CN1852554A - Alien-frequency hard switching-over method in wide-band CDMA system - Google Patents
Alien-frequency hard switching-over method in wide-band CDMA system Download PDFInfo
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- CN1852554A CN1852554A CNA2005100733681A CN200510073368A CN1852554A CN 1852554 A CN1852554 A CN 1852554A CN A2005100733681 A CNA2005100733681 A CN A2005100733681A CN 200510073368 A CN200510073368 A CN 200510073368A CN 1852554 A CN1852554 A CN 1852554A
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Abstract
The method includes steps: in neighboring cell, setting up pseudo pilot frequency identical to frequency point of basic frequency point in current cell; comparing frequency point of pseudo pilot frequency with basic frequency point in current cell to determine and obtain neighboring cell in cofrequency cell; using pseudo pilot frequency, UE measures signal intensity, quality, and synchronizing information of neighboring cell; when measured signal intensity, quality exceed signal intensity, quality in current cell, radio network controller RNC selects neighboring cell as target cell; using the measured synchronizing information, UE switches to neighboring cell from current cell directly. In normal communication procedure, using requisite measurement for carrying out switching by pseudo pilot frequency, the invention accomplishes hard switching in alien frequencies without use of double receivers, compress mode started up. The invention guarantees higher switching success ratio.
Description
Technical field
The present invention relates to Wideband Code Division Multiple Access (WCDMA) (WCDMA) system handoff technique, be meant the alien-frequency hard switching-over method in a kind of WCDMA system especially.
Background technology
Switching in the WCDMA system can be divided into two big classes, and a class is soft or More Soft Handoff, and another kind of is direct-cut operation.In the soft switching process, subscriber equipment (UE) at first connects with Target cell, and then being connected of disconnection and current area, and promptly soft handover is logical earlier disconnected again.In the direct-cut operation, first interruption U E is connected with current area, sets up new link then, and promptly direct-cut operation is disconnected earlier logical again.
For direct-cut operation, can divide three classes.The frequency direct-cut operation mainly is meant under same frequency and uses direct-cut operation together; The alien frequencies direct-cut operation is meant the switching between different frequency; Switch the switching that is meant between WCDMA and gsm system between system.
For the alien frequencies direct-cut operation, from implementation, can be divided into again based on the switching and the blind switching of measuring.Switching based on measuring is meant that UE measures the signal of adjacent cell, and test result is reported radio network controller (RNC), is determined whether switching by RNC.
For based on the alien frequencies direct-cut operation of measuring, two kinds of implementation methods are arranged usually.
A kind of is the implementation method that starts compact model.In the process of alien frequencies direct-cut operation, UE need measure the carrier wave of adjacent cell, and this measurement then needs certain free time.When UE has only a rf receiver unit, interior at one time can only the decoding to the signal of a frequency.Therefore just the UE in communication process must start compact model, obtains free time, measures.Under the compact model, the base station is compressed data when sending some downlink frame, and UE just can utilize the time that remains to carry out different-frequency measure.The alien-frequency hard switching-over method that starts compact model has several shortcomings:
1, the startup of compact model needs the regular hour, and measuring reporting also of measurement report needs the regular hour, and signal during this period of time might decrease notably, and causes call drop, so handover success rate is relatively low;
2, it is abundant inadequately to start the free time that compact model obtains, so Measuring Time is also abundant inadequately, influences the efficient that system is switched;
3, the compressed gain afterwards of transmission data can reduce, and signal quality also can descend to some extent.For fear of the decline significantly of signal quality, can access and compress the same signal quality of front signal at receiving terminal, can be compressed partial data with higher transmitting power transmission.But when transmitting power was restricted, signal quality still can descend;
4, the startup of compact model also can bring the certain capacity loss.
Another kind is to use the implementation method of double-receiver.In the direct-cut operation,, under the situation that guarantees proper communication, still can measure alien frequencies by another receiver because UE has two cover receiving systems.Compact model is not adopted in this measurement, can carry out early, thereby avoid measuring and switch untimely and call drop that cause.But in this method, UE has adopted two receivers, has therefore increased complexity and the cost of UE.
Soft handover is the switching that is useful between the same frequency sub-district, because same frequency is adopted in two sub-districts, therefore, in the process of proper communication, does not need to start compact model, just can switch necessary measurement.
Summary of the invention
In view of this, the object of the present invention is to provide the method for the alien frequencies direct-cut operation in a kind of broadband CDMA system, use compact model and do not use under the situation of double-receiver avoiding, guarantee high-quality alien frequencies direct-cut operation success rate.
For achieving the above object, the invention provides a kind of method of utilizing pilot beacon to realize the alien frequencies direct-cut operation in the broadband CDMA system, this method comprises:
Step a: the pilot beacon of putting identical frequency with the current area dominant frequency is set in the adjacent area;
Step b:UE obtains the pilot beacon of adjacent area, and relatively the frequency of pilot beacon and the dominant frequency point of current area judge that obtaining the adjacent area is co-frequency cell;
Step c:UE utilizes pilot beacon to measure and signal strength signal intensity, quality and the synchronizing information of current area for the adjacent area of co-frequency cell;
Steps d: when the signal strength signal intensity that records and quality surpassed the signal strength signal intensity of current area and quality, it was Target cell that radio network controller (RNC) is selected the adjacent area, and UE utilizes the synchronizing information that records, and directly switches to the adjacent area from current area.
Wherein, the described pilot beacon of step a three channel: Common Pilot Channel CCPICH, primary synchronization channel P-SCH are set at least, from synchronizing channel S-SCH.
Wherein, the described method of measurement of step c is: by the CCPICH measure signal intensity and the quality of pilot beacon, CCPICH, P-SCH, S-SCH by pilot beacon obtain synchronizing information.
Wherein, the power ratio setting of described three channels is identical with conventional sub-district.
Wherein, the main scrambler spread spectrum information of the described pilot beacon of step a is provided with identical with the main scrambler spread spectrum information of adjacent area dominant frequency point;
The method of the synchronizing information of the described measurement of step c adjacent area is: measure the main scrambler spread spectrum information in the synchronizing information of adjacent area pilot beacon, main scrambler spread spectrum information according to pilot beacon is identical with the main scrambler spread spectrum information of adjacent area dominant frequency point, obtains the main scrambler spread spectrum information of adjacent area dominant frequency point.
Wherein, steps d is utilized the synchronizing information of comprising of adjacent area dominant frequency point of main scrambler spread spectrum information, directly switches on the Traffic Channel of adjacent area from current area.
Wherein, the described pilot beacon that is provided with of step a is: pilot beacon is set in the radio-frequency devices in the base station.
Wherein, the described pilot beacon that is provided with in the radio-frequency devices in the base station is: the frequency of described pilot beacon and adjacent area dominant frequency point are arranged in the same multicarrier radio-frequency devices.
Wherein, the described pilot beacon that is provided with in the radio-frequency devices in the base station is: the frequency of described pilot beacon is arranged in two different radio-frequency devices with adjacent area dominant frequency point.
In sum, the present invention utilizes the pilot beacon that sets to carry out the alien frequencies direct-cut operation.Owing to adopted pilot beacon, when UE is single-receiver, do not start compact model, can carry out different-frequency measure, finish the alien frequencies direct-cut operation.The present invention can utilize pilot beacon in time fully to measure in normal course of communications, thereby reduces probability of call in the handover measurement procedure, guarantees handover success rate between higher alien frequencies.Identical frequency with current area of utilization of the present invention and identical main scrambler spread spectrum information by obtaining the information of adjacent area pilot beacon, can obtain the information of adjacent area dominant frequency point, simplified the process that UE obtains neighboring BS information.
Description of drawings
Fig. 1 is an alien-frequency hard switching-over method block diagram of the present invention.
Embodiment
Describe the present invention in detail below in conjunction with the drawings and specific embodiments.
The present invention utilizes pilot beacon to carry out the alien frequencies direct-cut operation, and main thought is: at first pilot beacon equipment is installed in the base station, and pilot beacon channel and parameter are set, and utilizes pilot beacon to finish necessary measurement with the measurement thought of soft handover then, finishes the alien frequencies direct-cut operation at last.
If sub-district S1, S2 are neighbor cell, the dominant frequency point of S1 sub-district is F1, and the dominant frequency point of S2 sub-district is F2.
Utilize pilot beacon to finish the method for alien frequencies direct-cut operation below in conjunction with Fig. 1 detailed description.
The frequency F1 of pilot beacon is arranged in the radio-frequency devices.Two frequency F1, F2 of S2 sub-district can be separately positioned on two radio-frequency devices, also can share a multicarrier radio-frequency devices.
Dominant frequency point F2 goes up all required channels of carrying WCDMA system, comprises Common Pilot Channel (CCPICH), primary synchronization channel (P-SCH), from synchronizing channel (S-SCH), Common Control Physical Channel (CCPCH), DPCH (DPCH) etc.
For pilot beacon, three channel: CCPICH, P-SCH and S-SCH only are set.Wherein the power ratio of each channel is identical with conventional sub-district.
The frequency F1 of pilot beacon is provided with the main scrambler spread spectrum identical with dominant frequency point F2.
As above-mentioned step, the S2 sub-district that pilot beacon is set is called the pilot beacon sub-district, and frequency F1 and F2 are adopted in the S2 sub-district, and wherein the F1 frequency is pseudo-frequency, and the F2 frequency is the dominant frequency point.S1 and S2 sub-district are neighboring BS relationship, and the S1 sub-district is non-pilot beacon sub-district, adopt frequency F1.The S2 sub-district makes identical just with S1 sub-district dominant frequency point with its pseudo-frequency F1 sign.
In step 103, do not need to start compact model and just can finish the necessary measurement of switching, thus the decreased performance of having avoided compact model to bring.
If UE need switch to the S1 sub-district from the S2 sub-district, then according to above-mentioned pilot beacon method to set up, the pilot beacon that frequency is F2 is set in the S1 sub-district, according to above-mentioned pilot beacon alien-frequency hard switching-over method, can finish switching then.
If want to utilize pilot beacon to carry out the alien frequencies direct-cut operation, in the base station a plurality of pilot beacons can be set, the frequency of each pilot beacon is respectively the dominant frequency point of adjacent area on every side, and these pilot beacons can be arranged in the different radio-frequency devices, also can share the multicarrier radio-frequency devices.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1, the alien-frequency hard switching-over method in a kind of broadband CDMA system is characterized in that, this method comprises:
Step a: the pilot beacon of putting identical frequency with the current area dominant frequency is set in the adjacent area;
Step b:UE obtains the pilot beacon of adjacent area, and relatively the frequency of pilot beacon and the dominant frequency point of current area judge that obtaining the adjacent area is co-frequency cell;
Step c:UE utilizes pilot beacon to measure and signal strength signal intensity, quality and the synchronizing information of current area for the adjacent area of co-frequency cell;
Steps d: when the signal strength signal intensity that records and quality surpassed the signal strength signal intensity of current area and quality, it was Target cell that radio network controller (RNC) is selected the adjacent area, and UE utilizes the synchronizing information that records, and directly switches to the adjacent area from current area.
2, method according to claim 1 is characterized in that, the described pilot beacon of step a is provided with three channel: Common Pilot Channel CCPICH, primary synchronization channel P-SCH at least, from synchronizing channel S-SCH.
3, method according to claim 2 is characterized in that, the described method of measurement of step c is: by the CCPICH measure signal intensity and the quality of pilot beacon, CCPICH, P-SCH, S-SCH by pilot beacon obtain synchronizing information.
4, method according to claim 2 is characterized in that, the power ratio setting of described three channels is identical with conventional sub-district.
5, method according to claim 1 is characterized in that, the main scrambler spread spectrum information of the described pilot beacon of step a is provided with identical with the main scrambler spread spectrum information of adjacent area dominant frequency point;
The method of the synchronizing information of the described measurement of step c adjacent area is: measure the main scrambler spread spectrum information in the synchronizing information of adjacent area pilot beacon, main scrambler spread spectrum information according to pilot beacon is identical with the main scrambler spread spectrum information of adjacent area dominant frequency point, obtains the main scrambler spread spectrum information of adjacent area dominant frequency point.
6, method according to claim 5 is characterized in that, steps d is utilized the synchronizing information of comprising of adjacent area dominant frequency point of main scrambler spread spectrum information, directly switches on the Traffic Channel of adjacent area from current area.
7, method according to claim 1 is characterized in that, the described pilot beacon that is provided with of step a is: pilot beacon is set in the radio-frequency devices in the base station.
8, method according to claim 7 is characterized in that, the described pilot beacon that is provided with in the radio-frequency devices in the base station is: the frequency of described pilot beacon and adjacent area dominant frequency point are arranged in the same multicarrier radio-frequency devices.
9, method according to claim 7 is characterized in that, the described pilot beacon that is provided with in the radio-frequency devices in the base station is: the frequency of described pilot beacon is arranged in two different radio-frequency devices with adjacent area dominant frequency point.
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| CNB2005100733681A CN100415047C (en) | 2005-05-31 | 2005-05-31 | Alien-frequency hard switching-over method in wide-band CDMA system |
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| CNB2005100733681A CN100415047C (en) | 2005-05-31 | 2005-05-31 | Alien-frequency hard switching-over method in wide-band CDMA system |
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| CN101500280B (en) * | 2008-01-29 | 2010-08-18 | 中兴通讯股份有限公司 | Method for softer handoff |
| CN101137217B (en) * | 2007-01-30 | 2010-12-08 | 中兴通讯股份有限公司 | Combined frequency switch judging method |
| CN101969345A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | CDMA digital fiber optic repeater with pilot beacon function and switching method |
| WO2011082672A1 (en) * | 2010-01-05 | 2011-07-14 | 华为技术有限公司 | Method and apparatus for measuring carriers |
| WO2011107056A2 (en) * | 2011-04-20 | 2011-09-09 | 华为技术有限公司 | Method and device for determining target femtocell during handover |
| CN101217801B (en) * | 2008-01-08 | 2011-12-21 | 北京天碁科技有限公司 | A same frequency interference selection method applied in N frequency point networking system |
| CN102308637A (en) * | 2009-02-10 | 2012-01-04 | 高通股份有限公司 | System and method for interference beacon transmission |
| CN102325351A (en) * | 2011-07-14 | 2012-01-18 | 大唐移动通信设备有限公司 | Cell access method and device |
| CN102405664A (en) * | 2009-02-20 | 2012-04-04 | 瑞典爱立信有限公司 | A multicarrier transmission method and apparatus |
| CN102549962A (en) * | 2009-10-01 | 2012-07-04 | 高通股份有限公司 | Method and apparatus for conducting measurements when multiple carriers are supported |
| CN102640533A (en) * | 2009-11-30 | 2012-08-15 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system, and mobile communication method |
| CN101772107B (en) * | 2008-12-31 | 2013-06-05 | 中兴通讯股份有限公司 | Cell reselection method and user equipment |
| CN103650585A (en) * | 2013-07-08 | 2014-03-19 | 华为技术有限公司 | Method and device for cell handover |
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| KR100244193B1 (en) * | 1997-06-30 | 2000-02-01 | 윤종용 | The method of hard handoff using dummy pilot |
| JPH11205843A (en) * | 1998-01-20 | 1999-07-30 | Nec Mobile Commun Ltd | Radio telephone system |
| JP3092589B2 (en) * | 1998-05-07 | 2000-09-25 | 日本電気株式会社 | Handoff control method |
| KR100291476B1 (en) * | 1998-05-25 | 2001-07-12 | 윤종용 | A method and a system for controlling a pilot measurement request order in cellular system |
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| CN101137217B (en) * | 2007-01-30 | 2010-12-08 | 中兴通讯股份有限公司 | Combined frequency switch judging method |
| CN101217801B (en) * | 2008-01-08 | 2011-12-21 | 北京天碁科技有限公司 | A same frequency interference selection method applied in N frequency point networking system |
| CN101500280B (en) * | 2008-01-29 | 2010-08-18 | 中兴通讯股份有限公司 | Method for softer handoff |
| CN101772107B (en) * | 2008-12-31 | 2013-06-05 | 中兴通讯股份有限公司 | Cell reselection method and user equipment |
| CN102308637A (en) * | 2009-02-10 | 2012-01-04 | 高通股份有限公司 | System and method for interference beacon transmission |
| CN102308637B (en) * | 2009-02-10 | 2015-09-30 | 高通股份有限公司 | For disturbing the system and method for beacon transmissions |
| US8682331B2 (en) | 2009-02-10 | 2014-03-25 | Qualcomm Incorporated | System and method for interference beacon transmission |
| CN102405664A (en) * | 2009-02-20 | 2012-04-04 | 瑞典爱立信有限公司 | A multicarrier transmission method and apparatus |
| CN102405664B (en) * | 2009-02-20 | 2014-12-31 | 瑞典爱立信有限公司 | A multicarrier transmission method and apparatus |
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| CN102549962A (en) * | 2009-10-01 | 2012-07-04 | 高通股份有限公司 | Method and apparatus for conducting measurements when multiple carriers are supported |
| CN102640533A (en) * | 2009-11-30 | 2012-08-15 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system, and mobile communication method |
| CN102640533B (en) * | 2009-11-30 | 2015-11-25 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system and method for mobile communication |
| CN102118783B (en) * | 2010-01-05 | 2014-01-08 | 华为技术有限公司 | Carrier measurement method and device |
| WO2011082672A1 (en) * | 2010-01-05 | 2011-07-14 | 华为技术有限公司 | Method and apparatus for measuring carriers |
| CN101969345A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | CDMA digital fiber optic repeater with pilot beacon function and switching method |
| WO2011107056A3 (en) * | 2011-04-20 | 2012-03-15 | 华为技术有限公司 | Method and device for determining target femtocell during handover |
| WO2011107056A2 (en) * | 2011-04-20 | 2011-09-09 | 华为技术有限公司 | Method and device for determining target femtocell during handover |
| CN102325351A (en) * | 2011-07-14 | 2012-01-18 | 大唐移动通信设备有限公司 | Cell access method and device |
| CN102325351B (en) * | 2011-07-14 | 2014-02-12 | 大唐移动通信设备有限公司 | Cell access method and device |
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| CN103650585A (en) * | 2013-07-08 | 2014-03-19 | 华为技术有限公司 | Method and device for cell handover |
| CN103650585B (en) * | 2013-07-08 | 2017-11-21 | 华为技术有限公司 | A kind of method and apparatus of cell switching |
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