CN1725664A - Radial search method - Google Patents
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- CN1725664A CN1725664A CNA2004100546197A CN200410054619A CN1725664A CN 1725664 A CN1725664 A CN 1725664A CN A2004100546197 A CNA2004100546197 A CN A2004100546197A CN 200410054619 A CN200410054619 A CN 200410054619A CN 1725664 A CN1725664 A CN 1725664A
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Abstract
A method of radial search includes starting up the first search engine to carry out radial search in search window range of said engine , starting up the second engine if effective radial information is non searched out or searched - out effective information does not reach quantity as required , carrying out continuous radial search at adjacent region of the first search engine by using the first search engine search window range as the centre until effective radial information is searched out by the second search engine .
Description
Technical field
The present invention relates to the path search technology in the WCDMA upstream special link-circuit Base-Band Processing, particularly a kind of path search method.
Background technology
WCDMA upstream special link-circuit Base-Band Processing comprises that descrambling, despreading, path search, signal-to-jamming ratio (SIR) are estimated, separated and is in harmonious proportion decoding etc.Wherein, the result of path search is used for instructing SIR to estimate, separate to be in harmonious proportion and decipher.In the Base-Band Processing algorithm, the path search method is the most flexibly, and there is different implementations in different equipment vendors, and the quality of path search method has very big influence to base band demodulating performance and system robustness.
The WCDMA upstream special link-circuit adopts the quick inner-loop power control technology of 1500Hz.The principle of this technology is that the SIR on special-purpose physical control channel (DPCCH) territory in every time slot upstream special link-circuit is estimated in the base station, and with the target-to-jammer ratio (SIR Target) of signal relatively, produce suitable power control commands word, instruct terminal to carry out the power adjustment with the power control command word, resist the rapid fading in the wireless environment, eliminate the near-far interference of terminal simultaneously.The purpose of this technology is that travelling carriage can send suitable power according to channel circumstance and noise situations, and the travelling carriage that makes the base station receive is transmitted into signal of base station power and equates, satisfies the requirement of institute's bearer service service quality (Qos).
Wherein, " 1 " is the power per liter order, and for falling power command, the generation of power control commands word can be expressed as follows " 1 ":
The physical meaning of signal-to-jamming ratio SIR is the energy of each symbol on the upstream special link-circuit DPCCH territory and the ratio of noise, and noise herein comprises two parts: a part is the heat of the base station P that makes an uproar
N, normally one with realize relevant constant value; Another part is the received signal energy sum of other terminal.It is as follows to embody formula:
As seen, WCDMA is a typical self-interference system.Each terminal all is a noise source of other terminal, and the transmitting power of a terminal increases, and can impel the transmitting power of other terminal to increase thereupon, converges on a new balance point until whole system.The WCDMA system just is among a kind of like this dynamic equilibrium, and several key factors of keeping balance are: the power control commands word that the power control commands word that power system capacity is not transshipped, the base station produces is correct, terminal correctly receives the base station is also carried out the corresponding action of adjusting power.Any one link of these factors occurs unusual, all will cause the poised state of system destroyed.Under extreme case,, may cause other terminal of whole sub-district all can't insert if the terminal near the base station reception antenna is launched with full power.
Therefore, if the poised state of system is destroyed, will have influence on the stability of whole system so.For keeping the poised state of WCDMA system, strict requirement has been proposed for the robustness design of WCDMA upstream special link-circuit.On the Base-Band Processing algorithm of base station, Xiang Guan the more important is that base station receiver can correctly trace into effective footpath information all the time therewith, and uses these footpaths information guiding SIR to estimate and Dedicated Physical Data Channel (DPDCH) demodulation.
Industry mainly contains two kinds of methods on path search at present, and a kind of method is to every upstream special link-circuit, and the Base-Band Processing part uses the scrambler of this link and the pilot field information of DPCCH to carry out path search at regular intervals; Another kind method is every the relatively long time, uses the pilot field information of scrambler and DPCCH to carry out path search, and on the basis of this path search, the footpath that search is come out is followed the tracks of.
No matter adopt above-mentioned which kind of method, owing to being limited in scope of path search window, in case the footpath is positioned at outside the scope of path search window, path search just can't search effective footpath information.If effectively footpath information does not instruct, the SIR results estimated will be very low, and is general complete under SIR Target thresholding, and inner-loop power control will produce height-rise power control commands word fast, make the power flash-up of terminal, and then influence the robustness of upstream special link-circuit.Simultaneously,, just wasted portion of energy separating timing, thereby caused demodulation performance to descend if effective diameter information gathering is incomplete.
Less than upstream special link-circuit effectively during the information of footpath, a solution of generally adopting of industry is that the uplink power control command word is adopted special sequence at present in search, allows slow the increasing of power of terminal, rather than increases sharply.For example, when not adopting special nothing footpath power control pattern, every 10ms will produce the command word of 15 power per liter; And after adopting special nothing footpath power control pattern, every 10ms will produce command word and 7 command words of falling power of 8 power per liter, after lifting power command word is offset, and the command word of only unnecessary 1 power per liter of every 10ms.
But, above-mentioned have two shortcomings to search less than the effective directly solution of information of upstream special link-circuit: first shortcoming is when soft handover, because the up link search is less than effective footpath information, when up link adopts special nothing footpath power control pattern can make terminal merge the power control commands word, the probability that the power power control commands falls in generation increases, thereby causes handover success rate to reduce; Though second slow increasing of power that shortcoming is a terminal, if it is longer not have the time of link maintenance directly, the power ramp that also will make terminal is to very high degree, and still there is threat in the robustness to system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of path search method, and the effective diameter search as much as possible that drops on outside the first searcher search window scope is come out.
For achieving the above object, the invention provides a kind of path search method, key is that this method may further comprise the steps at least:
A, startup first searcher carry out path search in the search window scope of first searcher;
If B does not search effective footpath information, the quantity that perhaps searches effective diameter information does not reach desired value, then starts second searcher;
C, the scope that covers with the first searcher search window are the center, continuous path search are carried out in the adjacent area of first searcher, till second searcher can search effective footpath information.
This method further comprises: D, use second searcher to search effective footpath information after, the search window scope of first searcher is covered the footpath that searches, and discharges second searcher.
In the such scheme, the quantity of described second searcher and search window scope are determined according to the actual conditions of searcher resource and system resource.
If described second searcher be one with the identical searcher of the first searcher search window scope, described step B further comprises: on different time periods and different searching position, utilize the adjacent area of this searcher, carry out the identical path search in each hunting zone in the first searcher search window scope.
If described second searcher is two searchers that the search window scope is identical, described step B further comprises: on different time periods and different searching position, utilize these two searchers respectively in the left and right sides of the first searcher search window scope adjacent area, carry out the identical path search in each hunting zone.
Therefore, this path search method provided by the invention, do not search effective diameter information at upstream special link-circuit, the quantity that perhaps searches effective diameter information does not reach under the situation of desired value, by using second searcher, the temporary transient scope that enlarges path search is come out the effective diameter search as much as possible that drops on outside the first searcher search window scope.The effective diameter information guiding SIR that use searches estimates, can improve the correctness that SIR estimates, and then improves the robustness of upstream special link-circuit; Whole effective diameter information guiding upstream special link-circuit DPDCH that use searches carry out demodulation, can improve the demodulation performance of upstream special link-circuit DPDCH.
Description of drawings
Fig. 1 is the schematic diagram of path search in a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples, and with reference to accompanying drawing, the present invention is described in more detail.
The present invention does not search effective diameter information at upstream special link-circuit, the quantity that perhaps searches effective diameter information does not reach under the situation of desired value, by using second searcher, the temporary transient scope that enlarges path search is come out the effective diameter search as much as possible that drops on outside the first searcher search window scope.
Described in the present invention first searcher is the original searcher that uses of path search, and second searcher is for realizing the searcher in system's public resource that purpose of the present invention uses.Second searcher can have one, also can have a plurality of.
This preferred embodiment that the present invention lifted, be not search under the situation of effective diameter information at upstream special link-circuit, by use one with the second identical searcher of the first searcher search window scope, the temporary transient scope that enlarges path search is come out the effective diameter search as much as possible that drops on outside the first searcher search window scope.
As shown in Figure 1, Fig. 1 is the schematic diagram of path search in a preferred embodiment of the present invention, and its process may further comprise the steps:
Step 101: start first searcher, in the search window scope of first searcher, carry out path search, judge whether to search effective footpath information.
The search window scope of supposing first searcher is τ, and shown in Fig. 1 (a), Fig. 1 (a) is the schematic diagram when not searching effective diameter information.On time shaft t, BFN (Node B Frame Number) expression base station frame number, its span is (0,4095), f0 is the numbering of effective diameter.This moment, effective diameter f0 was positioned at outside the first searcher search window scope τ, and first searcher can not search effectively footpath information of upstream special link-circuit.
Step 102: if do not search effective footpath information, then start second searcher, the scope that covers with the first searcher search window is the center, continuous path search is carried out in the adjacent area of first searcher, till searching effective footpath information.
Shown in Fig. 1 (b), Fig. 1 (b) carries out the schematic diagram of extensive search for using second searcher.Second searcher that uses in the present embodiment just can search the effective diameter information that satisfies actual needs in the hunting zone of 3 τ.In fact the scope of utilizing second searcher to search among the present invention can be adjusted according to actual needs, and the original position that only need reconfigure search window during adjustment gets final product.Because for a searcher, though its search capability is fixed, the original position of search window is configurable, just can enlarge the scope of search by the original position of configuration search window.
When the original position of configuration search window, generally be that the scope that covers with the first searcher search window is the center, change the original position of the second searcher search window in the adjacent area of first searcher, continuous path search is carried out in adjacent area to first searcher, till searching the effective diameter information that satisfies actual needs.
This of Shi Yonging second searcher in the present embodiment, the scope of its search window is τ, is to carry out path search in time-multiplexed mode in the scope of 3 τ.So-called time-multiplexed mode is exactly on different time periods and different searching position, utilizes same searcher to carry out the identical path search in each hunting zone.So just needn't design the bigger searcher of other search capabilities, thereby utilize less searching resource just can enlarge the scope of search for enlarging the search window scope.
Step 103: search after the information of effective footpath, adjust the searching position of first searcher, make the search window scope of first searcher can cover the footpath that searches, and discharge second searcher, make the processing of this dedicated link recover normal.
After the adjustment of finishing the first searcher search window scope, why needing to discharge second searcher, is because in the ordinary course of things, can handle a plurality of dedicated links in the processor, after second searcher is released, can use it for the processing of other dedicated link.
This preferred embodiment that the present invention lifted, utilizing first searcher not search under the situation of upstream special link-circuit effective diameter information, by using second searcher of a search window scope as τ, in the hunting zone of 3 τ, carry out path search, searched effective footpath information in time-multiplexed mode.
In actual applications, can not reach under the situation of desired value in the quantity that upstream special link-circuit DPDCH searches effective diameter information, each channel in the upstream special link-circuit uses second searcher in turn, enlarges the hunting zone, to collect all effectively footpath information as far as possible.
Wherein, the desired value of effective diameter information content can change along with the variation of actual application environment, purpose is to search effective diameter information as much as possible, instructs upstream special link-circuit DPDCH to carry out demodulation, to improve the demodulation performance of upstream special link-circuit DPDCH.
In technical scheme provided by the invention, the quantity of second searcher and search window scope can be determined according to the actual conditions of searcher resource and system resource.The searcher resource is a public resource in the system, its quantity has certain limit, for example hypothesis has 40 searchers in a chip, wherein there are 4 can be assigned with as public searcher resource, after finishing large-scale search mission, should discharge immediately, provide service to give other searchers.Simultaneously, the search window scope of second searcher of use is big more, and the resource that takies system is just many more, and the load of system is also just big more.
If second searcher is two searchers that the search window scope is identical, then on different time periods and different searching position, utilize these two searchers respectively in the left and right sides of the first searcher search window scope adjacent area, carry out the identical path search in each hunting zone.
In addition, second searcher can be used time-multiplexed mode, also can search for other any ways, as long as reach the scope that enlarges search, can search as far as possible that the purpose of many effective diameters information gets final product, the such scheme and the thinking of technical solution of the present invention are identical.
From top embodiment as can be seen, this path search method provided by the invention, do not search effective diameter information at upstream special link-circuit, the quantity that perhaps searches effective diameter information does not reach under the situation of desired value, by using second searcher, the temporary transient scope that enlarges path search is come out the effective diameter search as much as possible that drops on outside the first searcher search window scope.The effective diameter information guiding SIR that use searches estimates, can improve the correctness that SIR estimates, and then improves the robustness of upstream special link-circuit; Whole effective diameter information guiding upstream special link-circuit DPDCH that use searches carry out demodulation, can improve the demodulation performance of upstream special link-circuit DPDCH.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is a specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, a kind of path search method is characterized in that, this method may further comprise the steps at least:
A, startup first searcher carry out path search in the search window scope of first searcher;
If B does not search effective footpath information, the quantity that perhaps searches effective diameter information does not reach desired value, then starts second searcher;
C, the scope that covers with the first searcher search window are the center, continuous path search are carried out in the adjacent area of first searcher, till second searcher can search effective footpath information.
2, path search method according to claim 1 is characterized in that, this method further comprises:
D, use second searcher to search effective footpath information after, the search window scope of first searcher is covered the footpath that searches, and discharges second searcher.
3, path search method according to claim 1 is characterized in that, the quantity of described second searcher and search window scope are determined according to the actual conditions of searcher resource and system resource.
4, path search method according to claim 1 is characterized in that, if described second searcher be one with the identical searcher of the first searcher search window scope, described step B further comprises:
On different time periods and different searching position, utilize the adjacent area of this searcher in the first searcher search window scope, carry out the identical path search in each hunting zone.
5, path search method according to claim 1 is characterized in that, if described second searcher is two searchers that the search window scope is identical, described step B further comprises:
On different time periods and different searching position, utilize these two searchers respectively in the left and right sides of the first searcher search window scope adjacent area, carry out the identical path search in each hunting zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100546197A CN100362766C (en) | 2004-07-22 | 2004-07-22 | Radial search method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100546197A CN100362766C (en) | 2004-07-22 | 2004-07-22 | Radial search method |
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| Publication Number | Publication Date |
|---|---|
| CN1725664A true CN1725664A (en) | 2006-01-25 |
| CN100362766C CN100362766C (en) | 2008-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100546197A Expired - Fee Related CN100362766C (en) | 2004-07-22 | 2004-07-22 | Radial search method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662308B (en) * | 2009-09-29 | 2013-01-16 | 中兴通讯股份有限公司 | Setting method of search window centre and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100291477B1 (en) * | 1998-06-02 | 2001-07-12 | 윤종용 | A sequential searching method on the variable data rate transmission environment in mobile telecommunication systems |
| US6665282B1 (en) * | 1998-12-04 | 2003-12-16 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for configuring a RAKE receiver |
| JP3322240B2 (en) * | 1999-05-10 | 2002-09-09 | 日本電気株式会社 | CDMA receiver |
| JP3279297B2 (en) * | 1999-09-24 | 2002-04-30 | 日本電気株式会社 | Search method and receiving apparatus in CDMA mobile communication receiving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662308B (en) * | 2009-09-29 | 2013-01-16 | 中兴通讯股份有限公司 | Setting method of search window centre and device |
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| CN100362766C (en) | 2008-01-16 |
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