CN101959285A - Method for quickly searching full-band cell in WCDMA (Wideband Code Division Multiple Access) communication system - Google Patents
Method for quickly searching full-band cell in WCDMA (Wideband Code Division Multiple Access) communication system Download PDFInfo
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Abstract
The invention relates to a method for quickly searching a full-band cell in a WCDMA (Wideband Code Division Multiple Access) communication system. The method comprises the following steps of: determining band information supported by mobile equipment; generating a frequency group base frequency list covering the full band; determining a target cell in a cell selection process according to the frequency group base frequency list; and carrying out the cell selection process. By adopting the method for quickly searching the full-band cell in the WCDMA communication system, the time consumed by carrying out full-band measurement all the way is greatly shortened; meanwhile, in the process of measurement, when no measurement result is obtained in each frequency group base frequency, the frequency group base frequency measurement is carried out once again, therefore, the signal intensity change of tried frequency points can be timely detected out by the mobile equipment, and the target cell can be more accurately positioned. The method has the advantages of simple operation, quick and convenient realization process, energy saving, consumption reduction, higher success rate and wider application scope and lays a solid foundation for the further development of the modern mobile communication technology.
Description
Technical field
The present invention relates to wireless communication field, particularly mobile device cell selecting technical field in the wireless communication system specifically is meant and realizes the full range band sub-district method of search fast in a kind of WCDMA communication system.
Background technology
Wireless communication system mainly comprises GSM and two kinds of forms of CDMA at present.Operate at present in the gsm system, normally used is the solution of the double frequency-band of 900M and 1800M.And for cdma system, International Telecommunication Union has formulated a plurality of frequency ranges that cdma system can be used, though in China owing to the reason of telephone traffic has only been used frequency band 0, but along with being on the increase of number of users, in cdma system, only use a frequency range not meet consumers' demand, it is more and more nervous that local resource will inevitably become, and therefore will inevitably use a plurality of frequency bands to provide service as the user simultaneously as gsm system.
After the mobile device start, the PLMN (PLMN) that it can attempt to allow with the SIM/USIM card is got in touch, therefore mobile device will be selected a proper cell, and from this sub-district, obtain the parameter of control channel and other system configuration information, this selection course is called as the sub-district and is stationed.
Be stationed in order to carry out the sub-district when mobile device is started shooting, it will at first carry out the measurement of full range band, and purpose is to search available Target cell and be stationed.In gsm system, mobile device will at first be searched for the RF channel of 124 GSM900 frequency ranges, if support double frequency-band then search for the radio-frequency channel of 374 GSM1800 frequency ranges again, and on each RF channel, read the signal strength signal intensity of reception, calculate average level, whole measuring process will continue 3～5s, during this period of time will extract 5 from different RF channels at least respectively and measure sampling point.
Mobile device will be tuned on the carrier wave of incoming level maximum, judge at first whether this carrier wave is Broadcast Control Channel (BCCH) carrier wave (by searching the FCCH burst), if travelling carriage will be attempted decoding synchronizing channel (SCH) and come with this carrier synchronization and read system broadcast message on the Broadcast Control Channel (BCCH).If mobile device can be correctly decoded the data of Broadcast Control Channel (BCCH), and when data show this sub-district belong to selected public mobile communication net (PLMN), parameters C 1 value greater than 0, this sub-district is not under an embargo the access grade of access, travelling carriage when not forbidden by this sub-district, travelling carriage can be selected this sub-district.Otherwise, mobile device will be tuned to repeat above the trial on time high carrier wave, up to finding available sub-district.
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.
And for cdma system, the sub-district is stationed and probably is divided into following components and realizes:
(1) Cell searching
The purpose of Cell searching is to find a proper cell, and obtains its synchronous channel information, and general steps is as follows:
(a) slot synchronization
Because the synchronous code of all primary synchronization channels (SCH) all is identical in universal terrestrial access network (UTRAN), and sends in preceding 256 chips of each time slot (slot), all is identical in each time slot (slot).Mobile device uses a matched filter to obtain the synchronous of time slot.
(b) frame synchronization
Will carry out frame synchronization after the slot synchronization, frame synchronization is to use the synchronous code of auxiliary synchronization channel (SCH) to realize, the synchronous code one of auxiliary synchronization channel (SCH) has 16, in each time slot, be different, difference according to code word in each time slot forms 64 group code sequences, it is that result after their cyclic shift is unique that this 64 group code sequence has a characteristic, therefore mobile device just uses one by one and the signal that receive of this 64 group code sequence to carry out related operation, and the used secondary synchronization sequences in this sub-district of that of correlation maximum has also been determined the scrambler group and the frame synchronization of this sub-district simultaneously.
(c) main scrambler obtains
Have 8 main scramblers in the scrambler group, mobile device is gone up the scrambler that uses with each scrambler and Common Pilot Channel (CPICH) in the scrambler group and is carried out correlation computations, and the scrambler of correlation maximum is exactly the main scrambler of this sub-district.
(2) read broadcast channel
Owing in step 1, obtained the synchronizing information of this sub-district, just can obtain the information on the broadcast channel of this sub-district according to this information, general steps is as follows:
(a) Master Information Block (MIB's) obtains
The reference and the schedule information of the most of system information block in the sub-district have been provided in the Master Information Block, wherein also may comprise reference and schedule information to one or two Scheduling Block, be the reference and the schedule information of all additional system information blocks of not providing of other main information and this one or two Scheduling Block provides.Transmission and its scheduling in Master Information Block cycle on broadcast channel are static.Schedule information except other system block of information (SIB) and Scheduling Block, main information also comprises PLMN (PLMN) information, if judge that current PLMN information of obtaining and the PLMN that will be stationed the sub-district at present are inconsistent then restart the sub-district and be stationed process.
(b) system information block (SIB's) obtains
Mobile device just can obtain other system block of information according to the schedule information among the MIB after reading MIB.Be stationed for the sub-district, the system information block type 3 (SIB3) of topmost system information block comprises the sub-district in this block of information and is stationed information parameter, and is as shown in table 1.Calculate according to following formula then:
Squal＝Qqualmeas-Qqualmin
Srxlev＝Qrxlevmeas-Qrxlevmin-Pcompensation
Wherein, the implication of each parameter sees the following form 1:
| Squal | Mass value is stationed in the sub-district |
| Srxlev | The received signal level value is stationed in the sub-district |
| Qqualmeas | Mass value is stationed in the sub-district that measures under the CPICH Ec/N0 pattern |
| Qrxlevmeas | Level value is stationed in the sub-district that measures under the CPICH RSCP. pattern |
| Qqualmin | Can received signal quality minimum value |
| Qrxlevmin | Can received level minimum value |
| UE_TXPWR_MAX_RACH | Maximum transmission power on the up channel |
| P_MAX | The maximum transmission power of mobile device |
| Pcompensation | Max(UE_TXPWR_MAX_RACH-P_MAX，0) |
If Squal＞0 is Srxlev＞0 simultaneously, then mobile device thinks that this sub-district is that proper cell is resident gets off and read other needed system informations, and the sub-district is stationed successfully; Be enough to condition if be discontented with, then restart the sub-district and be stationed process.
Can imagine, because all the sub-district of the required search of frequency band is more, if adopting traditional approach searches for successively, considerable time will be spent, and in this process, possibility that also exists level to change, this also will make best cell not mobile device find, cause and judge by accident or cell selecting the sub-district gravity treatment takes place soon after successfully.Thereby use traditional approach can't avoid the defective that the mobile device starting up speed is slow, the start power consumption is big to exist.
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 more effectively carry out initial full range band Cell searching, success rate is higher, implementation procedure is efficient and convenient, energy-saving and cost-reducing, stable and reliable working performance, the scope of application realize the full range band sub-district method of search fast in the WCDMA communication system comparatively widely.
In order to realize above-mentioned purpose, realize in the WCDMA communication system of the present invention that the method for searching for fast full range band sub-district is as follows:
Realize the full range band sub-district method of search fast in this WCDMA communication system, its main feature is that described method may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and determines the band information that this mobile device itself is supported;
(2) mobile device generates the frequency group fundamental frequency tabulation that covers this band information of supporting according to the band information of being supported;
(3) mobile device is determined the Target cell of cell selecting process according to described frequency group fundamental frequency tabulation;
(4) mobile device carries out the cell selecting process.
Generation in the method that realizes in this WCDMA communication system searching for fast full range band sub-district covers the frequency group fundamental frequency tabulation of this band information of supporting, is specially:
According to the described band information of supporting, with the frequency interval of systemic presupposition whole frequency band being divided into several organizes frequently, and determine that being in this initial frequency of organizing frequently of organizing the interval location place frequently is this fundamental frequency of organizing frequently point, form described frequency group fundamental frequency tabulation by described frequency group and corresponding fundamental frequency point.
The Target cell of the definite cell selecting process in the method that realizes in this WCDMA communication system searching for fast full range band sub-district may further comprise the steps:
(11) respectively each fundamental frequency point in the described frequency group fundamental frequency tabulation is measured, obtained corresponding received signal intensity level, and each received signal intensity level is sorted;
(12) judge whether to exist the fundamental frequency point of the signal strength threshold that is higher than systemic presupposition;
(13) if there is no, then this mobile device is in the no signal coverage, does not obtain effective Target cell, and whole process finishes;
(14) if exist, the fundamental frequency point that then the selective reception signal strength values is the strongest carries out the corresponding group frequently of fundamental frequency point time-delay punishment and checks;
(15) if check and not pass through, then return above-mentioned steps (14), and selective reception signal strength values time strong fundamental frequency point carries out the time-delay of the corresponding group frequently of fundamental frequency point again and punishes inspection;
(16) if inspection is passed through, then generate the measurement tabulation of frequency measuring phases one, comprise this fundamental frequency in the measurement tabulation of this frequency measuring phases one and put the interior whole frequencies of pairing frequency group;
(17) measurement of described frequency measuring phases one tabulation is measured, obtain the received signal intensity level of each frequency in the measurement tabulation of this frequency measuring phases one, and each received signal intensity level is sorted;
(18) judge the frequency that whether exists in the measurement result of measurement tabulation of described frequency measuring phases one above the signal strength threshold of systemic presupposition;
(19) if there is no, the penalty count device that this is organized frequently is set then, this is organized the fundamental frequency punishment of delaying time frequently, and return above-mentioned step (11);
(110) if exist, the strongest frequency of selective reception signal strength values then, the measurement in the line frequency point measurement stage two of going forward side by side;
(111) judge whether the measurement result of frequency measuring phases two is effective;
(112) if measurement result is invalid, then turn back to step (18), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(113), then carry out the measurement of frequency measuring phases three if measurement result is effective;
(114) judge whether the measurement result of frequency measuring phases three is effective;
(115) if measurement result is invalid, then turn back to step (18), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(116) if measurement result is effective, then ferret out sub-district success, and return step (3).
Inspection is punished in the fundamental frequency point correspondence group time-delay frequently of carrying out in the method that realizes in this WCDMA communication system searching for fast full range band sub-district, and may further comprise the steps:
Whether (21) detect this organizes frequently and is in the punishment phase;
(22) if not, the direct result that passes through of echo check then;
(23) if penalty count device that then will this frequency group reduces 1;
(24) judge whether described penalty count device is 0;
(25) if be not 0, then this frequency group still is in the punishment phase result that echo check does not pass through;
(26) if be 0, then this frequency group has been removed punishment, and this is set organizes the punishment phase that is not in, the result that echo check passes through frequently.
The measurement of carrying out frequency measuring phases two in the method that realizes in this WCDMA communication system searching for fast full range band sub-district may further comprise the steps:
(31) select target frequency;
(32) carry out the slot synchronization process with the target frequency, and judge whether slot synchronization is successful;
(33) if slot synchronization is unsuccessful, the invalid result of the measurement result in return measurement stage two then;
(34) if the slot synchronization success then starts frame synchronizing process, and whether the judgment frame synchronizing process is successful;
(35) if frame synchronization is unsuccessful, the invalid result of the measurement result in return measurement stage two then;
(36), then start a sign indicating number synchronizing process, and judge whether the sign indicating number synchronizing process is successful if frame synchronization is successful;
(37) if yard synchronous getting nowhere, the then invalid result of the measurement result in return measurement stage two;
(38) if sign indicating number is successful synchronously, then write down received signal chip power and the chip energy and the interference power spectrum density ratio of the Common Pilot Channel of each sub-district on the current frequency, and the effective result of the measurement result in return measurement stage two.
The measurement of carrying out frequency measuring phases three in the method that realizes in this WCDMA communication system searching for fast full range band sub-district may further comprise the steps:
(41) select target sub-district;
(42) dispose the broadcast channel parameter of this Target cell, and begin to receive the system information block that this Target cell is broadcasted;
(43) if the broadcast channel parameter configuration is unsuccessful, the direct invalid result of measurement result in return measurement stage three then;
(44) if the success of broadcast channel parameter configuration, then receive and the system information blocks of data of this Target cell of successfully decoding, and according to this Target cell of Time Calculation of global terrestrial radio connecting system entrained in the local zone time of mobile device and the system information block and the time offset value between the mobile device;
(45) judge whether this time offset value is effective;
(46) if invalid, the invalid result of the measurement result in return measurement stage three then;
(47) if effectively, the effective result of the measurement result in return measurement stage three then.
Adopted and realized the full range band sub-district method of search fast in the WCDMA communication system of this invention, because wherein at first all frequencies of whole frequency band being divided into several organizes frequently, and the measurement of frequently organizing fundamental frequency carried out Primary Location earlier with the concentrated area of signal, and then the measurement result of organizing fundamental frequency according to frequency is carried out triphasic measurement to each frequency in organizing, from first to last carry out the time that full range measurement band is spent thereby reduced significantly, simultaneously in measuring process, each frequently organize measure no result in the fundamental frequency after, to carry out frequency once more and organize the fundamental frequency measurement, thereby guaranteed that mobile device can detect the change in signal strength with the frequency of being attempted timely, and then accurate in locating Target cell more, not only simple to operate, implementation procedure is efficient and convenient, energy-saving and cost-reducing, and success rate is higher, and the scope of application is comparatively extensive, for further developing of present mobile communication technology established solid foundation.
Description of drawings
Fig. 1 realizes the full range band sub-district overall flow figure of the method for search fast in the WCDMA communication system of the present invention.
Fig. 2 is the process chart that obtains Target cell in the method that realizes the quick search in full range band sub-district in the WCDMA communication system of the present invention.
Fig. 3 is the process chart that the time-delay punishment in the method that realizes in the WCDMA communication system of the present invention searching for fast full range band sub-district detects.
Fig. 4 is the measurement process chart of the frequency measuring phases two in the method that realizes in the WCDMA communication system of the present invention searching for fast full range band sub-district.
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, realize the full range band sub-district method of search fast in this WCDMA communication system, comprising following steps:
(1) mobile device carries out the opening initialization operation, and determines the band information that this mobile device itself is supported;
(2) mobile device generates the frequency group fundamental frequency tabulation that covers this band information of supporting according to the band information of being supported, is specially:
According to the described band information of supporting, with the frequency interval of systemic presupposition whole frequency band being divided into several organizes frequently, and determine that being in this initial frequency of organizing frequently of organizing the interval location place frequently is this fundamental frequency of organizing frequently point, form described frequency group fundamental frequency tabulation by described frequency group and corresponding fundamental frequency point;
(3) mobile device is determined the Target cell of cell selecting process according to described frequency group fundamental frequency tabulation; The Target cell of the definite cell selecting process in the method that realizes in this WCDMA communication system searching for fast full range band sub-district may further comprise the steps:
(a) respectively each fundamental frequency point in the described frequency group fundamental frequency tabulation is measured, obtained corresponding received signal intensity level, and each received signal intensity level is sorted;
(b) judge whether to exist the fundamental frequency point of the signal strength threshold that is higher than systemic presupposition;
(c) if there is no, then this mobile device is in the no signal coverage, does not obtain effective Target cell, and whole process finishes;
(d) if exist, the fundamental frequency point that then the selective reception signal strength values is the strongest carries out the corresponding group frequently of fundamental frequency point time-delay punishment and checks, may further comprise the steps:
Whether (i) detect this organizes frequently and is in the punishment phase;
(ii) if not, the direct result that passes through of echo check then;
(iii) if penalty count device that then will this frequency group reduces 1;
Judge (iv) whether described penalty count device is 0;
If (v) be not 0, then this frequency group still is in the punishment phase result that echo check does not pass through;
If (vi) be 0, then this frequency group has been removed punishment, and this is set organizes the punishment phase that is not in, the result that echo check passes through frequently;
(e) if check and not pass through, then return above-mentioned steps (d), and selective reception signal strength values time strong fundamental frequency point carries out the time-delay of the corresponding group frequently of fundamental frequency point again and punishes inspection;
(f) if inspection is passed through, then generate the measurement tabulation of frequency measuring phases one, comprise this fundamental frequency in the measurement tabulation of this frequency measuring phases one and put the interior whole frequencies of pairing frequency group;
(g) measurement of described frequency measuring phases one tabulation is measured, obtain the received signal intensity level of each frequency in the measurement tabulation of this frequency measuring phases one, and each received signal intensity level is sorted;
(h) judge the frequency that whether exists in the measurement result of measurement tabulation of described frequency measuring phases one above the signal strength threshold of systemic presupposition;
(i) if there is no, the penalty count device that this is organized frequently is set then, this is organized the fundamental frequency punishment of delaying time frequently, and return above-mentioned step (a);
(j) if exist, the strongest frequency of selective reception signal strength values then, the measurement in the line frequency point measurement stage two of going forward side by side may further comprise the steps:
(i) select target frequency;
(ii) carry out the slot synchronization process, and judge whether slot synchronization is successful with the target frequency;
If (iii) slot synchronization is unsuccessful, then the invalid result of the measurement result in return measurement stage two;
If (iv) slot synchronization success then starts frame synchronizing process, and whether the judgment frame synchronizing process is successful;
If (v) frame synchronization is unsuccessful, then the invalid result of the measurement result in return measurement stage two;
If (vi) frame synchronization is successful, then starts a sign indicating number synchronizing process, and judges whether the sign indicating number synchronizing process is successful;
If (vii) sign indicating number is unsuccessful synchronously, then the invalid result of the measurement result in return measurement stage two;
If (viii) sign indicating number is successful synchronously, then writes down received signal chip power and the chip energy and the interference power spectrum density ratio of the Common Pilot Channel of each sub-district on the current frequency, and the effective result of the measurement result in return measurement stage two;
(k) judge whether the measurement result of frequency measuring phases two is effective;
(l) if measurement result is invalid, then turn back to step (h), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(m) if measurement result is effective, then carry out the measurement of frequency measuring phases three, may further comprise the steps:
(i) select target sub-district;
(ii) dispose the broadcast channel parameter of this Target cell, and begin to receive the system information block that this Target cell is broadcasted;
If (iii) the broadcast channel parameter configuration is unsuccessful, the direct invalid result of measurement result in return measurement stage three then;
If (iv) broadcast channel parameter configuration success, then receive and the system information blocks of data of this Target cell of successfully decoding, and according to this Target cell of Time Calculation of global terrestrial radio connecting system entrained in the local zone time of mobile device and the system information block and the time offset value between the mobile device;
(judge v) whether this time offset value is effective;
If (vi) invalid, the invalid result of the measurement result in return measurement stage three then;
If (vii) effective, the effective result of the measurement result in return measurement stage three then;
(n) judge whether the measurement result of frequency measuring phases three is effective;
(o) if measurement result is invalid, then turn back to step (h), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(p) if measurement result is effective, then ferret out sub-district success, and return step (3);
(3) mobile device carries out the cell selecting process.
In the middle of reality was used, the method for quick full range band search cell may further comprise the steps in the WCDMA communication system of the present invention:
(1) mobile device carries out the opening initialization operation, determines the band information that current device is supported;
(2), determine the Target cell of cell selecting process according to band information;
(3) carry out the cell selecting process;
Determine the method for cell selecting Target cell in this WCDMA communication system in the method for quick full range band search cell, be specially:
Determine the cell list that Cell searching covers according to band information, again each sub-district in the tabulation taken multiple measurements, obtain Target cell again and carry out the system time skew, finally determine specifically to may further comprise the steps Target cell:
(11) determine frequently to organize fundamental frequency according to band information and measure tabulation, whole frequency band is divided into different groups according to certain frequency interval, each group is provided with a fundamental frequency, organizes the fundamental frequency tabulation frequently and will cover whole frequency band, will specifically describe in subsequent process about the division of group frequently;
(12) measure frequently organizing in the fundamental frequency tabulation each frequency, obtain its received signal intensity RSSI value, and the results list is sorted;
(13) judge whether to exist the frequency group fundamental frequency that is higher than thresholding, if there is no, then this process finishes, and returns the search failure;
(14) the strongest frequency group fundamental frequency of selection existence carries out fundamental frequency punishment and checks that this process will be in follow-up explanation;
(15) if inspection is not passed through, then turn back to (14), search time strong frequency group fundamental frequency.
(15) if inspection is passed through, then generate the measurement tabulation of frequency measuring phases one, this tabulation comprises this and organizes interior each frequency frequently;
(16) measurement of frequency measuring phases one tabulation is measured, purpose is to measure the RSSI value of each frequency in the tabulation for the acquisition stage one, and serves as that foundation is searched for the sub-district on this frequency of two need to judge whether the startup stage with this result; Acquisition stage one measurement result is also carried out descending sort;
(17) judge in stage one measurement result whether have,, then this is organized the fundamental frequency punishment of delaying time frequently, the penalty count device is set, turn back to step (12) if do not have above the thresholding frequency;
(18) there is effective frequency in stage one measurement result, then search the strongest frequency, start the measurement of frequency measuring phases two, purpose is to obtain received signal chip power RSCP and the chip energy and the value of interference power spectrum density than ECN0 of this frequency, and stages two measuring process will be in follow-up explanation.
(19) result of acquisition stage two measurements judges whether stages two measurement result is effective, if not, then turns back to step (17), continues to look in this is organized frequently time strong frequency;
(20) if stages two measurement result is effective, three measure the startup stage of then, and purpose is to obtain the system time skew of this frequency;
(21) acquisition stages three measurement result judges whether this result is effective, if not, then turns back to step (17), continues to look in this is organized frequently time strong frequency;
(22) if stages three measurement result is effective, then ferret out sub-district success is returned.
Be to prevent that certain or some strong continuous trials of organizing fundamental frequency frequently from covering the lower frequency group of signal in the method for full range band search cell fast in this WCDMA communication system to frequently organizing main purpose that fundamental frequency punishes, cause the real fundamental frequency of effectively frequently organizing to can not get all the time attempting, this testing process may further comprise the steps:
(30) detect this and organize fundamental frequency frequently and whether be in the punishment phase, if not, then directly to return to detect and pass through, this process finishes;
(31) if be in the punishment phase, then the penalty count device is subtracted one, this penalty count device is 0 to show releasing is punished;
(32) check whether the penalty count device is 0, if be not 0, illustrate that this organizes fundamental frequency frequently and still be in the punishment phase, echo check does not pass through, and this process finishes;
(33) if the penalty count device has been 0, show that then current frequency group fundamental frequency removed punishment, this is set organizes the measurement that fundamental frequency allows to participate in again frequently organizing fundamental frequency frequently, to return to detect and pass through, this process finishes.
The measuring process in the method intermediate-frequeney point stage two of quick full range band search cell in this WCDMA communication system, purpose is whether can find sub-district on the strongest frequency in order to attempt in stage one result.This process may further comprise the steps:
(41) select target frequency;
(42) carry out the slot synchronization process with the target frequency, judge whether slot synchronization is successful, if unsuccessful, then return stages two result and do not exist, and this process finishes;
(43) if success then starts frame synchronizing process, whether the judgment frame synchronizing process is successful, if unsuccessful, then return stages two result and do not exist, and this process finishes;
(44) if successful, then start a sign indicating number synchronizing process, judge whether the sign indicating number synchronizing process is successful, if unsuccessful, then return stages two result and do not exist, and this process finishes;
(45) if successfully, then write down the RSCP and the ECN0 value of the CPICH channel of each sub-district on the current frequency, then return stages two result and exist, this process finishes.
The measuring process in the method intermediate-frequeney point stage three of quick full range band search cell in this WCDMA communication system, purpose is in order to attempt whether can obtaining on the strongest sub-district time migration of mobile device and UTRAN in stages two result.This process may further comprise the steps:
(51) select target sub-district;
(52) the BCH channel parameter of configuration Target cell, the SIB (system information block) that beginning receiving target sub-district is broadcasted;
(53) if configuration BCH channel is unsuccessful, then directly return failure, this process finishes;
(54) channel configuration success, the SIB data of the reception and the Target cell of successfully decoding are according to the UTRAN system time calculating Target cell entrained among mobile device local zone time and the SIB and the time offset value of mobile device;
(54) judge whether this time offset value is effective,, then return stages three measurement result and do not exist that this process finishes if invalid;
(55) if effectively, then to return stages three measurement result and exist, this process finishes.
In the specific implementation process, see also shown in Figure 1, in this WCDMA communication system fast the method for full range band search cell comprise following step:
(1) mobile device opening initialization obtains the current band information of supporting;
(2) information that is obtained according to step S101, it is frequency group at interval that whole frequency band is divided into N, being in frequently, group frequency at interval is the fundamental frequency point.So generate and organize the fundamental frequency tabulation frequently, this tabulation will cover whole frequency band;
(3) Target cell of cell selecting is obtained in tabulation according to the frequency group fundamental frequency of step S101;
(4) carry out the cell selecting process;
See also shown in Figure 2ly again, the process of obtaining the cell selecting Target cell in this invention mainly comprises following step:
(1) execution in step S202 measures frequently organizing the fundamental frequency tabulation, obtains its RSSI value, and the main purpose of this step is by rssi measurement, scans whole frequency band fast, dwindles the scope of determining to exist Target cell;
(2) execution in step S203, the measurement result of discriminatory analysis S202, if there is no effective measurement result, then current mobile device is in no coverage, can not find effective Target cell, and this process finishes, and returns failure.
(3) if find effective measurement result in the judgement of S203, then select the strongest effective frequency, execution in step S205 carries out frequency group time-delay punishment and checks that this process will be in subsequent descriptions;
(4) if the inspection in the S206 step is not passed through, then turn back to step S204, rediscover time strong frequency group target;
(5) if S206 checks to be passed through, execution in step S207 then generates and organizes in the group of fundamental frequency frequency frequently with this and measure tabulation, and the main purpose of this step is further to determine the scope of target frequency;
(6) execution in step S208 measures the tabulation that S207 generated, and obtains the RSSI value of each frequency;
(7) result to step S208 analyzes in the S209 step, at first attempts the frequency of the strongest RSSI value;
(8) if can't find effective frequency in this analyzes, then execution in step S215 is provided with the penalty count device that this is organized frequently, this is organized frequently punish, to reduce this frequency group with strong RSSI value to other interference of organizing frequently; Turn back to step S202, again whole fundamental frequency tabulation is measured and analyzed;
(9) if find effective frequency in step S209, then execution in step S210 carries out stages two measurement to this target frequency, and purpose is RSCP value, ECN0 value and the dominant interference code word that measures this frequency, and this process is described in follow-up;
(10) whether the measurement result among the judgement S210 exists, and if not, then returns step S209, looks for time strong interior frequency of group;
(11) if there is effective result in stage two, then execution in step S212 carries out stages three measurement, and purpose is the system time deviant that measures between mobile device and the UTRAN, and this process also will be illustrated in subsequent process;
(12) in step 213, the measurement result in stage three is analyzed, if there is no effective result then turns back to step S209, looks for time strong interior frequency of group;
(13) if stages three measurement result is effective, then this process finishes, and returns success.
See also shown in Figure 3ly again, frequency group of the present invention time-delay punishment checking process comprises following step:
(1) at first execution in step S300 obtains the strongest effective frequency;
(2) execution in step S301 checks that this organizes fundamental frequency frequently and whether be in by the punishment phase, if not, execution in step S305 then, directly echo check passes through, and shows that this organizes fundamental frequency frequently is effective frequency;
(3) if be in the punishment phase, then execution in step S302 subtracts one with the penalty count device, and this penalty count device is 0 to show releasing is punished;
(4) execution in step S303 checks whether the penalty count device is 0, if be not 0, execution in step S306 illustrates that this organizes fundamental frequency frequently and still be in the punishment phase, and echo check does not pass through, and this process finishes;
(5) if the penalty count device is 0, then show contact punishment, execution in step S304 reverts to effective fundamental frequency with this fundamental frequency;
(6) execution in step S305 by detecting, returns success;
See also shown in Figure 4ly again, stages two measuring process of the present invention mainly comprises following step:
(1) execution in step S400, the select target frequency;
(2) execution in step S401 carries out the slot synchronization process with the target frequency;
(3) the slot synchronization process finishes, and execution in step S402 judges whether slot synchronization is successful, if unsuccessful, then return stages two result and do not exist, execution in step S407, and this process finishes;
(4) if successful, then execution in step S403 starts frame synchronizing process;
(5) frame synchronizing process finishes, execution in step S404, and whether the judgment frame synchronizing process is successful, if unsuccessful, then return stages two result and do not exist, execution in step S407, this process finishes;
(6) if successful, then execution in step S405 starts a sign indicating number synchronizing process;
(7) the sign indicating number synchronizing process finishes, and execution in step S406 judges whether the sign indicating number synchronizing process is successful, if unsuccessful, then return stages two result and do not exist, execution in step S407, and this process finishes;
(8) if success, execution in step S408 then writes down the RSCP and the ECN0 value of the CPICH channel of each sub-district on the current frequency, then returns stages two result and exists, the end of this process.
Stages three measuring process of the present invention mainly comprises following step;
(1) execution in step S500, the select target sub-district;
(2) find Target cell after, execution in step S501, configuration BCH channel, the SIB (system information block) that beginning receiving target sub-district is broadcasted;
(3) execution in step S502 judges whether the BCH channel configuration is successful, if unsuccessful, then execution in step S506 directly returns failure, and this process finishes;
(4) if BCH channel configuration success, execution in step S503 then receives and the SIB data of the Target cell of successfully decoding, according to the UTRAN system time calculating Target cell entrained among mobile device local zone time and the SIB and the time offset value of mobile device;
(5) execution in step S504 judges whether this time migration of obtaining is effective, if invalid, then execution in step S506 directly returns failure, and this process finishes;
(6) if time migration is effective, then execution in step S505 returns stages three measurement result and exists, and this process finishes.
Realize the full range band sub-district method of search fast in the WCDMA communication system of the present invention, its basic thought is that all frequencies with whole frequency band are divided into several and organize frequently, each is organized frequently with a fundamental frequency and represents, the measurement of frequently organizing fundamental frequency is at first arrived the concentrated area of signal by Primary Location, according to the result who frequently organizes fundamental frequency each frequency in organizing is carried out triphasic measurement again, in this process, when having as a result, any one stage return measurement all will not stop immediately, and then attempt next target, reduced greatly and measured the time that the full range band is spent; And, in measuring process, each frequently organize measure no effective result in the fundamental frequency after, selecting next to organize frequently again will carry out frequency before the fundamental frequency once more and organize fundamental frequency and measure, guarantee that mobile device can detect the frequency of having been attempted and change, this frequency signal that will guarantee in time to monitor in the measuring process changes, prevent to exist in the long measuring process, the situation that certain frequency level draws high gradually, also can cover the scene that the sub-district allows the access situation to change, so just accurate in locating Target cell more.
Adopted and realized the full range band sub-district method of search fast in the above-mentioned WCDMA communication system, because wherein at first all frequencies of whole frequency band being divided into several organizes frequently, and the measurement of frequently organizing fundamental frequency carried out Primary Location earlier with the concentrated area of signal, and then the measurement result of organizing fundamental frequency according to frequency is carried out triphasic measurement to each frequency in organizing, from first to last carry out the time that full range measurement band is spent thereby reduced significantly, simultaneously in measuring process, each frequently organize measure no result in the fundamental frequency after, to carry out frequency once more and organize the fundamental frequency measurement, thereby guaranteed that mobile device can detect the change in signal strength with the frequency of being attempted timely, and then accurate in locating Target cell more, not only simple to operate, implementation procedure is efficient and convenient, energy-saving and cost-reducing, and success rate is higher, and the scope of application is comparatively extensive, for further developing of present mobile communication technology established solid foundation.
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 (6)
1. realize the full range band sub-district method of search fast in a WCDMA communication system, it is characterized in that described method may further comprise the steps:
(1) mobile device carries out the opening initialization operation, and determines the band information that this mobile device itself is supported;
(2) mobile device generates the frequency group fundamental frequency tabulation that covers this band information of supporting according to the band information of being supported;
(3) mobile device is determined the Target cell of cell selecting process according to described frequency group fundamental frequency tabulation;
(4) mobile device carries out the cell selecting process.
2. realize the full range band sub-district method of search fast in the WCDMA communication system according to claim 1, it is characterized in that described generation covers the frequency group fundamental frequency tabulation of this band information of supporting, is specially:
According to the described band information of supporting, with the frequency interval of systemic presupposition whole frequency band being divided into several organizes frequently, and determine that being in this initial frequency of organizing frequently of organizing the interval location place frequently is this fundamental frequency of organizing frequently point, form described frequency group fundamental frequency tabulation by described frequency group and corresponding fundamental frequency point.
3. realize the full range band sub-district method of search fast in the WCDMA communication system according to claim 2, it is characterized in that the Target cell of described definite cell selecting process may further comprise the steps:
(11) respectively each fundamental frequency point in the described frequency group fundamental frequency tabulation is measured, obtained corresponding received signal intensity level, and each received signal intensity level is sorted;
(12) judge whether to exist the fundamental frequency point of the signal strength threshold that is higher than systemic presupposition;
(13) if there is no, then this mobile device is in the no signal coverage, does not obtain effective Target cell, and whole process finishes;
(14) if exist, the fundamental frequency point that then the selective reception signal strength values is the strongest carries out the corresponding group frequently of fundamental frequency point time-delay punishment and checks;
(15) if check and not pass through, then return above-mentioned steps (14), and selective reception signal strength values time strong fundamental frequency point carries out the time-delay of the corresponding group frequently of fundamental frequency point again and punishes inspection;
(16) if inspection is passed through, then generate the measurement tabulation of frequency measuring phases one, comprise this fundamental frequency in the measurement tabulation of this frequency measuring phases one and put the interior whole frequencies of pairing frequency group;
(17) measurement of described frequency measuring phases one tabulation is measured, obtain the received signal intensity level of each frequency in the measurement tabulation of this frequency measuring phases one, and each received signal intensity level is sorted;
(18) judge the frequency that whether exists in the measurement result of measurement tabulation of described frequency measuring phases one above the signal strength threshold of systemic presupposition;
(19) if there is no, the penalty count device that this is organized frequently is set then, this is organized the fundamental frequency punishment of delaying time frequently, and return above-mentioned step (11);
(110) if exist, the strongest frequency of selective reception signal strength values then, the measurement in the line frequency point measurement stage two of going forward side by side;
(111) judge whether the measurement result of frequency measuring phases two is effective;
(112) if measurement result is invalid, then turn back to step (18), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(113), then carry out the measurement of frequency measuring phases three if measurement result is effective;
(114) judge whether the measurement result of frequency measuring phases three is effective;
(115) if measurement result is invalid, then turn back to step (18), continue in this is organized frequently, to seek received signal intensity time strong frequency;
(116) if measurement result is effective, then ferret out sub-district success, and return step (3).
4. the method for the realization full range quick search in band sub-district is characterized in that in the WCDMA communication system according to claim 3, and the described corresponding frequency of fundamental frequency point that carries out is organized the punishment inspection of delaying time, and may further comprise the steps:
Whether (21) detect this organizes frequently and is in the punishment phase;
(22) if not, the direct result that passes through of echo check then;
(23) if penalty count device that then will this frequency group reduces 1;
(24) judge whether described penalty count device is 0;
(25) if be not 0, then this frequency group still is in the punishment phase result that echo check does not pass through;
(26) if be 0, then this frequency group has been removed punishment, and this is set organizes the punishment phase that is not in, the result that echo check passes through frequently.
5. realize the full range band sub-district method of search fast in the WCDMA communication system according to claim 3, it is characterized in that the described measurement of carrying out frequency measuring phases two may further comprise the steps:
(31) select target frequency;
(32) carry out the slot synchronization process with the target frequency, and judge whether slot synchronization is successful;
(33) if slot synchronization is unsuccessful, the invalid result of the measurement result in return measurement stage two then;
(34) if the slot synchronization success then starts frame synchronizing process, and whether the judgment frame synchronizing process is successful;
(35) if frame synchronization is unsuccessful, the invalid result of the measurement result in return measurement stage two then;
(36), then start a sign indicating number synchronizing process, and judge whether the sign indicating number synchronizing process is successful if frame synchronization is successful;
(37) if yard synchronous getting nowhere, the then invalid result of the measurement result in return measurement stage two;
(38) if sign indicating number is successful synchronously, then write down received signal chip power and the chip energy and the interference power spectrum density ratio of the Common Pilot Channel of each sub-district on the current frequency, and the effective result of the measurement result in return measurement stage two.
6. realize the full range band sub-district method of search fast in the WCDMA communication system according to claim 3, it is characterized in that the described measurement of carrying out frequency measuring phases three may further comprise the steps:
(41) select target sub-district;
(42) dispose the broadcast channel parameter of this Target cell, and begin to receive the system information block that this Target cell is broadcasted;
(43) if the broadcast channel parameter configuration is unsuccessful, the direct invalid result of measurement result in return measurement stage three then;
(44) if the success of broadcast channel parameter configuration, then receive and the system information blocks of data of this Target cell of successfully decoding, and according to this Target cell of Time Calculation of global terrestrial radio connecting system entrained in the local zone time of mobile device and the system information block and the time offset value between the mobile device;
(45) judge whether this time offset value is effective;
(46) if invalid, the invalid result of the measurement result in return measurement stage three then;
(47) if effectively, the effective result of the measurement result in return measurement stage three then.
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