CN100361556C - Method for locating interference source in up going route - Google Patents

Method for locating interference source in up going route Download PDF

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Publication number
CN100361556C
CN100361556C CNB2004101024813A CN200410102481A CN100361556C CN 100361556 C CN100361556 C CN 100361556C CN B2004101024813 A CNB2004101024813 A CN B2004101024813A CN 200410102481 A CN200410102481 A CN 200410102481A CN 100361556 C CN100361556 C CN 100361556C
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China
Prior art keywords
interference source
up going
going route
district
base station
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CNB2004101024813A
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Chinese (zh)
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CN1798414A (en
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刘鹏
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华为技术有限公司
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Abstract

The present invention discloses a method for positioning an up-going interference source. In the present invention, after a base station discovers that a district has up-going interference and reports to a remote operation maintenance terminal, the remote operation maintenance terminal positions an up-going interference source through intelligent antenna beam direction angles reported by the district and a base station at a neighboring area thereof. The present invention does not need the participation of a maintenance person in the process of reporting the direction of the up-going interference, reduces the skill requirement of the maintenance person, improves work efficiency, and simultaneously, reduces the work load of the maintenance person.

Description

A kind of method of locating interference source in up going route

Technical field

The present invention relates to the signal detection technique field, be specifically related to a kind of method of locating interference source in up going route.

Background technology

In base station design, require upward signal in a dynamic range, separate and be in harmonious proportion decoding the signal to noise ratio of link is also had certain requirement.If the interference signal that exists a large number of users not expect in the up receiving belt, will have influence on the quality of up link, for the wireless system that uses the power control technology, the transmitting power of portable terminal will be higher, thereby reduce the dynamic range threshold degree of base station processing signals, reduce the user capacity in the base station coverage area, even up channel is directly blocked in the strong jamming meeting that has, cause the user can't insert or insert difficulty, therefore, get rid of uplink interference, normal function and performance for ensureing the base station have great significance.

For narrowband systems, as Global Systems for Mobile communications (GSM, Global System for MobileCommunications), code division multiple access (CDMA, Code Division Multiple Address) etc., by obtaining the up received signal intensity indication (RSSI in base station, Received Signal StrengthIndication), can judge current uplink interference situation; For broadband system, as Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Address), CDMA2000, TD SDMA (TD-SCDMA, Time Division-Synchronous CDMA) etc., by obtaining the up reception main broadband internal power (RTWP in base station, Received Total Wideband Power), can judge current uplink interference situation.When user in base station coverage area more after a little while, RSSI or RTWP will maintain the end level of making an uproar substantially, and the existence of uplink interference will make received energy make an uproar the end of apparently higher than.Therefore, can judge according to the value of RSSI or RTWP whether certain sub-district exists uplink interference.

At present, the base station is used the fixing Antenna Positioning interference source in up going route of wave beam usually.When finding that there is uplink interference in the base station, the attendant uses base station testing instrument and directional antenna to search interference source in up going route, its process is: at first, the attendant utilizes directional antenna that different directions is scanned in the base station, observe the inband signaling intensity that the base station testing instrument receives, if the signal strength signal intensity of certain direction is bigger, just think that may there be interference source in up going route in this direction; The attendant changes the place and carries out same test and judgement then; At last, utilize the position that estimates interference source in up going route in the uplink interference direction of different location test, the attendant is the crossover location that estimates different uplink interference directions usually, thinks that this position is the location of interference source in up going route.For the interference that produces by the directional jamming source, can only be in some orientation detection to disturbing; For edge cell towards interference, can only be in some cell detection to disturbing, differing obtains to have the directional information of obvious interference surely.In both cases, can adopt sport car to advance always, thereby determine the position of interference source along the direction of high reject signal.So-called sport car refers on tester or frequency spectrograph and connects directional antenna, drives to advance near suspection has the road of interference source or building, by the sensing of mobile directional antenna, and the variation of observation signal intensity, finds the position of interference source.The shortcoming of prior art is:

1, must the attendant arrive scene, inefficiency.Because the wave beam of antenna is fixed, so can not long-range adjustment deflection, whole process all must be finished by the attendant is auxiliary, has not only taken manpower but also time-consuming, when building a station on a large scale, the method for this locating interference source in up going route obviously is difficult to satisfy the requirement of project progress.

2, be subjected to climatic effect big.This method must the attendant be carried instrument to outdoor test, and under the situation of bad weather, attendant's inconvenience of going on a journey has increased difficulty for searching interference source in up going route.

3, the attendant there is certain technical ability requirement.The attendant must skillfully use instrument, and must judge whether uplink interference might exist according to test result, must estimate the position of interference source in up going route at last according to different uplink interference directions, different attendants is because the difference of technical ability own may be made different judgements.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method of locating interference source in up going route, in the technical ability requirement that reduces the attendant, improves the efficient of locating interference source in up going route.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of method of locating interference source in up going route, this method comprises:

Whether A, the base station detected cells of supporting and be equipped with smart antenna and Operation and Maintenance software exist uplink interference, if then to the remote operation maintaining terminal to report;

The base station of B, this sub-district of remote operation maintaining starting terminal and its adjacent area reports the intelligent antenna beam deflection;

C, remote operation maintaining terminal are determined the position of interference source in up going route according to the intelligent antenna beam deflection that reports.

The intelligent antenna beam deflection that the described basis of step C reports determines that the position of interference source in up going route is, the remote operation maintaining terminal is drawn the beam direction angle straight line of sub-district according to the beam direction angle on digital network planning map, this straight line distributes according to all directions angle straight line at last and determines the position of interference source in up going route through reporting residing longitude and latitude position on digital network planning map, sub-district of this deflection.

The described all directions of step C angle straight line is distributed as and converges at a bit, and then this is the position of interference source in up going route.

The described all directions of step C angle straight line is distributed as the zone that described straight line pools, and should the zone be the interference source in up going route present position then.

The described all directions of step C angle straight line is distributed as a straight line that points to particular orientation, and then this straight line position is the interference source in up going route present position.

The described base station of step B reports the intelligent antenna beam deflection, and to be the base station report after to the ordering of beam direction angle according to the intensity of smart antenna received signal.

The intelligent antenna beam deflection that the described base station of step B reports is the beam direction angle of the strong cohesiveness collection of letters correspondence of smart antenna.

The residing network in the described sub-district of steps A is a narrowband systems, and whether the base station is detected this sub-district and existed the step of uplink interference to comprise, judges whether base station received signal intensity indication RSSI surpasses threshold value, if judge that then there is uplink interference in this sub-district; Otherwise, judge that there is not uplink interference in this sub-district.

The residing network in the described sub-district of steps A is a broadband system, and whether the base station is detected this sub-district and existed the step of uplink interference to comprise, judges that the base station receives main broadband internal power RTWP and whether surpasses threshold value, if judge that then there is uplink interference in this sub-district; Otherwise, judge that there is not uplink interference in this sub-district.

Further comprise after the described step C, preserve current beam direction angle.

Further comprise after the described steps A, before the step B, judge that this uplink interference is stationarity uplink interference, periodically uplink interference or randomness uplink interference.

This uplink interference of described judgement is that stationarity uplink interference, periodicity uplink interference or the step of randomness uplink interference comprise, detect the situation of change of received signal intensity in a period of time, if the lasting height of making an uproar than the end of received signal intensity judges that this uplink interference is the stationarity uplink interference; If received signal intensity is cyclic variation, judge that this uplink interference is a PERIODIC INTERFERENCE; If the peak value of received signal does not have periodically to judge that this uplink interference is the randomness uplink interference apparently higher than preset threshold and received signal.

The number of the described adjacent area of step B is more than or equal to 2.

Compared with prior art, the present invention after the base station finds that there is uplink interference in the sub-district and reports the remote operation maintaining terminal, the intelligent antenna beam deflection straight line locating interference source in up going route that the base station of remote operation maintaining terminal by this sub-district and adjacent area thereof reports.The process of reporting uplink interference radiating way of the present invention does not need attendant's participation, has reduced the technical ability requirement to the attendant, has improved operating efficiency, can not be subjected to climatic effect yet; Simultaneously, also reduced the work of maintenance personnel amount.

Description of drawings

Fig. 1 is the flow chart of the specific embodiment of locating interference source in up going route of the present invention;

Fig. 2 is the process schematic diagram of the present invention's locating interference source in up going route on digital network planning map.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

Locating interference source in up going route of the present invention is at first through three steps:

1, antenna system is installed in the base station, so that smart antenna is supported in this base station.So-called smart antenna can carry out self-adjusting antenna according to dynamic signal environment exactly, and the beam direction of antenna can be adjusted according to the strongest upward signal or interference when receiving and transmitting.Smart antenna can improve the directive gain of antenna, by the up-downgoing covering and the capacity of the balanced raising of certain algorithm system, reduces the up-downgoing multiple access and disturbs, and reduce decline.The smart antenna that two kinds of fundamental types are arranged at present: fixed beam intelligent antenna and adaptive smart antenna, the former uses aerial array to form a plurality of wave beams, select the wave beam of certain maximum enhancing signal to receive and launch by algorithm, the latter adjusts direction according to noise, interference, multipath and user distribution, forms the wave beam zero point in space in the strong jamming direction.Regardless of the smart antenna of the sort of type, can both determine to point to the beam direction angle of the strongest upward signal or interference radiating way.

2, base station fitting operation maintenance software, the base station is by intelligent antenna beam deflection and the received signal strength measurement and the remote monitoring of accepting Remote client of this each sub-district, base station of this software records.

3, the remote operation maintaining terminal is installed for the above wireless system, the graphical NE management of this terminal support, each base station is a network element, can show digital network planning map on the terminal interface, the base station can be presented on the network planning map, and the longitude and latitude mark is accurate.By interface protocol, the remote operation maintaining terminal can say the word to the base station operation maintenance software, allows the base station operation maintenance software report the data of record.

Fig. 1 is the flow chart of the specific embodiment of locating interference source in up going route, and as shown in Figure 1, the step of locating interference source in up going route of the present invention is as follows:

Step 101: the Operation and Maintenance software of supporting and be equipped with the base station of smart antenna judges that there is uplink interference in certain sub-district and gives the remote operation maintaining terminal to report.

The Operation and Maintenance software of base station is judged when whether the sub-district exists uplink interference, for narrowband systems, realizes by the value of judging RSSI, if RSSI, judges that there is uplink interference in the sub-district greater than threshold value; Otherwise, judge that there is not uplink interference in the sub-district; For broadband system, realize by the value of judging RTWP, if RTW, judges that there is uplink interference in the sub-district greater than threshold value; Otherwise, judge that there is not uplink interference in the sub-district.

Here, the threshold value of RSSI or RTWP can obtain by emulation, also can rule of thumb be provided with.

Step 102: the base station of this sub-district of remote operation maintaining starting terminal and adjacent area reports signal strength signal intensity to come the beam direction angle of the smart antenna received signal correspondence of top n respectively.

Here, the number of adjacent area is more preferably greater than equaling 2, this be because, when having bigger building around the sub-district, what the sub-district received might be interference signal signal after reflection, and what this moment, the base station reported is wrong beam direction angle, therefore, increase the number of adjacent area, help to obtain more accurately the beam direction angle.

The Operation and Maintenance software of base station can be according to reporting after the setting of Remote client or the data processing of order request to each sub-district again.For example, the base station that the remote operation maintaining terminal also can start this sub-district and adjacent area reports the beam direction angle of the strong cohesiveness collection of letters correspondence of smart antenna respectively, and detailed process is: the remote operation maintaining terminal will report peaked order to issue each base station; The Operation and Maintenance software of each base station compares according to the received signal strength measurement of order to the sub-district of this base station, obtains the maximum receiving signal measured value of this sub-district; The Operation and Maintenance software of base station reports the remote operation maintaining terminal with the beam direction angle of this maximum receiving signal measured value correspondence then.

Step 103: according to the beam direction angle that reports, the remote operation maintaining terminal is drawn the beam direction angle straight line of each sub-district on digital network planning map, determines the position of interference source in up going route according to the distribution of deflection straight line.

Wherein, deflection straight line process reports residing longitude and latitude position on the network planning map, sub-district of this deflection, the datum line of deflection straight line, and different producers may be different, generally all is made as warp or parallel.

The deflection straight line distributes roughly following three kinds of situations:

A, has only a deflection straight line.For the directional jamming source, because interference emission is to point to certain particular orientation,, generally have only a sub-district can detect interference Gu this, the result can only obtain a beam direction angle straight line; For edge cell towards interference owing to almost do not have relative adjacent area that extraneous information is provided, have only a sub-district can trace into interference, the result also has to a beam direction angle straight line.Therefore, in both cases, can only obtain the concrete orientation of interference source, need to rely on sport car further to determine the position of interference source.

B, deflection straight line converge to a bit or less zone.For the interference source in up going route that is in open area, the beam direction angle straight line of related cell can converge to a bit substantially or one than the zonule, at this moment, promptly the decidable interference source in up going route is promptly at this point or place, this zonule.

C, deflection straight line converge to bigger zone.For the interference source in up going route that is in non-open area, the beam direction angle straight line of related cell can converge to a bigger zone, at this moment, can finally determine the particular location of interference source in up going route by sport car.

A plurality of convergent points are arranged or converge the zone for the deflection straight line, handle earlier point or zone that the deflection straight line of intensity bigger received signal correspondence converges.

In addition, also can directly analyze, thereby the crossover location that estimates each uplink interference direction is determined the position of interference source in up going route the intelligent antenna beam deflection that reports.

Step 104: the remote operation maintaining terminal is preserved current beam direction angle straight line, as the reference of later locating interference source in up going route.

For certain specific cell, usually the position of interference source is all more fixing, therefore when having interference source in up going route, preserve beam direction angle straight line, and upgrade at any time, after long-time the observation, just can obtain several stable, change little deflection straight line, the reference of locating interference source in up going route after these straight lines can be used as.

Fig. 2 has provided the process schematic diagram of the present invention's locating interference source in up going route on digital network planning map, and wherein, S1, S2, S3 represent different base stations respectively, and A, B, C represent the different sectors of smart antenna respectively.As can be seen from Figure 2, on digital network planning map, the beam direction angle straight line of the strong cohesiveness collection of letters correspondence of the smart antenna among base station S1, S2, the S3 is approximate to be converged at a bit, and then the decidable interference source in up going route is positioned at this point maybe near this point, promptly justifies inner region shown in the figure.

In actual applications, after there was uplink interference in the base station reporting subdistrict, the remote operation maintaining terminal can judge further that also this uplink interference is stationarity uplink interference, periodicity uplink interference or randomness uplink interference.

The stationarity uplink interference is to be caused by the signal that fixing interference source discharges, and determines by the following method: observe the situation of change of received signal intensity in a period of time, the height if signal strength signal intensity continues to make an uproar than the end just thinks that this interference is the stationarity uplink interference.

Periodically the cycle of uplink interference obtains by the following method: the base station that starts the sub-district reports the intensity of the received signal of the intelligent antenna beam deflection sensing in the certain hour scope, and draw the waveform of signal strength signal intensity in this time domain scope, if waveform is cyclic variation, just think that this uplink interference is the periodicity uplink interference, the variation of the intensity by analyzing these received signals, just can observe out the time response of this cell uplink interference variations, thereby obtain the cycle of this sub-district generating period uplink interference.For the purpose of accurately, can establish time range widelyer earlier, roughly estimate uplink interference week after date, less time range is set again, further accurately estimate the cycle of uplink interference.

The randomness uplink interference is judged by the following method: observe the situation of change of received signal intensity in a period of time, if the peak value of received signal does not have periodically just to think that this uplink interference is the randomness uplink interference apparently higher than threshold values of setting and signal.

No matter it is pointed out that it is macro base station or little base station, all can use the inventive method locating interference source in up going route.

The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1, a kind of method of locating interference source in up going route is characterized in that, this method comprises:
Whether A, the base station detected cells of supporting and be equipped with smart antenna and Operation and Maintenance software exist uplink interference, if then to the remote operation maintaining terminal to report;
The base station of B, this sub-district of remote operation maintaining starting terminal and its adjacent area reports the intelligent antenna beam deflection;
C, remote operation maintaining terminal are determined the position of interference source in up going route according to the intelligent antenna beam deflection that reports.
2, the method for locating interference source in up going route as claimed in claim 1, it is characterized in that, the intelligent antenna beam deflection that the described basis of step C reports determines that the position of interference source in up going route is, the remote operation maintaining terminal is drawn the beam direction angle straight line of sub-district according to the beam direction angle on digital network planning map, this straight line distributes according to all directions angle straight line at last and determines the position of interference source in up going route through reporting residing longitude and latitude position on digital network planning map, sub-district of this deflection.
3, the method for locating interference source in up going route as claimed in claim 2 is characterized in that, the described all directions of step C angle straight line is distributed as and converges at a bit, and then this is the position of interference source in up going route.
4, the method for locating interference source in up going route as claimed in claim 2 is characterized in that, the described all directions of step C angle straight line is distributed as the zone that described straight line pools, and should the zone be the interference source in up going route present position then.
5, the method for locating interference source in up going route as claimed in claim 2 is characterized in that, the described all directions of step C angle straight line is distributed as a straight line that points to particular orientation, and then this straight line position is the interference source in up going route present position.
6, the method for locating interference source in up going route as claimed in claim 1 is characterized in that, the described base station of step B reports the intelligent antenna beam deflection, and to be the base station report after to the ordering of beam direction angle according to the intensity of smart antenna received signal.
7, the method for locating interference source in up going route as claimed in claim 1 is characterized in that, the intelligent antenna beam deflection that the described base station of step B reports is the beam direction angle of the strong cohesiveness collection of letters correspondence of smart antenna.
8, the method for locating interference source in up going route as claimed in claim 1, it is characterized in that, the residing network in the described sub-district of steps A is a narrowband systems, whether the base station is detected this sub-district and is existed the step of uplink interference to comprise, judge whether base station received signal intensity indication RSSI surpasses threshold value, if judge that then there is uplink interference in this sub-district; Otherwise, judge that there is not uplink interference in this sub-district.
9, the method for locating interference source in up going route as claimed in claim 1, it is characterized in that, the residing network in the described sub-district of steps A is a broadband system, whether the base station is detected this sub-district and is existed the step of uplink interference to comprise, judge that the base station receives main broadband internal power RTWP and whether surpasses threshold value, if judge that then there is uplink interference in this sub-district; Otherwise, judge that there is not uplink interference in this sub-district.
10, the method for locating interference source in up going route as claimed in claim 1 is characterized in that, further comprises after the described step C, preserves current beam direction angle.
11, the method for locating interference source in up going route as claimed in claim 1 is characterized in that, further comprises after the described steps A, before the step B, judges that this uplink interference is stationarity uplink interference, periodically uplink interference or randomness uplink interference.
12, the method for locating interference source in up going route as claimed in claim 1 is characterized in that, the number of the described adjacent area of step B is more than or equal to 2.
CNB2004101024813A 2004-12-23 2004-12-23 Method for locating interference source in up going route CN100361556C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010045784A1 (en) * 2008-10-20 2010-04-29 大唐移动通信设备有限公司 Method and device for determining mobile communication interference source

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015459A1 (en) * 2007-07-12 2009-01-14 STMicroelectronics N.V. Method for detecting the eventual presence of an interferer, for example a radar signal, adapted to interfere with a wireless device, for example an UWB device, and corresponding device.
CN101420716B (en) * 2007-10-23 2011-11-16 华为技术有限公司 Method, system and device for uplink interference source detection
CN101309494A (en) * 2008-06-30 2008-11-19 华为技术有限公司 Base station maintenance method, system and apparatus
WO2010063137A1 (en) 2008-12-01 2010-06-10 Telefonaktiebolaget L M Ericsson (Publ) Method of and apparatuses for recognizing an out-of-sync base station
CN101871978B (en) * 2009-04-23 2012-11-07 大唐移动通信设备有限公司 Method, system and device for determining position of interference source
CN102075982B (en) * 2009-11-23 2013-05-22 中国移动通信集团设计院有限公司 Method and device for determining interference source
CN102083103B (en) * 2009-11-27 2012-12-05 中国移动通信集团北京有限公司 Method and apparatus for determining positioning reference point in interference source positioning system
CN102215505B (en) * 2010-04-12 2015-09-16 中兴通讯股份有限公司 A kind of method and system detecting interference source in up going route
CN101873602B (en) * 2010-05-31 2013-04-17 新邮通信设备有限公司 Interference suppression method of physical upstream control channel (PUCCH) in LTE (Long Term Evolution) system
CN102186202A (en) * 2011-01-04 2011-09-14 京信通信系统(中国)有限公司 An interference source positioning system and method
CN102892137B (en) * 2011-07-21 2015-02-04 中国移动通信集团北京有限公司 Method and apparatus for locating interference source
CN103188704B (en) * 2011-12-29 2015-12-16 中国移动通信集团上海有限公司 A kind of analytical method of mobile communication system interference source, device and system
CN102655650B (en) * 2012-01-05 2015-05-06 电信科学技术研究院 Method and equipment for positioning far-end interference base station
CN103679681B (en) * 2012-09-06 2017-12-19 亿阳信通股份有限公司 A kind of analysis method and device of wireless network interference
CN106332271B (en) * 2015-06-30 2020-03-17 中国移动通信集团公司 Interference source positioning method and device
CN106842151B (en) * 2015-12-03 2019-11-26 中国航空工业集团公司雷华电子技术研究所 Based on the Passive Positioning test method that guinea pig system interference source azimuth angle is constant
CN105530703B (en) * 2016-01-28 2018-10-26 中国铁建电气化局集团北方工程有限公司 A kind of GSM-R interference source localization methods based on Mutual coupling value
CN107889049A (en) * 2016-09-30 2018-04-06 中国移动通信有限公司研究院 A kind of interference positioning method and positioner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1282496A (en) * 1997-12-19 2001-01-31 艾利森电话股份有限公司 System and method for improving handoffs in cellular mobile radio systems
WO2002033997A2 (en) * 2000-10-16 2002-04-25 Wireless Online, Inc. Method and system for calibrating antenna towers to reduce cell interference
CN1411188A (en) * 2001-10-10 2003-04-16 株式会社日立国际电气 Adaptive array aerial directivity controlling system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1282496A (en) * 1997-12-19 2001-01-31 艾利森电话股份有限公司 System and method for improving handoffs in cellular mobile radio systems
WO2002033997A2 (en) * 2000-10-16 2002-04-25 Wireless Online, Inc. Method and system for calibrating antenna towers to reduce cell interference
CN1411188A (en) * 2001-10-10 2003-04-16 株式会社日立国际电气 Adaptive array aerial directivity controlling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010045784A1 (en) * 2008-10-20 2010-04-29 大唐移动通信设备有限公司 Method and device for determining mobile communication interference source

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