CN100356811C - A method for searching adjacent base stations by terminals in synchronous CDMA system - Google Patents
A method for searching adjacent base stations by terminals in synchronous CDMA system Download PDFInfo
- Publication number
- CN100356811C CN100356811C CNB2004100388121A CN200410038812A CN100356811C CN 100356811 C CN100356811 C CN 100356811C CN B2004100388121 A CNB2004100388121 A CN B2004100388121A CN 200410038812 A CN200410038812 A CN 200410038812A CN 100356811 C CN100356811 C CN 100356811C
- Authority
- CN
- China
- Prior art keywords
- frequency
- base station
- terminal
- neighbor base
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention provides a method for a mobile terminal to automatically search for an adjacent frequency base station in a synchronous code division multiple access system (SCDMA). An adjacent frequency table can be established through the steps of the rough concentration of frequency points and the concentration of the frequency points; in the process of the rough concentration of the frequency points, the terminal searches for all legal frequency points to initially obtain the distribution condition of the power of positions where the legal frequency points are positioned in the terminal; in the process of the concentration of the frequency points, a plurality of frequency points with high power are taken for concentration, and frequency points with high synchronous head power are obtained to form the adjacent frequency table, wherein the terminal is locked back to an original frequency point during the receiving time slot of a base station, so, the damage to voices in conversation is minimum, and the effect is good.
Description
Technical field
The present invention relates to the method for mobile terminal to search neighbor base station in the cellular mobile communication, relate in particular to the method for mobile terminal to search neighbor base station in synchronization code multi-address division system (SCDMA).
Background technology
In cell mobile communication systems, when portable terminal is crossed over the different cell boarders that the base station covered, need sign in in time on the new base station.If portable terminal is crossed over different base station overlay areas in conversation, then need to keep conversation and in time be linked on the new base station.Realize this two processes, portable terminal all needs the neighbor base station signal is monitored under standby or talking state, and covers the switching that the border receives frequency fast in the base station.Because the network more complicated that the base station overlap to cover, therefore, the problem that the institute that how to carry out neighbor base station frequency monitoring fast and accurately and be insuring telecommunication service quality must solution.
For realizing supervision to neighbor base station frequency (hereinafter to be referred as " frequently adjacent "), the mode that existing cellular system (comprising CDMA) is taked is: at first, each base station is carried out being each base station configuration neighbor base station frequency meter (hereinafter to be referred as " adjacent table frequently ") after the Frequency Distribution in the network planning stage.Like this, when portable terminal signed in to new base station and handover, the base station issued adjacent table frequently by channel associated signalling and gives terminal, as the foundation of monitor adjacent frequency in standby and the communication process.Adjacent table frequently is a class frequency information combination table, and all there is different adjacent tables frequently each base station, is generated according to the geographical position manual configuration of base station by the engineering staff in the network planning stage.It is exactly to show medium frequency information locking phase with reference to adjacent frequency to answer frequency that terminal is carried out monitor adjacent frequency, receives its signal power of calculated signals of certain time length, locks back the process of current working frequency again.
Yet there is certain weak point in prior art solutions.When the network more complicated,, and be difficult to accurately corresponding with the base station signal of terminal seat point actual reception according to the adjacent table frequently of geographical position configuration for the work complexity of the adjacent table frequently of each base station configuration is very high.
At present, synchronization code multi-address division system (SCDMA) has been proposed, this system is a tdd systems, rely on frequency to distinguish different base station cells, all base station transceiver time slots are that strictness is determined synchronous according to global positioning system (GPS), mobile phone keeps and base station synchronization according to the reception and the sending time slots of the synchronous head adjustment mobile phone of the base station that receives.
Summary of the invention
The invention provides a kind ofly in synchronization code multi-address division system (SCDMA), do not issue adjacent table frequently when portable terminal is crossed over the sub-district and obtain neighbor base station information by the base station, but the adjacent base station frequently of own search fast and monitor the adjacent method of base station frequently.
The method of mobile terminal to search neighbor base station in the synchronization code multi-address division system of the present invention may further comprise the steps:
Step 1: portable terminal carries out the short time reception at other frequencies that the base station time slot locks onto apace with respect to current working frequency, and calculate this frequency power, obtain legal frequencies all in the synchronization code multi-address division system performance number of 1 symbol separately by this method;
Step 2: after the performance number of 1 symbol sorts separately to all legal frequencies in the synchronization code multi-address division system that is obtained by step 1, obtain the bigger top n frequency of power;
Step 3: for each frequency in the N that obtains by step 2 frequency, carry out the receiving course of the synchronism head of X frame, by power ratio and synchronous head confirm to obtain the adjacent frequency that M the bigger and legal frequency of synchronous head power constitute terminal and show;
Step 4: portable terminal monitors the neighbour frequently according to the adjacent table frequently that is drawn.
Preferably, the N value is according to the value that obtains a compromise after the statistical analysis of experiment image data.
Preferably, the X value is according to the value that obtains a compromise after the statistical analysis of experiment image data.
Preferably, M frequency be for to carry out X frame scan to N frequency, removes the frequency points after none frame of X frame reaches the frequency that synchronous head satisfies condition.
More preferably, terminal is got back to current working frequency at base station receiving slot lock.
In the synchronous time-division duplex code division multiple address communication system, above solution provided by the present invention can make portable terminal pass through the base station that own rapid frequency-sweeping is determined vicinity, and it is monitored.Owing to no longer including the adjacent process of table frequently of configuration, frequently do not show the problem that bad configuration brings owing to adjacent with regard to having had yet, simplified the process of the network planning.It is more reasonable to adopt the method that definite reposition is upgraded.Terminal makes to speech damage minimum, better effects if by lock back current working frequency more rapidly after locking onto frequently adjacent and receiving synchronous head.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is a mobile base station working time slot schematic diagram;
Fig. 2 is the corresponding relation schematic diagram of frequency locking and time slot during the portable terminal roughing separation frequency;
Fig. 3 is the corresponding relation schematic diagram of frequency locking and time slot during the selected frequency of portable terminal.
Embodiment
Below be example with synchronization code multi-address division system with 40 frequencies, specifically describe the method that rapid frequency-sweeping when portable terminal is crossed over the sub-district in the synchronous time-division duplex code division multiple address communication system is determined neighbor base station.
The inventive method comprises the process of roughing separation frequency and selected frequency:
Roughing separation frequency process:
Usually, mobile terminal to lock fixes on the frequency work of certain fixed base stations.In the roughing separation frequency process, portable terminal carries out the short time reception at other frequencies that the base station time slot locks onto apace with respect to current working frequency, and calculates this frequency power to determine whether it is neighbor base station.
Fig. 1 is a mobile base station working time slot schematic diagram.Usually, terminal is 360us to stable data are arranged from the length the most in short-term that the AD input enters from frequency locking, near the time span that receives 5 symbols.Behind frequency of every locking, need to receive its power of Time Calculation of 1 symbol at least.Add up, each frequency has calculated from locking onto to receive, and needs the time span of 6 symbols at least.Synchronization code multi-address division system adopts the working method of time division duplex, and length launch time of base station is 60 symbols in the every frame of system.
The corresponding relation schematic diagram of frequency locking and time slot during the roughing separation frequency shown in Figure 2, all accurate for guaranteeing to the reception and the calculating of each frequency, and each frame changes the relatively equilibrium of number of times of frequency, can be with the time span of 5 frames, every frame successively locks 8 frequencies, finishes the search to 40 all in synchronization code multi-address division system frequencies.
Through roughing separation frequency process, terminal tentatively obtains all legal frequencies (the radio committee distributes to the frequency in the used band limits of SCDMA system) may be in the distribute power situation of terminal present position, for example pass through the coarse scan frequency, obtain 40 frequencies performance number of 1 symbol separately, after ordering, obtain the bigger top n frequency of power.The N value is too big, causes the process of smart frequency sweep oversize and do not have a too many practical significance; The N value is too little, is that legal neighbor base station was just missed in the stage of roughly selecting originally because the roughing separation frequency rated output exists error to cause.According to experimental result, obtain a value of relatively compromising after the image data statistical analysis and be applied to reality.
In addition, terminal is got back to current working frequency at base station receiving slot lock and is continued transmit uplink signal, and airlink can not interrupt in this monitor adjacent frequency process, therefore can not cause disconnected words.
Selected frequency process:
The necessity of selected frequency: it is omnidirectional that the signal of base station inserts code channel, and inserts synchronous head power than other high 6dB of power partly.During roughing separation frequency, not all base station all synchronism head receives, and power calculation is not on same horizontal line, and obviously error is bigger.In addition, leak because base station transmitting power exists, portable terminal receives also to exist and leaks, and whether the process of roughing separation frequency can not be distinguished is to leak the frequency signal or the frequency signal of real base station.Therefore, be necessary to carry out selected to frequency.
As shown in Figure 3, portable terminal is successively to the monitoring process of N frequency through the smart frequency sweep point of X frame.This process is carried out the receiving course of the synchronism head of X frame for each frequency in the N that is obtained by the roughing separation frequency process frequency, by power ratio and synchronous head confirm to obtain the adjacent frequency that M the bigger and legal frequency of synchronous head power constitute terminal and show.
Selected frequency adopts the synchronism head to receive, and makes all frequency power calculation all on same horizontal line, and calculates synchronous head and whether satisfy condition to determine with descending pseudo random sequence (PN) yard correlation peak whether the target frequency is true frequency.The data that terminal receives are relevant with descending PN sequence, and its maximum shows to have tangible relevant peaks greater than 8 times that receive data auto-correlation mean value, is synchronous head and satisfies condition.
Wherein, if the X value is too little,, may will be that legal neighbor base station is missed originally because aerial signal randomness causes synchronometer not calculate accurately really more greatly; The X value is too big, because the synchronous head signal that selected frequency process terminal can't receive former base station is adjusted synchronously, may cause the synchronous head signal of the former base station of lost terminal, the obvious variation of the sound effect that perhaps causes terminal to converse at this moment.According to experimental result, obtain a value of relatively compromising after the image data statistical analysis and be applied to reality.A statistics X frame synchronization relevant peaks result calculated, if none frame of X frame reaches synchronous head and satisfies condition that (data that terminal receives are relevant with descending PN sequence, its maximum is greater than 8 times of reception data auto-correlation mean value, show and have tangible relevant peaks, being synchronous head satisfies condition), determine that this frequency is false frequency, do not charge in the adjacent table frequently of target.Add up the synchronous head performance number that M frequency (after removing false frequency) X frame essence is swept, the line ordering of going forward side by side obtains the adjacent frequency that M the sufficiently high frequency of real power value monitors as need as required.
Afterwards, portable terminal monitors the neighbour through roughly selecting the adjacent table frequently that draws with selected step frequently according to it.
In addition, terminal needs to lock back rapidly current working frequency after locking onto frequently adjacent and receiving synchronous head.Like this, if terminal during conversing, it is as much as possible little during the neighbour selects frequently sound effect to be influenced meeting so.
Claims (5)
1. the method for mobile terminal to search neighbor base station in the synchronization code multi-address division system is characterized in that this method may further comprise the steps:
Step 1: portable terminal carries out the short time reception at other frequencies that the base station time slot locks onto apace with respect to current working frequency, and calculate this frequency power, obtain legal frequencies all in the synchronization code multi-address division system performance number of 1 symbol separately by this method;
Step 2: after the performance number of 1 symbol sorts separately to all legal frequencies in the synchronization code multi-address division system that is obtained by step 1, obtain the bigger top n frequency of power;
Step 3: for each frequency in the N that obtains by step 2 frequency, carry out the receiving course of the synchronism head of X frame, by power ratio and synchronous head confirm to obtain the adjacent frequency that M the bigger and legal frequency of synchronous head power constitute terminal and show;
Step 4: portable terminal monitors according to the frequency of the adjacent table frequently that is drawn to neighbor base station.
2. the method for mobile terminal to search neighbor base station as claimed in claim 1 is characterized in that, the N value is according to the value that obtains a compromise after the statistical analysis of experiment image data.
3. the method for mobile terminal to search neighbor base station as claimed in claim 1 is characterized in that, the X value is according to the value that obtains a compromise after the statistical analysis of experiment image data.
4. the method for mobile terminal to search neighbor base station as claimed in claim 1 is characterized in that, M frequency be for to carry out X frame scan to N frequency, removes the frequency points after none frame of X frame reaches the frequency that synchronous head satisfies condition.
5. as the method for each described mobile terminal to search neighbor base station of claim 1-4, it is characterized in that terminal is got back to current working frequency at base station receiving slot lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100388121A CN100356811C (en) | 2004-04-30 | 2004-04-30 | A method for searching adjacent base stations by terminals in synchronous CDMA system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100388121A CN100356811C (en) | 2004-04-30 | 2004-04-30 | A method for searching adjacent base stations by terminals in synchronous CDMA system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1691815A CN1691815A (en) | 2005-11-02 |
| CN100356811C true CN100356811C (en) | 2007-12-19 |
Family
ID=35346877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100388121A Expired - Fee Related CN100356811C (en) | 2004-04-30 | 2004-04-30 | A method for searching adjacent base stations by terminals in synchronous CDMA system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100356811C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471716B (en) * | 2007-12-26 | 2012-10-17 | 京信通信系统（中国）有限公司 | Method for searching base station carrier frequency point of GSM directly-amplifying station |
| CN110012466A (en) * | 2019-04-12 | 2019-07-12 | 国网河北省电力有限公司邢台供电分公司 | Lock the method, apparatus and terminal device of home base stations |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000003501A1 (en) * | 1998-07-13 | 2000-01-20 | Infineon Technologies North America Corp. | Method and aparatus for performing an inter-frequency search |
| CN1248137A (en) * | 1998-06-25 | 2000-03-22 | 三星电子株式会社 | Method for setting search window size for mobile station in cellular |
| US20030104849A1 (en) * | 2001-11-30 | 2003-06-05 | Kazuhiro Arimitsu | Power saving method for a mobile terminal |
| US20030153290A1 (en) * | 2002-02-14 | 2003-08-14 | Mitsubishi Denki Kabushiki Kaisha | Frequency selection method and receiver |
| CN1444807A (en) * | 2000-10-06 | 2003-09-24 | 韩唯逻辑公司 | Preamble searching apparatus and method |
-
2004
- 2004-04-30 CN CNB2004100388121A patent/CN100356811C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248137A (en) * | 1998-06-25 | 2000-03-22 | 三星电子株式会社 | Method for setting search window size for mobile station in cellular |
| WO2000003501A1 (en) * | 1998-07-13 | 2000-01-20 | Infineon Technologies North America Corp. | Method and aparatus for performing an inter-frequency search |
| CN1444807A (en) * | 2000-10-06 | 2003-09-24 | 韩唯逻辑公司 | Preamble searching apparatus and method |
| US20030104849A1 (en) * | 2001-11-30 | 2003-06-05 | Kazuhiro Arimitsu | Power saving method for a mobile terminal |
| US20030153290A1 (en) * | 2002-02-14 | 2003-08-14 | Mitsubishi Denki Kabushiki Kaisha | Frequency selection method and receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1691815A (en) | 2005-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102170680B (en) | Method and apparatus for coordinating radio activities | |
| US6272122B1 (en) | Pilot PN offset assigning method for digital mobile telecommunications system | |
| US7085570B2 (en) | Handover method, system and radio network controller | |
| US7019691B1 (en) | Method and apparatus for beacon discovery in a spread spectrum cellular radio communication system | |
| EP1304897A1 (en) | Methods and apparatus for providing data for enabling location of a mobile communications device | |
| CN1192531C (en) | Synchronous realizing method of broad band CDMA system | |
| CA2269178C (en) | Method and apparatus for determining whether a wireless station is operating within a prescribed geographic region | |
| CN100593931C (en) | Frame synchronization and scrambling code identification in wireless communications systems and methods therefor | |
| US20070116166A1 (en) | Pilot scrambling enabling direct pilot sequence detection in initial acquisition in evolved UTRA | |
| CN102740350A (en) | Indoor positioning method, device and system | |
| US6205132B1 (en) | Method for accessing a cell using two pilot channels in a CDMA communication system of an asynchronous or quasi-synchronous mode | |
| CN101730129B (en) | Method, device and system for measuring Inter-RAT system | |
| CN110890909B (en) | Beam searching method for 5G NR initial access process | |
| GB2370193A (en) | Intelligent optimisation in a cellular telecommunications network | |
| CN100356811C (en) | A method for searching adjacent base stations by terminals in synchronous CDMA system | |
| US11051265B2 (en) | Method and device for synchronization between base stations | |
| KR100645941B1 (en) | Hand off device and method from asynchronous system to synchronous system | |
| CN1797990B (en) | Method for scanning frequency points in TDS-CDMA system | |
| US7317895B2 (en) | Method of controlling a satellite communication system, a timing unit, and a control unit of a timing unit | |
| CN101677450A (en) | Method and device for switching cells and communication system thereof | |
| CN101843149B (en) | Method for a more efficient search for radio network access points for closed groups in radio access networks | |
| CN102131303B (en) | 3G (Third Generation) Moblie physical layer of device radio resource maintenance system framework and method | |
| CN100441051C (en) | Communication method of public network privat network two-standby of personal mobile phone system terminal | |
| KR100735301B1 (en) | Set maintenance method and apparatus for a mobile terminal in a mobile communication | |
| KR100695249B1 (en) | Method and System for Hand-Over Using Radio Trace Technique in Mobile Telecommunication Environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20191121 Granted publication date: 20071219 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20200710 Granted publication date: 20071219 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071219 Termination date: 20200430 |