CN100341378C - Method for searching upline special physical channel - Google Patents
Method for searching upline special physical channel Download PDFInfo
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- CN100341378C CN100341378C CNB2004100582530A CN200410058253A CN100341378C CN 100341378 C CN100341378 C CN 100341378C CN B2004100582530 A CNB2004100582530 A CN B2004100582530A CN 200410058253 A CN200410058253 A CN 200410058253A CN 100341378 C CN100341378 C CN 100341378C
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Abstract
The present invention discloses a method for searching an uplink special physical channel, which comprises: initial searching window width and stabilized searching window width are arranged for a searching window for searching the upline special physical channel DPCH of a base station the initial searching window width is bigger than the stabilized searching window width, and the base station adopts the initial searching window width to search the DPCH at the time of initial searching; when the searching is stable, the stabilized searching window width is adopted to search the DPCH, and the searching window width at least covers the phase of a path which is searched. Therefore, the present invention realizes the dynamic collocation of the searching window width, and accordingly, the present invention both ensures the correction rate of the initial searching, and saves system resource.
Description
Technical field
The present invention relates to the Radio Transmission Technology of Wideband Code Division Multiple Access (WCDMA) (WCDMA), be meant a kind of searching method of uplink special physical channel especially.
Background technology
In the WCDMA system, when subscriber equipment (UE) when the base station initiate to be inserted, UE at first can send prefix (Preamble) to the base station, the base station can obtain the initial phase of uplink special physical channel (DPCH) by this prefix of search.Yet because the existence of multidiameter delay expansion, uplink special physical channel must be searched in the base station in rational sequential scope multipath phase place, finishing the correct demodulation to DPCH, thereby realize the foundation of UE to base station radio link, this sequential scope is search window.Here multidiameter delay expansion is meant, under multipath propagation environment, because the difference of propagation path causes multipath signal to arrive receiving terminal with the different time.If just single pulse signal that transmitting terminal sends, what receiving terminal was received so will be a plurality of stacks with pulse of different delay, and from time-domain, so-called time delay expansion has appearred in received signal.
Yet owing to the certainty of measurement of base station self, there is error unavoidably in its measurement for prefix on the one hand, makes the initial phase of base station search acquisition and the phase place of the actual DPCH of the carrying out emission of UE have deviation; On the other hand, begin the emission of up DPCH to UE owing to obtain the initial phase of DPCH from the base station, the time of a midfeather level second, during this period of time, UE can be moved unavoidably, thereby also causes having certain deviation between the initial phase of phase place that its UE finally carries out DPCH emission and base station acquisition.Therefore, when the base station is searched for DPCH,, will inevitably increase the search failed probability greatly if determine the hunting zone according to its initial phase that in access procedure, obtains.Therefore the base station should be done one to the start-phase of the search window of DPCH with respect to the initial phase that obtains and prolongs expansion before bigger in access procedure, to overcome above-mentioned deviation.Therefore, according to the 3GPP agreement, when initial ranging, in order to overcome the error that access procedure produces, it is bigger that the width of search window should dispose, and reach about 100chips, and when search was stablized, the width of search window was much smaller.Yet this just faces the problem how to accept or reject between two search window widths.
The search window width that a solution of prior art needs when to be the base station to the search of DPCH adopt static initial ranging from start to finish, another kind of solution are base station needed search window widths when adopting static last line search to stablize from start to finish to the search of DPCH.Yet for first kind of scheme, when last line search was stablized, so big search window width when usually not needing to use initial ranging as at urban area circumstance, must cause the huge waste of hardware resource.And for second kind of scheme, as previously mentioned, because when last line search was stablized, the search window width that base station search DPCH needs was smaller, and when initial ranging, need a big search window width again, to overcome put-into error.Therefore, if adopt a smaller search window, must make the increase of initial ranging DPCH error probability finally to cause Radio Link to set up failure.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of searching method of uplink special physical channel, in the accuracy that guarantees initial ranging, realizes the reasonable resources utilization.
In order to achieve the above object, the searching method of a kind of uplink special physical channel of the present invention, by initial ranging window width and stable search window width are set for the search window of base station search uplink special physical channel DPCH, and make the initial ranging window width greater than stable search window width, this method also comprises the steps:
The multipath phase place of initial ranging window width search DPCH is adopted in a, base station;
B, judge whether search enters stable state, if, execution in step c then, otherwise execution in step a;
The multipath phase place of stable search window width search DPCH is adopted in c, base station, and is somebody's turn to do the phase place that stable search window width covers a footpath that searches at least.
In said method, judge among the described step b whether search enters stable state and be: judge whether DPCH enters synchronous regime.
In said method, judge among the described step b whether search enters stable state and be: whether the time of judging the multipath phase place of base station search DPCH surpasses the time limit of setting.
In said method, before step c, further comprise:
C1, judge the DPCH search the multidiameter delay spreading range whether greater than the stable search window width of setting, if, the multidiameter delay spreading range of dwindling the DPCH that searches, execution in step c then, otherwise direct execution in step c;
The step that stable search window width covers the phase place in a footpath that searches at least among the described step c is: utilize stable search window width to cover the current multidiameter delay spreading range of DPCH.
In said method, the step of dwindling the multidiameter delay spreading range of the DPCH that searches among the described step c1 comprises: comparison search to the multidiameter delay spreading range of DPCH in first footpath and tail footpath energy directly, delete the little footpath of energy then.
In said method, utilize stable search window width to cover the current multidiameter delay spreading range step of DPCH among the described step c and comprise: the mid point that the mid point of search window is placed the multidiameter delay spreading range.
In sum, the present invention is when base station search DPCH, dispose two search window widths: initial ranging window width and stable search window width, when initial ranging, adopt the initial ranging window width to search for, and when search is stablized, then adopt stable search window width to search for, realize the dynamic-configuration of search window width, thereby both guaranteed the accuracy of initial ranging, saved resource again.
Description of drawings
Fig. 1 is an overall method flow diagram of the present invention.
Fig. 2 is the method flow diagram of the specific embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Main thought of the present invention is: for the search window width of base station search DPCH is provided with two parameters: initial ranging window width and stable search window width, wherein making the initial ranging window width is a bigger value, stable search window width is a less value, and the initial ranging window width is greater than stable search window width.When initial ranging, initial ranging window width search DPCH is adopted in the base station, when search is stablized, adopts stable search window width to search for.Group method flow chart of the present invention specifically comprises the steps: as shown in Figure 1
In step 101, the multipath phase place of initial ranging window width search DPCH is adopted in the base station.
In step 102, judge whether search enters stable state, if then execution in step 103, otherwise execution in step 101.
In step 103, adopt the multipath phase place of stable search window width search DPCH, and make this search window width cover the phase place in a footpath that searches at least.
Further specify the present invention below by a specific embodiment, the method flow diagram of present embodiment specifically comprises the steps: as shown in Figure 2
In step 201, the multipath phase place of initial ranging window width search DPCH is adopted in the base station.Wherein the initial ranging window width is a bigger value, and as the phase place of initial search window be: 0～100chips, obviously this initial ranging window width is 100chips.
In step 202, judge whether search enters stable state, if search enters stable state, then execution in step 203, otherwise execution in step 201.Whether above-mentioned judgement search enters the method for stable state can be by judging whether DPCH enters synchronous regime and realize, if judge that promptly DPCH enters synchronous regime, then can draw search and enter stable state, otherwise show that search is also for entering synchronous regime; Whether the time of multipath phase place that also can be by judging base station search DPCH has surpassed the time limit of setting, and as 2s, realizes.
In step 203, whether the multidiameter delay spreading range of judging the DPCH search greater than the stable search window width of setting, if then execution in step 204, otherwise execution in step 205.Wherein, stable search window width is a less value, and stable search window width is less than the initial ranging window width, as 50chips.
For example, the base station utilizes the initial ranging window width to search 5 footpaths when initial ranging, and the phase place in each footpath is respectively 20,30,50,60,90, and corresponding footpath energy is respectively 200,150,120,190,140.The multidiameter delay spreading range that can calculate the DPCH that searches thus is: 20～90 (90-20+1=71＞50), the multidiameter delay spreading range of the DPCH that as seen searches is greater than the stable search window width of setting.
In step 204, dwindle the multidiameter delay spreading range of the DPCH that searches, return step 203 then.Wherein, the step of dwindling the multidiameter delay spreading range of the DPCH that searches can be: compare first footpath and tail footpath energy directly in the multidiameter delay spreading range, then that energy is little footpath deletion.
By the example in the above-mentioned steps 203, compare first footpath and tail footpath energy directly in the multidiameter delay spreading range, tail directly is the little footpath of energy as can be known, therefore tail is directly deleted from the time delay spreading range, at this moment, the time delay spreading range is: 20～60 (60-20+1=41＜50).Return step 203 then, continue relatively the time delay spreading range and stable search window width in residue footpath, the time delay spreading range that must remain the footpath is less than the stable search window width of setting, so execution in step 205.
In step 205, adopt the multipath phase place of stable search window width search DPCH, and make this search window width cover current multidiameter delay spreading range.Specifically the mid point of search window can be placed the mid point of multidiameter delay spreading range, the width configuration with search window is the stable search window width of setting then.
Illustrated that by above-mentioned example the mid point with search window places 40chips exactly, then the phase place of this search window is: 15～64chips can cover residue time delay spreading range directly fully.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit the present invention, and is within the spirit and principles in the present invention all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1, a kind of searching method of uplink special physical channel, it is characterized in that, for the search window of base station search uplink special physical channel DPCH is provided with initial ranging window width and stable search window width, and make the initial ranging window width greater than stable search window width, this method also comprises the steps:
The multipath phase place of initial ranging window width search DPCH is adopted in a, base station;
B, judge whether search enters stable state, if, execution in step c then, otherwise execution in step a;
The multipath phase place of stable search window width search DPCH is adopted in c, base station, and is somebody's turn to do the phase place that stable search window width covers a footpath that searches at least.
2, method according to claim 1 is characterized in that judging among the described step b whether search enters stable state and be: judge whether DPCH enters synchronous regime.
3, method according to claim 1, it is characterized in that judging among the described step b whether search enters stable state and be: whether the time of judging the multipath phase place of base station search DPCH surpasses the time limit of setting.
4, method according to claim 1 is characterized in that, before step c, further comprises:
C1, judge the DPCH search the multidiameter delay spreading range whether greater than the stable search window width of setting, if, the multidiameter delay spreading range of dwindling the DPCH that searches, execution in step c then, otherwise direct execution in step c;
The step that stable search window width covers the phase place in a footpath that searches at least among the described step c is: utilize stable search window width to cover the current multidiameter delay spreading range of DPCH.
5, method according to claim 4, the step that it is characterized in that dwindling among the described step c1 multidiameter delay spreading range of the DPCH that searches comprises: comparison search to the multidiameter delay spreading range of DPCH in first footpath and tail footpath energy directly, delete the little footpath of energy then.
6, method according to claim 4 is characterized in that utilizing among the described step c stable search window width to cover the current multidiameter delay spreading range step of DPCH and comprises: the mid point that the mid point of search window is placed the multidiameter delay spreading range.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100582530A CN100341378C (en) | 2004-08-20 | 2004-08-20 | Method for searching upline special physical channel |
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| CNB2004100582530A CN100341378C (en) | 2004-08-20 | 2004-08-20 | Method for searching upline special physical channel |
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| CN1738471A CN1738471A (en) | 2006-02-22 |
| CN100341378C true CN100341378C (en) | 2007-10-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101047460B (en) * | 2006-03-30 | 2012-02-29 | 华为技术有限公司 | Counting method and device for transmission delay of physical random access channel |
| CN103368604B (en) * | 2012-04-09 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of multipath searching method of self-adaptative adjustment search window and device |
| CN114451034A (en) * | 2019-09-30 | 2022-05-06 | 华为技术有限公司 | Information processing method and communication equipment |
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| US6226282B1 (en) * | 1997-12-27 | 2001-05-01 | Hyundai Electronics Ind. Co., Ltd. | Method of searching reverse traffic channels in a CDMA mobile radio communication system |
| CN1347223A (en) * | 2001-10-22 | 2002-05-01 | 信息产业部电信传输研究所 | Multipath signal processing method with slow path search and multi-window fast channel estimation |
| CN1383623A (en) * | 2000-06-24 | 2002-12-04 | 三星电子株式会社 | Appts. and method for synchronization of uplink synchronous transmission scheme in CDMa communication system |
| US20030069044A1 (en) * | 2001-10-09 | 2003-04-10 | Hitachi Kokusai Electric Inc. | CDMA wireless base station |
| JP2004064419A (en) * | 2002-07-29 | 2004-02-26 | Nec Corp | Cdma basic station receiver and its radio synchronization deciding method |
| CN1505294A (en) * | 2002-12-05 | 2004-06-16 | 华为技术有限公司 | A multi-user receiving device of uplink dedicated physical channel in WCDMA system |
| CN1507189A (en) * | 2002-12-12 | 2004-06-23 | 华为技术有限公司 | Searcher and its multipath search method |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6226282B1 (en) * | 1997-12-27 | 2001-05-01 | Hyundai Electronics Ind. Co., Ltd. | Method of searching reverse traffic channels in a CDMA mobile radio communication system |
| CN1383623A (en) * | 2000-06-24 | 2002-12-04 | 三星电子株式会社 | Appts. and method for synchronization of uplink synchronous transmission scheme in CDMa communication system |
| US20030069044A1 (en) * | 2001-10-09 | 2003-04-10 | Hitachi Kokusai Electric Inc. | CDMA wireless base station |
| CN1347223A (en) * | 2001-10-22 | 2002-05-01 | 信息产业部电信传输研究所 | Multipath signal processing method with slow path search and multi-window fast channel estimation |
| JP2004064419A (en) * | 2002-07-29 | 2004-02-26 | Nec Corp | Cdma basic station receiver and its radio synchronization deciding method |
| CN1505294A (en) * | 2002-12-05 | 2004-06-16 | 华为技术有限公司 | A multi-user receiving device of uplink dedicated physical channel in WCDMA system |
| CN1507189A (en) * | 2002-12-12 | 2004-06-23 | 华为技术有限公司 | Searcher and its multipath search method |
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