CN101848520A - Method for realizing cell reselection of mobile equipment in mobile communication system - Google Patents
Method for realizing cell reselection of mobile equipment in mobile communication system Download PDFInfo
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Abstract
The invention relates to a method for realizing the cell reselection of mobile equipment in a mobile communication system, which comprises the following steps of: performing initialization operation and acquiring the information of an internal memory module; performing a cell selection process and recording a measurement result; establishing and maintaining a neighboring cell information database; and detecting current battery power, and if the current battery power is lower than a threshold preset by a system, performing cell reselection detection processing and a subsequent cell reselection process in a low-power state. The method for realizing the cell reselection of the mobile equipment in the mobile communication system greatly reduces the fluctuation of a neighboring cell sequence caused by the change of a measurement level, accelerates the judgment of the cell reselection, reduces the power consumption of the system in a discontinuous reception (DRX) state, avoids frequent cell reselection caused by the fluctuation of the level further causing power consumption loss under the condition of the relatively lower power of the equipment, lays a solid foundation for the further development of modern mobile communication technology, and has the advantages of relatively higher success ratio, stable and reliable working performance and relatively wider application range.
Description
Technical field
The present invention relates to wireless communication field, particularly mobile device cell selecting technical field in the wireless communication system is meant that specifically mobile device is realized method of cell reselection in a kind of mobile communication system.
Background technology
In wireless mobile communications GSM (digital cellular mobile communication systems) system of operation at present, network carries out omnibearing covering with honeycomb style, after mobile device selects certain sub-district to be current service cell, change under the little situation in various conditions, mobile device will reside in the selected sub-district, finish the cell selecting process.After this, mobile device will continue the network coverage of monitoring in the current environment, comprise Serving cell that mobile device is stationed and some adjacent sub-districts around it.In gsm system, Serving cell can be by the various types of system informations of broadcasting of its BCCH (Broadcast Control Channel) channel cycle, wherein just comprised the needed adjacent subdistrict frequency point allocation list of sub-district gravity treatment, mobile device will be monitored the bcch carrier that is present in the subdistrict frequency point allocation list.
Mobile device need be measured the bcch carrier of adjacent sub-district, measurement to their incoming levels needs 5 measurement sampling points to average at least, and tackle all bcch carriers and get same sampling point number, and the sampling point of distributing to each carrier wave each measuring period the planted agent average as far as possible, in per minute, upgrade 6 the strongest carrier waves at least.Simultaneously mobile device also comprises the task of measuring present Serving cell bcch carrier in the routine measurement program, requires at least the whole system messages that the BCCH of Serving cell broadcasts of attempting to decode 30 seconds planted agents; At least the bcch carrier to 6 adjacent sub-districts the strongest carries out the decoding of BCCH all data blocks in 5 minutes, and this data sub-district comprises the parameter that influences the sub-district gravity treatment.constantly measure and decode procedure in, if mobile device recognizes a new BCCH carrier frequency when having become one of 6 carrier frequency that level is the strongest, these BCCH carrier frequency data should can decode in 30s.At least all attempting to detect the BSIC (BCC) of the strongest non-service cell BCCH carrier frequency of 6 level every 30 seconds mobile phones, is same sub-district with what confirm that it is monitored.If BSIC changes, this carrier frequency will be regarded as new carrier frequency, thereby read the BCCH data again.In above situation, MS does not interrupt intercepting PCH (Paging Control Channel) as far as possible.If when the process that monitors adjacent sub-district finds to satisfy the sub-district reselection conditions, mobile device will be initiated reuse adoption process.
The path loss criterion of parameters C 1 for being stationed for the sub-district, the C1 of Serving cell must be greater than 0, and its formula is as follows:
C1＝RXLEV-RXLEV_ACCESS_MIN-MAX((MS_TXPWR_MAX_CCH-P)，0)
Unit: dBm
Wherein:
● RXLEV is the average level that travelling carriage receives
● the minimum incoming level of RXLEV_ACCESS_MIN for allowing travelling carriage to insert
● spendable maximum transmit power level when MS_TXPWR_MAX_CCH is the travelling carriage connecting system
● P is the peak power output of travelling carriage
If do not find proper cell yet after 30 radio-frequency channels the strongest are all searched, then mobile device will continue all RF channels of monitoring, search C1 is greater than 0 and the Broadcast Control Channel (BCCH) that is not under an embargo and inserts, after finding this carrier wave, mobile device will be stationed this sub-district, and do not consider public mobile communication net (PLMN) information, this moment, mobile device was only supported urgent call.
Simultaneously, the algorithm that the sub-district gravity treatment is adopted is the C2 algorithm, and computing formula is as follows:
When PT is not equal to 11111:
C2＝C1+CRO-TO×H(PT-T)
When PT equals 11111:
C2＝C1-CRO
Wherein:
PT:PENALTYTIME is a Penalty time;
CRO:CELL RESELECT OFFSET is the cell reselection offset amount;
TO:TEMPORARY OFFSET is interim side-play amount;
Wherein when X＞0, function H (x)=0; As X＜O, function H (x)=1;
T is a timer, its initial value is 0, when certain sub-district is moved platform and is recorded in six adjacent sub-districts of signal level maximum, then counter T that should the sub-district is picked up counting, when removed from six adjacent sub-district tables of mobile station signal level maximum this sub-district, corresponding timer T was reset; Find the signal appearance of a certain sub-district from mobile device after, the value that timer T begins to be set to timer T will be given the correction of a negative bias of C2 algorithm of this sub-district according to the defined value of TEMPORARY OFFSET before arriving the PENALTYTIME official hour, and this way is to be used for preventing selecting a microcellulor or covering the situation of less sub-district as Serving cell during in fast moving when travelling carriage.If surpass the signal of still receiving this sub-district in the time; Otherwise,, will not consider interim side-play amount if the time has surpassed PENALTY TIME after the defined time.Here it should be noted that, only this Several Parameters of C2 algorithm just works when sub-district gravity treatment indication (CELL RESELECTION INDICATION) activates, otherwise travelling carriage will not considered the situation that is provided with of CELL_RESELECT OFFSET, TEMPORARY OFFSET and PENALTYTIME, thus this moment C2=C1.
When following situation takes place, with triggering cell gravity treatment (if the un-activation still of C2 algorithm, then C2=C1):
(1) travelling carriage calculates the C2 value continuous 5s of the C2 value of certain sub-district (belonging to the same position district with current area) above the travelling carriage current service cell.
(2) travelling carriage calculates C2 value and sub-district gravity treatment lagged value (CELL SELECTION HYSTERESIS) the sum continuous 5s of the C1 value of certain sub-district (not belonging to same lane place with current area) above the travelling carriage current service cell.If in 15s before this, the sub-district gravity treatment is arranged then the sub-district gravity treatment does not take place immediately.
(3) current service cell is under an embargo
(4) travelling carriage is monitored out downlink failure.
The downlink signaling fault criteria is based on downlink signaling failure counter DSC, when mobile station in selecting during certain sub-district, DSC is changed to [90/BS_PA_MFRMS] and rounds, BS_PA_MFRMS gives 51TDMA frame multi-frame number between the same paging group MS for the base station transmits paging information.Therefore when travelling carriage will be deciphered on its paging subchannel, if success then DSC adds 1, if failure, DSC subtracted 4, when DSC is 0, then concludes the downlink signaling fault to have occurred.
(5) the continuous 5s of C1 value of Serving cell is less than 0.
When (6) mobile phone inserts at random, under the still unsuccessful situation of access attempts after the maximum retransmit.
Under the situation that the sub-district reselection conditions satisfies, mobile device should carry out the BCCH all data blocks decodes to the Target cell of gravity treatment, and when condition satisfied, mobile device just carried out gravity treatment.
Can imagine, when mobile device has been in the situation of low electric weight, if still carry out the detection and the realization of sub-district gravity treatment according to present traditional operation, even if can find better sub-district is stationed, but frequent level fluctuation, such as the monitored cells number of variations among the TOP6, sub-district ordering changes or the like, and will slattern the only battery allowance of current mobile device measuring operation, simultaneous operation and the decoding BCCH channel data block operations etc. of the sub-district that changes.
In sum, adopt traditional residence reselecting inapplicable for the mobile device that is in low electric weight.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of and can carry out effectively under mobile device is in the state of low electric weight that cell selecting operation, success rate are higher, efficient energy-saving, stable and reliable working performance, the scope of application comparatively widely in the mobile communication system mobile device realize method of cell reselection.
In order to realize above-mentioned purpose, mobile device realizes that method of cell reselection is as follows in the mobile communication system of the present invention:
Mobile device is realized method of cell reselection in this mobile communication system, and its main feature is that described method may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and obtains the information in the storage inside module;
(2) mobile device carries out the cell selecting process and writes down measurement result;
(3) mobile device is set up and the maintaining information of adjacent cells database;
(4) mobile device detects current battery electric quantity, if be lower than the thresholding of systemic presupposition, then mobile device hangs down sub-district gravity treatment detection processing and follow-up cell reselection process under the state of charge.
Mobile device is realized the cell selecting process of carrying out in the method for cell reselection and is write down measurement result in this mobile communication system, is specially:
Carry out the cell selecting process according to cell selecting algorithm default in the mobile device system, and write down the full range band measurement result in this cell selecting process.
Mobile device is realized foundation and the maintaining information of adjacent cells database in the method for cell reselection in this mobile communication system, may further comprise the steps:
(11) carry out cell selecting success after, obtain the adjacent cell list that is comprised in the Serving cell system information, each sub-district in this adjacent cell list is measured;
(12) obtain the result of the measurement of each sub-district in this adjacent cell list, and write down current timestamp;
(13) measure level value according to the frequency of each sub-district in the measurement result this result is carried out descending sort, and the selection level value is the strongest and sub-district not selected mistake is a Target cell;
Whether (14) detect this Target cell has finished synchronously;
(15) if do not finish synchronously, then this Target cell is carried out synchronizing process; And whether successful, if synchronizing process is unsuccessful, then directly return above-mentioned steps (13) if detecting synchronizing process;
(16) if this Target cell has been finished synchronously or the synchronizing process success, judge then whether this Target cell needs updating system information;
(17) if do not need updating system information, then directly return above-mentioned steps (13);
(18) updating system information is if desired then carried out the system information renewal process;
(19) whether the detection system information updating is successful, if unsuccessful, then directly returns above-mentioned steps (13);
(20) if system information is upgraded successfully, then this Target cell is joined in the information of adjacent cells database, and return above-mentioned steps (13);
(21) if there is not the not sub-district of selected mistake in the above-mentioned steps (13), then return above-mentioned steps (4).
The information that comprises in each sub-district in the adjacent cell list in this mobile communication system in the mobile device realization method of cell reselection is absolute frequency point number and main scrambler.
The sub-district gravity treatment detects and handles and follow-up cell reselection process under the low state of charge in this mobile communication system in the mobile device realization method of cell reselection, may further comprise the steps:
(31) on the activationary time of each noncontinuity reception (DRX, Discontinuous Reception), Serving cell is measured, and obtained its measurement result;
(32) judge whether this Serving cell is effective, if not, then go to step (35); If then check the system information that whether needs to upgrade this Serving cell;
(33) if not, then return above-mentioned steps (31); If then carry out the system information renewal process of this Serving cell;
(34) judge whether the system information of this Serving cell is effective; If then return above-mentioned steps (31);
(35) if not, then each sub-district in the described information of adjacent cells database is measured, and obtained measurement result;
(36) carry out the processing of obtaining of gravity treatment Target cell;
(37), then carry out the cell selecting process again if do not get access to the gravity treatment Target cell;
(38) if get access to the gravity treatment Target cell, then carry out the sub-district reselection operation;
(39) if reselection operation success in sub-district then finishes; Otherwise this gravity treatment Target cell is rejected from the information of adjacent cells database, and return above-mentioned steps (36).
Mobile device realizes that the measurement result in the method for cell reselection comprises the absolute frequency point number of Serving cell, main scrambler and measures level value in this mobile communication system.
Mobile device is realized judging that whether this Serving cell is effective, may further comprise the steps in the method for cell reselection in this mobile communication system:
(321) judge whether the measurement level value of this Serving cell is not less than the level value of systemic presupposition;
(322) if then return the effective result of this Serving cell;
(323) if not, then return the invalid result of this Serving cell.
In this mobile communication system mobile device realize in the method for cell reselection the gravity treatment Target cell obtain processing, may further comprise the steps:
(41) judge in the measurement result of each sub-district in the information of adjacent cells database whether have effective measurement result;
(42) if there is no, then return the result who does not get access to the gravity treatment Target cell;
(43) if exist, then the measurement level value of each sub-district in the information of adjacent cells database is arranged according to descending;
(44) measure the gravity treatment priority that level value is provided with each sub-district in the information of adjacent cells database according to the frequency of each sub-district in the described full range band measurement result;
(45), then select the highest sub-district of gravity treatment priority as the gravity treatment Target cell, and return if there is effective gravity treatment priority;
(46) if there is no effective gravity treatment priority is then selected to measure the highest sub-district of level value as the gravity treatment Target cell, and is returned.
Mobile device is realized the gravity treatment priority that each sub-district in the information of adjacent cells database is set in the method for cell reselection in this mobile communication system, may further comprise the steps:
(51), then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district if measured sub-district exists in the information of adjacent cells database;
(52), then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district, and this gravity treatment priority is lower than gravity treatment priority set in the above-mentioned steps (51) if measured sub-district does not exist in the information of adjacent cells database.
Mobile device realizes that the system information of the renewal in the method for cell reselection comprises the system-frame skew, measures level value and searching position in this mobile communication system.
Adopted in the mobile communication system of this invention mobile device to realize method of cell reselection, because mobile device has been safeguarded the information of adjacent cells database when electric weight is enough, when the lower and Serving cell of electric weight still can be kept, stopped supervision to adjacent sub-district, greatly reduced because of measuring level and changed the fluctuation of the neighbor cell ordering that causes, and then reduced the measurement that is monitored neighbor cell, synchronously and the operation of obtaining whole system informations; And when Serving cell can not continue to keep, in time start supervision to adjacent sub-district, and according to the information of the information of adjacent cells database of safeguarding, quicken the judgement of sub-district gravity treatment, success rate is higher, the noncontinuity that has significantly reduced simultaneously system receives the power consumption under (DRX) state, and avoided hanging down the power consumption penalty that causes owing to the frequent gravity treatment in the sub-district that level fluctuation caused under the situation at the equipment electric weight, stable and reliable working performance, the scope of application are comparatively extensive, for further developing of present mobile communication technology established solid foundation.
Description of drawings
Fig. 1 is the overall flow figure that mobile device is realized method of cell reselection in the mobile communication system of the present invention.
Fig. 2 is that information of adjacent cells database in the mobile device realization method of cell reselection is set up the also flow chart of maintenance process in the mobile communication system of the present invention.
Fig. 3 is the flow chart that sub-district gravity treatment detection is handled under the low state of charge in the mobile device realization method of cell reselection in the mobile communication system of the present invention.
Fig. 4 realizes the flow chart of the gravity treatment Target cell process of looking in the method for cell reselection from the information of adjacent cells database for mobile device in the mobile communication system of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also Fig. 1 to shown in Figure 4, mobile device is realized method of cell reselection in this mobile communication system, and its main feature is that described method may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and obtains the information in the storage inside module;
(2) mobile device carries out the cell selecting process and writes down measurement result, is specially:
Carry out the cell selecting process according to cell selecting algorithm default in the mobile device system, and write down the full range band measurement result in this cell selecting process;
(3) mobile device is set up and the maintaining information of adjacent cells database, may further comprise the steps:
(a) carry out cell selecting success after, obtain the adjacent cell list that is comprised in the Serving cell system information, each sub-district in this adjacent cell list is measured; The information that comprises in each sub-district in the described adjacent cell list is absolute frequency point number and main scrambler;
(b) obtain the result of the measurement of each sub-district in this adjacent cell list, and write down current timestamp;
(c) measure level value according to the frequency of each sub-district in the measurement result this result is carried out descending sort, and the selection level value is the strongest and sub-district not selected mistake is a Target cell;
Whether (d) detect this Target cell has finished synchronously;
(e) if do not finish synchronously, then this Target cell is carried out synchronizing process; And whether successful, if synchronizing process is unsuccessful, then directly return above-mentioned steps (c) if detecting synchronizing process;
(f) if this Target cell has been finished synchronously or the synchronizing process success, judge then whether this Target cell needs updating system information;
(g) if do not need updating system information, then directly return above-mentioned steps (c);
(h) updating system information is if desired then carried out the system information renewal process; The system information of being upgraded comprises the system-frame skew, measures level value and searching position;
(i) whether the detection system information updating is successful, if unsuccessful, then directly returns above-mentioned steps (c);
(j) if system information is upgraded successfully, then this Target cell is joined in the information of adjacent cells database, and return above-mentioned steps (c);
(k) if there is not the not sub-district of selected mistake in the above-mentioned steps (c), then continue following steps (4);
(4) mobile device detects current battery electric quantity, if be lower than the thresholding of systemic presupposition, then mobile device hangs down sub-district gravity treatment detection processing and follow-up cell reselection process under the state of charge, may further comprise the steps:
(a) on the activationary time of each noncontinuity reception (DRX, Discontinuous Reception), Serving cell is measured, and obtained its measurement result; Mobile device realizes that the measurement result in the method for cell reselection comprises the absolute frequency point number of Serving cell, main scrambler and measures level value in this mobile communication system;
(b) judge whether this Serving cell is effective, if not, then go to step (e); If then check the system information that whether needs to upgrade this Serving cell; Judge that wherein whether this Serving cell is effective, may further comprise the steps:
(i) judge whether the measurement level value of this Serving cell is not less than the level value of systemic presupposition;
(ii) if then return the effective result of this Serving cell;
(iii) if not, then return the invalid result of this Serving cell;
(c) if not, then return above-mentioned steps (a); If then carry out the system information renewal process of this Serving cell;
(d) judge whether the system information of this Serving cell is effective; If then return above-mentioned steps (a);
(e) if not, then each sub-district in the described information of adjacent cells database is measured, and obtained measurement result;
(f) carry out the processing of obtaining of gravity treatment Target cell, may further comprise the steps:
(i) judge in the measurement result of each sub-district in the information of adjacent cells database whether have effective measurement result;
(ii) if there is no, then return the result who does not get access to the gravity treatment Target cell;
If (iii) exist, then the measurement level value of each sub-district in the information of adjacent cells database arranged according to descending;
(iv) measure the gravity treatment priority that level value is provided with each sub-district in the information of adjacent cells database, may further comprise the steps according to the frequency of each sub-district in the described full range band measurement result:
● if measured sub-district exists in the information of adjacent cells database, then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district;
● if measured sub-district does not exist in the information of adjacent cells database, then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district, and this gravity treatment priority is lower than gravity treatment priority set in the previous step;
If (v) have effective gravity treatment priority, then select the highest sub-district of gravity treatment priority as the gravity treatment Target cell, and return;
(vi) if there is no effective gravity treatment priority is then selected to measure the highest sub-district of level value as the gravity treatment Target cell, and is returned;
(g), then carry out the cell selecting process again if do not get access to the gravity treatment Target cell;
(h) if get access to the gravity treatment Target cell, then carry out the sub-district reselection operation;
(i) if reselection operation success in sub-district then finishes; Otherwise this gravity treatment Target cell is rejected from the information of adjacent cells database, and return above-mentioned steps (f).
In the middle of reality was used, mobile device was realized the method for cell reselection under the low state of charge in this mobile communication system, may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and obtains the information in the storage inside module, beginning step S100;
(2) carry out the cell selecting process after, execution in step S101, the record measurement result, detailed process will be described hereinafter;
(3) according to the measurement result of S101 record, execution in step S102 sets up and the maintaining information of adjacent cells database.The information that the information of adjacent cells database comprises adjacent sub-district has: absolute frequency point number, main scrambler and measurement level value (as RSSI (indication of received signal intensity), RSCP (received signal code energy) etc.);
(4) execution in step S103 detects the current device battery electric quantity, if be lower than the thresholding of setting, then equipment enters into low electric weight gravity treatment detected state.Threshold value is decided according to the realization of current device detection algorithm, and threshold value is big more, and then the mobile device loss is just little;
(5) execution in step S104, choosing the sub-district of measuring the level value maximum from adjacent cell list is Target cell, carries out follow-up cell reselection process.
Mobile device is realized the cell selecting process of carrying out in the method for cell reselection and is write down measurement result in this mobile communication system, is specially:
Carry out the cell selecting process according to cell selecting algorithm default in the system of mobile device, and write down the full range band measurement result in this cell selecting process.
Foundation and maintaining information of adjacent cells database in the method for cell reselection in this mobile communication system under the low state of charge of mobile device realization are specially:
Foundation also safeguards that the prerequisite of this information of adjacent cells database is that present bit enters low electric weight sub-district gravity treatment detecting pattern, according to the adjacent cell list that is provided in the system information, to its BCCH operation of carrying out synchronously, decode, specifically may further comprise the steps respectively:
(1) execution in step S200 carries out the success of cell selecting and cell selecting;
(2) execution in step S201 obtains the adjacent cell list that is comprised in the Serving cell system information, and each sub-district in this tabulation is measured.The information that comprises in the adjacent sub-district has: absolute frequency point number, main scrambler etc.;
(3) measurement result of acquisition step S201, execution in step S202 writes down current timestamp.The information that comprises adjacent sub-district in the measurement result of each adjacent sub-district has: absolute frequency point number, main scrambler and measurement level value.Measure level value according to the frequency of each sub-district in the measurement result this result is carried out descending sort;
(4) execution in step S203 judges whether there is efficient cell in the measurement result.If have then execution in step S204, otherwise execution in step S212;
(5) if judging, step S203 has efficient cell, execution in step S204 then, and level value the strongest sub-district in constituency is a Target cell from adjacent cell list;
Whether (6) execution in step S205 detects the current goal sub-district and has finished synchronously, if not, then it is started synchronizing process S206, otherwise execution in step S208;
(7) if step S205 testing result is asynchronous, then execution in step S206 carries out synchronously Target cell;
(8) execution in step S207, whether detect synchronizing process successful, if success then enters step S208, otherwise execution in step S211;
(9) if step S207 testing result is success synchronously, execution in step S208, judge whether the current goal sub-district needs updating system information, and criterion is: whether Target cell has new system information etc.Updating system information if desired, execution in step S209 then, otherwise return step S203;
(10) need updating system information if step S208 judges demonstration, then execution in step S209 carries out system information to Target cell and upgrades.The system information of upgrading includes: the system-frame skew, measure level value and searching position etc.;
(11) execution in step S210 judges whether successful system information is upgraded.If system information is upgraded successfully, execution in step S203 then, otherwise execution in step S211;
(12) unsuccessful if step S210 system information is upgraded, then Target cell is rejected from adjacent cell list;
(13) if there has not been efficient cell in the adjacent cell list, then execution in step S212 is that cell reselection process returns;
(14) after step S206 synchronizing process finished, whether execution in step S207 judged successful synchronously.If success synchronously, execution in step S207 then, otherwise execution in step S211;
Be the low electric weight sub-district gravity treatment detection method in the method for cell reselection under the low state of charge of mobile device realization in this mobile communication system below, may further comprise the steps:
(1) execution in step S300 begins to carry out the sub-district gravity treatment under the low state of charge of mobile device realization in this mobile communication system;
(2) execution in step S301 measures Serving cell on each DRX activationary time, obtains its measurement result.Comprise in the measurement result: absolute frequency point number, main scrambler and measurement level value etc.;
(3) the measurement level value that obtains according to step S301, execution in step S302; Judge whether Serving cell is enough good, if not, execution in step S306, if, execution in step S303 then;
(4) enough good if measure level value, then carry out S303, further whether inspection needs the update service cell system information, if desired, execution in step S304, otherwise return step S301;
(5) execution in step S304 finishes system information and upgrades, and updated information comprises: the system-frame skew, measure level value and searching position etc.;
(6) execution in step S305 judges whether the Serving cell system information is effective.If effectively, then return step S301, restart to detect, otherwise execution in step S306;
(7) if the Serving cell system information is invalid, execution in step S306 then.Sub-district in the adjacent cell list is measured;
(8) execution in step S307, search gravity treatment Target cell;
(9) execution in step S308 judges whether the target re-selecting cell exists, if having execution in step S309, otherwise execution in step S312; Criterion is: whether the absolute frequency point number in the target re-selecting cell information, main scrambler, RSCP (received signal code power) etc. exist or effectively;
(10) if the gravity treatment Target cell exists, then execution in step S309 carries out the sub-district gravity treatment, introduces in Fig. 4;
(11) execution in step S310 judges whether the sub-district gravity treatment is successful, if unsuccessful, execution in step S311, otherwise execution in step S313;
(12) if S310, the Target cell gravity treatment is unsuccessful, then execution in step S311 rejects Target cell from adjacent cell data base, returns step S307;
(13) if step S308 judges that Target cell does not exist, then execution in step S312 begins the cell selecting process;
(14) step S312 end or Target cell gravity treatment are unsuccessful, and then execution in step S313 finishes cell reselection process;
Method for the acquisition gravity treatment Target cell in the method for cell reselection under the low state of charge of mobile device realization in this mobile communication system may further comprise the steps below:
(1) execution in step S400, beginning is the acquisition gravity treatment Target cell in the method for cell reselection under the low state of charge of mobile device realization in this mobile communication system;
(2) execution in step S401 obtains the measurement result in the adjacent cell list, should include among the result: absolute frequency point number, main scrambler and measurement level value etc.;
(3) execution in step S402 judges whether measurement result exists effective result, if exist, and execution in step S403, otherwise carry out S409;
(4) have effective measurement result if step S402 judges, execution in step S403 then carries out descending sort according to the measurement level value of each adjacent sub-district in the measurement result to this result;
(5) execution in step S404 measures level value according to the frequency of each sub-district in the described full range band measurement result, determines the measurement priority of each sub-district in the described neighbor cell list.Priority set up standard for: exist in adjacent cell list if record the sub-district, then be provided with first level according to the level value of measuring.If there is no, then the priority with this sub-district row should be lower than the priority that is present in adjacent sub-district, and the priority between these sub-districts also sorts according to level value;
(6) execution in step S405 judges whether to exist preferential gravity treatment target, if exist, and execution in step S407 then, otherwise execution in step S406;
(7) if preferential gravity treatment target does not exist, then execution in step S406 selects the highest sub-district of measured value as the gravity treatment Target cell;
(8) if preferential gravity treatment target exists, then execution in step S407 selects the highest sub-district of priority as the gravity treatment Target cell;
(9) execution in step S408 finds Target cell, returns success;
(10) do not have effective measurement result if step S402 judges, then execution in step S409 does not find Target cell, returns failure.
Adopted the method for cell reselection under the low state of charge of mobile device realization in the above-mentioned mobile communication system, owing to when electric weight is enough, safeguarded the information of adjacent cells database, when the lower and Serving cell of electric weight still can be kept, stopped supervision to adjacent sub-district, greatly reduced because of measuring level and changed the fluctuation of the neighbor cell ordering that causes, and then reduced the measurement that is monitored neighbor cell, synchronously and the operation of obtaining whole system informations; Simultaneously when Serving cell can not continue to keep, in time start supervision to adjacent sub-district, and according to the information of the information of adjacent cells database of safeguarding, quicken the judgement of sub-district gravity treatment, success rate is higher, the loss of having avoided under the low situation of equipment electric weight, attempting unnecessary gravity treatment and having caused dump energy, the service time of having improved mobile device greatly.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (10)
1. mobile device is realized method of cell reselection in the mobile communication system, it is characterized in that described method may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and obtains the information in the storage inside module;
(2) mobile device carries out the cell selecting process and writes down measurement result;
(3) mobile device is set up and the maintaining information of adjacent cells database;
(4) mobile device detects current battery electric quantity, if battery electric quantity is lower than the thresholding of systemic presupposition, then mobile device hangs down sub-district gravity treatment detection processing and follow-up cell reselection process under the state of charge.
2. mobile device is realized it is characterized in that method of cell reselection in the mobile communication system according to claim 1, describedly carries out the cell selecting process and writes down measurement result, is specially:
Carry out the cell selecting process according to cell selecting algorithm default in the mobile device system, and write down the full range band measurement result in this cell selecting process.
3. mobile device is realized method of cell reselection in the mobile communication system according to claim 2, it is characterized in that described foundation and maintaining information of adjacent cells database may further comprise the steps:
(11) carry out cell selecting success after, obtain the adjacent cell list that is comprised in the Serving cell system information, each sub-district in this adjacent cell list is measured;
(12) obtain the result of the measurement of each sub-district in this adjacent cell list, and write down current timestamp;
(13) measure level value according to the frequency of each sub-district in the measurement result this result is carried out descending sort, and the selection level value is the strongest and sub-district not selected mistake is a Target cell;
Whether (14) detect this Target cell has finished synchronously;
(15) if do not finish synchronously, then this Target cell is carried out synchronizing process; And whether successful, if synchronizing process is unsuccessful, then directly return above-mentioned steps (13) if detecting synchronizing process;
(16) if this Target cell has been finished synchronously or the synchronizing process success, judge then whether this Target cell needs updating system information;
(17) if do not need updating system information, then directly return above-mentioned steps (13);
(18) updating system information is if desired then carried out the system information renewal process;
(19) whether the detection system information updating is successful, if unsuccessful, then directly returns above-mentioned steps (13);
(20) if system information is upgraded successfully, then this Target cell is joined in the information of adjacent cells database, and return above-mentioned steps (13);
(21) if there is not the not sub-district of selected mistake in the above-mentioned steps (13), then return above-mentioned steps (4).
4. mobile device is realized method of cell reselection in the mobile communication system according to claim 3, it is characterized in that the information that comprises in each sub-district in the described adjacent cell list is absolute frequency point number and main scrambler.
5. mobile device is realized method of cell reselection in the mobile communication system according to claim 3, it is characterized in that, the sub-district gravity treatment detects and handles and follow-up cell reselection process under the described low state of charge, may further comprise the steps:
(31) on the activationary time that each noncontinuity receives, Serving cell is measured, and obtained its measurement result;
(32) judge whether this Serving cell is effective, if not, then go to step (35); If then check the system information that whether needs to upgrade this Serving cell;
(33) if not, then return above-mentioned steps (31); If then carry out the system information renewal process of this Serving cell;
(34) judge whether the system information of this Serving cell is effective; If then return above-mentioned steps (31);
(35) if not, then each sub-district in the described information of adjacent cells database is measured, and obtained measurement result;
(36) carry out the processing of obtaining of gravity treatment Target cell;
(37), then carry out the cell selecting process again if do not get access to the gravity treatment Target cell;
(38) if get access to the gravity treatment Target cell, then carry out the sub-district reselection operation;
(39) if reselection operation success in sub-district then finishes; Otherwise this gravity treatment Target cell is rejected from the information of adjacent cells database, and return above-mentioned steps (36).
6. mobile device is realized method of cell reselection in the mobile communication system according to claim 5, it is characterized in that, described measurement result comprises the absolute frequency point number of Serving cell, main scrambler and measures level value.
7. mobile device is realized it is characterized in that method of cell reselection in the mobile communication system according to claim 6, describedly judges that whether this Serving cell is effective, may further comprise the steps:
(321) judge whether the measurement level value of this Serving cell is not less than the level value of systemic presupposition;
(322) if then return the effective result of this Serving cell;
(323) if not, then return the invalid result of this Serving cell.
8. mobile device is realized it is characterized in that method of cell reselection in the mobile communication system according to claim 5, described gravity treatment Target cell obtain processing, may further comprise the steps:
(41) judge in the measurement result of each sub-district in the information of adjacent cells database whether have effective measurement result;
(42) if there is no, then return the result who does not get access to the gravity treatment Target cell;
(43) if exist, then the measurement level value of each sub-district in the information of adjacent cells database is arranged according to descending;
(44) measure the gravity treatment priority that level value is provided with each sub-district in the information of adjacent cells database according to the frequency of each sub-district in the described full range band measurement result;
(45), then select the highest sub-district of gravity treatment priority as the gravity treatment Target cell, and return if there is effective gravity treatment priority;
(46) if there is no effective gravity treatment priority is then selected to measure the highest sub-district of level value as the gravity treatment Target cell, and is returned.
9. mobile device is realized method of cell reselection in the mobile communication system according to claim 5, it is characterized in that the described gravity treatment priority that each sub-district in the information of adjacent cells database is set may further comprise the steps:
(51), then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district if measured sub-district exists in the information of adjacent cells database;
(52), then should according to measuring level value gravity treatment priority be set from high to low in measured sub-district, and this gravity treatment priority is lower than gravity treatment priority set in the above-mentioned steps (51) if measured sub-district does not exist in the information of adjacent cells database.
10. realize method of cell reselection according to mobile device in each described mobile communication system in the claim 3 to 9, it is characterized in that the system information of described renewal comprises the system-frame skew, measures level value and searching position.
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