CN100349493C - Method for reinforcing search under omnidirectional emission sector receiving mode - Google Patents
Method for reinforcing search under omnidirectional emission sector receiving mode Download PDFInfo
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- CN100349493C CN100349493C CNB2004100895198A CN200410089519A CN100349493C CN 100349493 C CN100349493 C CN 100349493C CN B2004100895198 A CNB2004100895198 A CN B2004100895198A CN 200410089519 A CN200410089519 A CN 200410089519A CN 100349493 C CN100349493 C CN 100349493C
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Abstract
The present invention relates to a multi-path search technique in the field of mobile communication, and discloses a method for reinforcing search under an omnidirectional emission sector receiving mode. Thus, when a terminal under the omnidirectional emission sector receiving mode moves, the dropping probability of the terminal is reduced. In the present invention, although independent polling processing is carried out on each sector just like the prior art, polling results are not independently processed, the polling results are uniformly processed in a radio link set, and the search window position of the three sectors are uniformly adjusted. Thus, the search window position of each radio link and the search window position of the radio link with maximum effective diameter SNR in the radio link set are the same.
Description
Technical field
The present invention relates to the Multipath searching technology of moving communicating field, particularly the enhancing Multipath searching technology under the omnidirectional emission sector receiving mode.
Background technology
Along with the development of mobile communication, 3G (Third Generation) Moblie (The Third Generation is called for short " 3G ") progressively moves towards commercial.At the 3G network first stage of construction, general not high to the requirement of network capacity, but the covering of network but can directly have influence on user's experience, becomes the user and passes judgment on one of most important standard of network quality, thereby directly has influence on the brand image of mobile operator and user's loyalty.How with lower one-tenth original build one effectively cover and capacity can be with the increase of number of users the 3G network of modular smooth evolution, just become one of problem that mobile operator is concerned about the most.
It is exactly the solution that proposes under this background that the theaomni-directional transmission sector receives (Omni Transmit Sector Receive is called for short " OTSR ").The traditional coverage mode in traditional base station has two kinds usually: omnidirectional and orientation.Omnidirectional adopts at the station power amplifier (Power Amplifier is called for short " PA "), and its antenna is an omnidirectional antenna; Directing Station adopts three PA, and its antenna is a directional antenna.OTSR combines traditional omnidirectional and directional technology, and theaomni-directional transmission is adopted in emission, receives to adopt 3 sectors to receive, and can reduce the investment to PA under the prerequisite that does not reduce coverage like this.Because directional antenna is higher than the gain of omnidirectional antenna, covering radius is farther, adopts OTSR to require to reduce the networking cost under the little situation at the networking initial capacity, improves coverage.Need to prove, do not need to adopt in addition an omnidirectional antenna during transmission, can realize that omnidirectional sends to three directional antennas the descending power mean allocation of PA output by separator.This OTSR configuration can be reduced in the investment of PA aspect as much as possible, owing to adopt directional antenna equally, its coverage effect almost is equal to Directing Station simultaneously.Along with user's increase, when the base station needs dilatation, only need to remove separator, increase by two PA and just OTSR can be upgraded to Directing Station.
The schematic diagram that transmits and receives of OTSR as shown in Figure 1.Wherein, the base station is positioned at the center of circle, when receiving subscriber signal, receives three subscriber signals in the sector respectively; During base station transmit signals, omnidirectional sends in 360 ° scope.
Because same transmitting can be transmitted by a plurality of different paths, therefore there is the phenomenon of multipath transmission in the mobile communication system.3G is owing to adopted code division multiple access (the CodeDivision Multiple Access that can resist the multipath interference, be called for short " CDMA ") technology, therefore can adopt RAKE receiver to carry out rake when receiving receives, improve received signal to noise ratio (Signal Noise ratio is called for short " SNR ").When multipath reception, need in a scope, search for multipath based on pilot tone, wherein, the scope of search multipath is called search window.
In the time of the search multipath, when head and the tail footpath a good distance off in search window, improper the causing of position that search window is placed can not all be included in effective diameter in the search window, perhaps when new footpath occurring again outside window, need usually to use and adopt the search technique of enhancing property in a bigger scope, to search for multipath.Polling technique is exactly a kind of of enhancing property search technique.
The hunting zone schematic diagram of employing polling technique search multipath as shown in Figure 2.Dash box is represented the scope of normal searching windown, and blank box is represented the hunting zone of poll search.Poll is to search for multipath in a scope bigger than normal searching windown, according to the result that searches the search window position of normal searching is carried out suitable adjustment then, thereby reaches the purpose that strengthens the multipath reception effect.
In the prior art scheme, when under the OTSR pattern, using polling technique, each Radio Link under the OTSR pattern is independently handled by polling algorithm, i.e. transmitting for a terminal, independently carry out poll search multipath in three sectors respectively, the search window position for the Radio Link of same terminal in three sectors is separate.
Need to prove that in this article, think that same terminal all may have Radio Link in each sector, these Radio Links constitute the Radio Link collection of this terminal jointly.
In actual applications, there is following problem in such scheme: terminal may cause call drop when mobile in different sectors.
Cause the main cause of this situation to be, under the OTSR pattern, the mode that adopts poll is independently on each sector during enhancing property Multipath searching, thereby may produce empty footpath in some sector causes search window to depart from the normal position, when moving to these sectors, terminal can search for like this less than multipath, cause the link step-out, thereby cause call drop.For example, among Fig. 1, when terminal is in the intersection A point of two sectors, because the overlay area difference of three antennas, the quality of the Radio Link of this terminal will be poor in the residing sector of B point, might just there be multipath, if but this sector searches empty footpath, the normal position that causes the normal searching windown of this terminal in this sector to depart from search window during poll, then when terminal when the A point moves to the B point, can search for, cause the link step-out, finally cause call drop less than multipath.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of reinforcing search under omnidirectional emission sector receiving mode, when making terminal under the OTSR pattern move, reduces terminal call drop probability.
For achieving the above object, the invention provides a kind of method of reinforcing search under omnidirectional emission sector receiving mode, comprise following steps:
A carries out poll for each terminal respectively to each Radio Link in its Radio Link collection, obtains having in this Radio Link collection the Radio Link of effective diameter and signal to noise ratio maximum;
B is adjusted into the search window position unification of each Radio Link in the described Radio Link collection identical by the determined search window position of poll with the Radio Link of described signal to noise ratio maximum.
Wherein, described steps A comprises following substep:
Then enter steps A 2 as if the discovery effective diameter behind the described Radio Link in the described Radio Link collection of A1 poll, otherwise enter steps A 4;
A2 judges that whether this Radio Link is that first poll goes out to have the Radio Link of effective diameter in the described Radio Link collection, is historical information if then write down the multipath information of this Radio Link, otherwise enters steps A 3;
Whether A3 judges the signal to noise ratio of this Radio Link more than or equal to the signal to noise ratio in the described historical information, if then with the described historical information of multipath information updating of this Radio Link, otherwise enters steps A 4;
A4 repeating said steps A1, A2 and A3, all Radio Links in the intact described Radio Link collection of poll;
Comprise following substep among the described step B:
The search window position that obtains according to described historical record is adjusted in the search window position unification of each Radio Link in the described Radio Link collection.
Described historical information comprises: the positional information of described effective diameter, the wireless link information of described effective diameter correspondence and signal to noise ratio.
The positional information of the described effective diameter of record comprises first path position and last path position.
In the described steps A,, then keep the search window position of the described Radio Link in this Radio Link collection constant if having effective diameter without any a described Radio Link in the described Radio Link collection.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, though the present invention program carries out the same each sector with prior art independently poll processing, but it is independent on to poll result's processing, but the poll result is handled in unification in the Radio Link collection, the unified search window position of adjusting in three sectors makes Radio Link concentrate the search window position of each Radio Link identical with the search window position of the Radio Link of effective diameter SNR maximum.
Difference on this technical scheme, brought comparatively significantly beneficial effect, in the present invention promptly, because the poll result unifies to handle in the Radio Link collection, therefore avoided owing to the search window that reason caused such as void footpath move apart entopic problem, thereby when having guaranteed that terminal moves particularly between different sectors when mobile, thereby can not cause step-out to cause call drop for above-mentioned reasons, realized mobile network's seamless link, make network obtain optimization, improved speech quality greatly.
Description of drawings
Fig. 1 is the schematic diagram that transmits and receives of OTSR;
Fig. 2 is the hunting zone schematic diagram that adopts polling technique search multipath;
Fig. 3 is the flow chart that carries out the poll search in the Radio Link collection of a terminal according to a preferred embodiment of the present 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.
Basic principle of the present invention at first is described.The method that strengthens search under the OTSR pattern of the present invention is unified the poll Search Results to handle in the Radio Link collection, the comprehensive relatively poll result of Radio Link collection, finally draw maximum signal to noise ratio (Signal Noise Ratio, be called for short " SNR ") multipath under the situation, thereby in a plurality of sectors the unified position of determining search window.Because the unified poll Search Results of handling only can be determined search window according to the multipath of maximum S R in the Radio Link collection, can not produce empty footpath, therefore can avoid terminal call drop phenomenon when mobile between different sectors.
According to the flow process of in the Radio Link collection of a terminal, carrying out poll search of a preferred embodiment of the present invention as shown in Figure 3.
At first enter step 110, a Radio Link in the poll Radio Link collection.Wherein, this Radio Link is in the Radio Link collection of terminal correspondence, poll handle and prior art identical.
Then enter step 120, judge whether to find effective diameter,, otherwise enter step 160 if then enter step 130.Wherein, judge that whether the standard of effective diameter is well known in the art, do not describe in detail at this.
In step 130, judge that whether this Radio Link is that Radio Link concentrates first poll to go out the Radio Link of effective diameter, if then enter step 150, otherwise enters step 140.In this step, can whether be the Radio Link that sky judges whether to go out for first poll effective diameter by the historical record of inquiring about this Radio Link collection, if historical record is that sky then is, otherwise be not.Wherein, historical record comprises relevant with an effective diameter: effective diameter positional information, wireless link information and Radio Link SNR information.
In step 140, whether the SNR that judges this Radio Link if then enter step 150, otherwise enters step 160 more than or equal to the historical SNR in this Radio Link collection historical record.The SNR of the Radio Link that wherein, historical SNR before is polled to for it with maximum S R.
In step 150, upgrade historical record, write down this effective diameter and be historical footpath, this Radio Link is historical Radio Link, the SNR of this Radio Link is historical SNR.Also upgrade historical record when why the SNR of this Radio Link equates with historical SNR, be the moment of considering this Radio Link poll to be later than historical record, Radio Link in the historical record may change, so the effective diameter that this Radio Link is polled to has more ageing.Need to prove, in the log history footpath, the position in first footpath of record and footpath, end.
In step 160, judge whether all Radio Links in the intact Radio Link collection of poll, if then enter step 170, continue the poll Radio Link of poll not as yet otherwise enter step 110.Under the OTSR pattern, may there be three Radio Links in a terminal in a base station range.
In step 170, judge whether there is effective poll result in the historical record, if then enter step 180, otherwise finish.This step comes down to judge in the scope of three sectors that cover in this base station whether search effective diameter, if there is effective diameter, then is the multipath of the Radio Link of the SNR maximum in all Radio Links certainly.
In step 180, the search window position that obtains according to historical record is adjusted in all search window unifications in the Radio Link collection.Need to prove, in this step, the search window of all Radio Links in the Radio Link collection is adjusted to same position.
Need to prove, clear for flow process, the Radio Link in Radio Link collection of poll of above-mentioned flow process is in actual treatment, for separate in each sector, the carrying out of the poll of the Radio Link in the Radio Link collection, there is no the branch of sequencing.Those of ordinary skill in the art are appreciated that just clear on explaining of such explanation, do not influence essence of the present invention.
Thereby being appreciated that equally, those of ordinary skill in the art can carry out the search window position that Multipath searching is determined definite all Radio Links of search window position realization to all terminals in the base station range according to the method described above.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (5)
1. the method for a reinforcing search under omnidirectional emission sector receiving mode is characterized in that, comprises following steps:
A carries out poll for each terminal respectively to each Radio Link in its Radio Link collection, obtains having in this Radio Link collection the Radio Link of effective diameter and signal to noise ratio maximum;
B is adjusted into the search window position unification of each Radio Link in the described Radio Link collection identical by the determined search window position of poll with the Radio Link of described signal to noise ratio maximum.
2. the method for reinforcing search under omnidirectional emission sector receiving mode according to claim 1 is characterized in that, described steps A comprises following substep:
Then enter steps A 2 as if the discovery effective diameter behind the described Radio Link in the described Radio Link collection of A1 poll, otherwise enter steps A 4;
A2 judges that whether this Radio Link is that first poll goes out to have the Radio Link of effective diameter in the described Radio Link collection, is historical information if then write down the multipath information of this Radio Link, otherwise enters steps A 3;
Whether A3 judges the signal to noise ratio of this Radio Link more than or equal to the signal to noise ratio in the described historical information, if then with the described historical information of multipath information updating of this Radio Link, otherwise enters steps A 4;
A4 repeating said steps A1, A2 and A3, all Radio Links in the intact described Radio Link collection of poll;
Comprise following substep among the described step B:
The search window position that obtains according to described historical record is adjusted in the search window position unification of each Radio Link in the described Radio Link collection.
3. the method for reinforcing search under omnidirectional emission sector receiving mode according to claim 2 is characterized in that, described historical information comprises: the positional information of described effective diameter, the wireless link information of described effective diameter correspondence and signal to noise ratio.
4. the method for reinforcing search under omnidirectional emission sector receiving mode according to claim 3 is characterized in that, the positional information of the described effective diameter of record comprises first path position and last path position.
5. the method for reinforcing search under omnidirectional emission sector receiving mode according to claim 1, it is characterized in that, in the described steps A, if have effective diameter without any a described Radio Link in the described Radio Link collection, then keep the search window position of the described Radio Link in this Radio Link collection constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100895198A CN100349493C (en) | 2004-12-14 | 2004-12-14 | Method for reinforcing search under omnidirectional emission sector receiving mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100895198A CN100349493C (en) | 2004-12-14 | 2004-12-14 | Method for reinforcing search under omnidirectional emission sector receiving mode |
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| CN1791259A CN1791259A (en) | 2006-06-21 |
| CN100349493C true CN100349493C (en) | 2007-11-14 |
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| CN102547821B (en) * | 2010-12-14 | 2015-09-02 | 中兴通讯股份有限公司 | A kind of descending coverage prediction method of theaomni-directional transmission directional reception site type and device |
| CN102638807B (en) * | 2011-02-15 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of descending interference defining method and device |
Citations (9)
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| US6055264A (en) * | 1997-08-01 | 2000-04-25 | Nokia Mobile Phones Limited | Method and apparatus for fast acquisition and multipath search in a spread spectrum system |
| WO2001026258A1 (en) * | 1999-09-30 | 2001-04-12 | Motorola Inc. | Method and apparatus for estimating a channel parameter |
| WO2002029996A2 (en) * | 2000-10-02 | 2002-04-11 | Koninklijke Philips Electronics N.V. | Method and apparatus for combined finger management and finger lock for multipath signals in a wireless communication system. |
| GB2370725A (en) * | 2000-12-27 | 2002-07-03 | Korea Electronics Telecomm | Optimal search method of DS-CDMA signal composed of time multiplexed known symbols and unknown symbols |
| WO2003032671A1 (en) * | 2001-09-28 | 2003-04-17 | Sanyo Electric Co., Ltd. | Cellular telephone |
| CN1461536A (en) * | 2000-03-31 | 2003-12-10 | 高通股份有限公司 | Gynamic adjustment of search window size in response to signal strength |
| WO2004021732A2 (en) * | 2002-08-27 | 2004-03-11 | Qualcomm Incorporated | Idle mode cell reacquisition and reselection in a wireless communication system |
| WO2004052039A1 (en) * | 2002-12-02 | 2004-06-17 | Nokia Corporation | Estimation of a signal delay |
| WO2004068868A2 (en) * | 2003-01-31 | 2004-08-12 | Nokia Corporation | System and method for extending neighboring cell search window |
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2004
- 2004-12-14 CN CNB2004100895198A patent/CN100349493C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6055264A (en) * | 1997-08-01 | 2000-04-25 | Nokia Mobile Phones Limited | Method and apparatus for fast acquisition and multipath search in a spread spectrum system |
| WO2001026258A1 (en) * | 1999-09-30 | 2001-04-12 | Motorola Inc. | Method and apparatus for estimating a channel parameter |
| CN1461536A (en) * | 2000-03-31 | 2003-12-10 | 高通股份有限公司 | Gynamic adjustment of search window size in response to signal strength |
| WO2002029996A2 (en) * | 2000-10-02 | 2002-04-11 | Koninklijke Philips Electronics N.V. | Method and apparatus for combined finger management and finger lock for multipath signals in a wireless communication system. |
| GB2370725A (en) * | 2000-12-27 | 2002-07-03 | Korea Electronics Telecomm | Optimal search method of DS-CDMA signal composed of time multiplexed known symbols and unknown symbols |
| WO2003032671A1 (en) * | 2001-09-28 | 2003-04-17 | Sanyo Electric Co., Ltd. | Cellular telephone |
| WO2004021732A2 (en) * | 2002-08-27 | 2004-03-11 | Qualcomm Incorporated | Idle mode cell reacquisition and reselection in a wireless communication system |
| WO2004052039A1 (en) * | 2002-12-02 | 2004-06-17 | Nokia Corporation | Estimation of a signal delay |
| WO2004068868A2 (en) * | 2003-01-31 | 2004-08-12 | Nokia Corporation | System and method for extending neighboring cell search window |
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| CN1791259A (en) | 2006-06-21 |
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