03-01 | 中兴通讯股份有限公司 | A kind of method and device looking for net |
| CN106550431B (en) * | 2015-09-22 | 2021-02-09 | 联芯科技有限公司 | UTRAN PLMN searching method |
| CN105611583B (en) * | 2016-02-22 | 2019-03-22 | 重庆邮电大学 | A method of shortening multimode user terminal and searches net network selection time delay |
| CN110913458B (en) * | 2019-12-10 | 2021-12-24 | 重庆邮电大学 | Optimized network selection and cell selection method and user terminal |
| CN112235848B (en) * | 2020-10-14 | 2022-08-16 | 展讯通信（上海）有限公司 | Network searching method, device, terminal and storage medium |
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Effective date of registration: 20170427 Address after: Nanping Street 400060 Chongqing Nan'an District Nancheng Road No. 199 left attached to the floor 403 Patentee after: Keen (Chongqing) Microelectronics Technology Co., Ltd. Address before: 400065 Chongqing Nan'an District huangjuezhen pass Fort Park No. 1 Patentee before: Chongqing City Communication & Technology Co., Ltd. |