CN101242222B - A device and method for detecting interference in uplink pilot channel - Google Patents
A device and method for detecting interference in uplink pilot channel Download PDFInfo
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- CN101242222B CN101242222B CN2008101018257A CN200810101825A CN101242222B CN 101242222 B CN101242222 B CN 101242222B CN 2008101018257 A CN2008101018257 A CN 2008101018257A CN 200810101825 A CN200810101825 A CN 200810101825A CN 101242222 B CN101242222 B CN 101242222B
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Abstract
The invention provides a device and method of detecting the interference on the uplink pilot channel for the TD-SCDMA systems. The device mainly comprises: a detection window extractor used to extract detection characteristics window; a correlator used to carry out linear related operation between the N downlink synchronous codes which interfere the base station and the detection window; a peak detector used to calculate the power value of each point of the N corresponding related sequences and find out the maximum power value, an accumulator used to add the N corresponding maximum power values so as to get the related power of the detection window; a maximum selector used to select the detection window of which the power value is the maximum; a threshold judgment used to compare the related power value of the detection window which has the maximum related power value with the preset threshold so as to determine the size of interference on the uplink pilot channel. According to the invention, the interference condition of the target base station can be detected accurately so as to adjust the sending position of SYNC-UL in time.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of apparatus and method that in TD-SCDMA (TD SDMA) system, detect the interference that receives on the UpPCH (ascending pilot channel).
Background technology
Along with the development of radio communication is popularized; Mobile communication subscriber quantity rapid growth, and frequency spectrum resource is limited, how to reduce interference; Maximally utilise frequency spectrum resource, making limited bandwidth can carry customer volume as much as possible is the problem that each network vendors is concerned about very much.
The TD-SCDMA system adopts TDD mode.Subframe structure in the TD-SCDMA system is as shown in Figure 1, and in this subframe structure, UpPCH is configured on TS1 (time slot 1, fixing as ascending time slot in the TD-SCDMA system) UpPTS (uplink pilot time slot) before.In the TD-SCDMA system, keep between the different base station synchronously, along with the increase of propagation distance; Between the base station; After TS0 of telepoint base station (time slot 0, fixing as descending time slot in the TD-SCDMA system) and DwPTS (descending pilot frequency time slot) arrive target BS through propagation delay, possibly produce the UpPTS of target BS and disturb; Be called from disturbing, disturb principle as shown in Figure 2 certainly.
Hypothetical target base station (interfered base station) is B0, and interference base station is B1, B2, and B3, interference base station is respectively t1 to the path time difference of target BS, t2, t3.The descending pilot frequency component gross power of launching when interference base station is bigger; And the time of descending interference pilot signal arrival target BS is when falling in ascending pilot frequency window detection time; Detection to ascending pilot frequency just possibly constitute interference, thereby influences the performance that ascending pilot frequency detects.In case target BS is interfered, can not receive UpPCH, then whole sub-district all might get clogged, thereby also can not insert at random in this sub-district perhaps and can not be used for switching as Target cell.And as far as being in all UE (subscriber terminal equipment) in this sub-district, this situation that whole sub-district all gets clogged is unacceptable.For fear of the generation of this situation, receive at UpPCH under the situation of larger interference, can let the terminal that SYNC-UL (uplink synchronous code) is transferred to other ascending time slot and send.
In the network environment of reality, because weather, the reason of weather, the communication environments of signal can change, and for a base station, its disturbed condition that receives can change in this case.On the other hand, if network environment changes, such as increasing a base station, it must to around other base stations impact, the disturbed condition that other base stations receive also will change.Therefore, detect the disturbed condition that target BS receives for accurate, thereby in time adjust the transmission position of SYNC-UL, be necessary that the disturbed condition that target BS is received carries out dynamic monitoring.
Summary of the invention
Technical problem to be solved by this invention provides a kind of apparatus and method that detect the interference that receives on the ascending pilot channel.
For solving the problems of the technologies described above, the present invention provides technical scheme following:
A kind of device that detects the interference that receives on the ascending pilot channel is used for the TD-SCDMA system, comprising:
The detection window extractor is used to extract the detected characteristics window, and it is moved with the step-length of setting in the scope of setting, and obtains a plurality of detection window, and said detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum;
Correlator is used for for each detection window, and the descending synchronous code of N interference base station is done the linear correlation computing with detection window respectively, obtains N correlated series;
Peak detector is used for for each detection window, calculates the performance number of each point in N the corresponding correlated series, finds out maximum power value wherein, obtains N power maximum;
Accumulator is used for for each detection window, and N power maximum of correspondence added up mutually, obtains the related power of detection window;
The maximum power selector is used to the detection window of selecting the related power value maximum;
Threshold judgement device, the related power value that is used for the detection window that said related power value is maximum and preset thresholding compare to confirm the size of the interference that receives on the ascending pilot channel.
Above-mentioned device wherein, also comprises scheduler module, is used to send Interference Detection and instructs the detection window extractor; Said detection window extractor is further used for after receiving said Interference Detection instruction, carrying out the operation of said extraction detected characteristics window again.
Above-mentioned device; Wherein, Said scheduler module also is used for when the threshold judgement device confirms that the interference that receives on the ascending pilot channel is big, and informing user terminal is transferred to the maximum detection window position of said related power value other ascending time slot afterwards with uplink synchronous code and sends.
Above-mentioned device; Wherein, said scheduler module is further used for when having user terminal to be in access state; Notify this user terminal that uplink synchronous code is transferred to other ascending time slot and send, and then send said Interference Detection and instruct said detection window extractor.
Above-mentioned device, wherein, said scheduler module is periodically sent said Interference Detection and is instructed said detection window extractor.
A kind of method that detects the interference that receives on the ascending pilot channel is used for the TD-SCDMA system, comprises the steps:
A, extraction detected characteristics window, and it is moved with the step-length of setting in the scope of setting, obtaining a plurality of detection window, said detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum;
B, for each detection window, the descending synchronous code of N interference base station is done the linear correlation computing with detection window respectively, obtain N correlated series;
C, for each detection window, calculate the performance number of each point in N the corresponding correlated series, find out maximum power value wherein, obtain N power maximum;
D, for each detection window, N power maximum of correspondence added up mutually, obtain the related power of detection window;
E, the maximum detection window of selection related power value;
The related power value of F, detection window that said related power value is maximum compares with preset thresholding, the size of the interference of confirming according to comparative result to receive on the ascending pilot channel.
Above-mentioned method wherein, also comprises before the said steps A, has judged whether that user terminal is in access state, if notify this user terminal that uplink synchronous code is transferred to other ascending time slot and send.
Above-mentioned method, wherein, said step F also comprises that when the interference that on confirming ascending pilot channel, receives was big, informing user terminal was transferred to the maximum detection window position of said related power value other ascending time slot afterwards with uplink synchronous code and sends afterwards.
According to the present invention, can accurately detect the disturbed condition that target BS receives, thereby in time adjust the transmission position of SYNC-UL.
Description of drawings
Fig. 1 is the subframe structure sketch map of TD-SCDMA system;
Fig. 2 is the interference principle schematic certainly of TD-SCDMA system;
Fig. 3 is the structural representation of the device of the interference that receives on the detection ascending pilot channel of the embodiment of the invention;
Fig. 4 is the concrete structure sketch map of descending pilot frequency time slot, protection time slot and the uplink pilot time slot of TD-SCDMA system;
Fig. 5 is the structural representation of detected characteristics window in the embodiment of the invention;
The sketch map that Fig. 6 moves for detected characteristics window in the embodiment of the invention;
Fig. 7 is the flow chart of the method for the interference that receives on the detection ascending pilot channel of the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.
Please with reference to Fig. 3, the device of the interference that receives on the detection ascending pilot channel of the embodiment of the invention mainly comprises: scheduler module 10, detection window extractor 20, correlator 30, peak detector 40, accumulator 50, maximum power selector 60 and threshold judgement device 70.This interference detecting apparatus is arranged in the base station of TD-SCDMA system.
Whether scheduler module 10 is at first judged in the residing sub-district of target BS has user terminal to be in access state; Need to send uplink synchronous code (SYNC-UL); If; Notify this user terminal that uplink synchronous code is transferred to other ascending time slot earlier and send, send Interference Detection then and instruct detection window extractor 20; Otherwise, directly send Interference Detection and instruct detection window extractor 20.What at this moment, target BS received at uplink pilot time slot is making an uproar at the end of the interference that caused by the descending synchronous code (SYNC-DL) that other base station (interference base station) sent and target BS receiver.
Wherein, this Interference Detection instruction can periodically be sent, and also can send as required, specifically confirms according to the actual conditions of network environment and system's setting.
In other embodiments of the invention; Scheduler module 10 has user terminal to be in access state in the residing sub-district of definite target BS; When needing to send uplink synchronous code; Also informing user terminal is not transferred to other ascending time slot transmission with uplink synchronous code, and this user terminal still sends SYNC-UL on UpPTS; Further, if user terminal is not received the network terminal feedback, can also continue to send, up to receiving network-feedback or reaching maximum number of times of transmission according to the regular hour retardation.
After detection window extractor 20 receives the Interference Detection instruction; At first extract the detected characteristics window; Detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum; The detected characteristics window is moved with the step-length of setting in the scope of setting, so obtain a plurality of detection window.
In the frame structure of TD-SCDMA system, the concrete structure of descending pilot frequency time slot, protection time slot (GP), uplink pilot time slot is as shown in Figure 4.Descending pilot frequency time slot is totally 96 chips, and wherein preceding 32 chips are the protection section, and back 64 chips are descending synchronous code; Descending pilot frequency time slot is the protection time slot of 96 chips at the back; After the protection time slot is uplink pilot time slot, and wherein preceding 128 chips are uplink synchronous code, and back 32 chips are the protection section.
The structure of the detected characteristics window that detection window extractor 20 is extracted is as shown in Figure 5.This detected characteristics window comprises the SYNC-UL of 128 chips, and the protection section GP1 and the GP2 of the right and left part, and the length of GP1 is l
GP1Chip, the length l of GP2
GP2Chip, the total length of detected characteristics window are (128+l
GP1+ l
GP2) chip.The length of GP1 and GP2 is confirmed general desirable l according to the area that the sub-district covers
GP1=l
GP2
The detected characteristics window moves in the scope of setting, and the scope of this setting can comprise TS1 and other ascending time slot, and its length L depends on concrete sub-district coverage condition; The step-length that moves is made as l
Step, its value choose the specific requirement of depending on operand and system.Detected characteristics window mobile as shown in Figure 6 so can obtain M=[L-(128+l
GP1+ l
GP2)]/l
Step+ 1 detection window.
Suppose to exist N interference base station, then for each detection window:
(1) by correlator 30 descending synchronous code (SYNC-DL) of a said N interference base station is done the linear correlation computing with this detection window respectively, obtain N correlated series c
1, c
2..., c
N
(2) then by the performance number of each point in the said N of the peak detector 40 calculating correlated series, find out maximum power value wherein, obtain N power maximum m
1, m
2..., m
N
(3) by accumulator 50 said N power maximum added up mutually again, obtain the related power of detection window
As previously mentioned; What target BS received at uplink pilot time slot is making an uproar at the end of the interference that caused by the descending synchronous code (SYNC-DL) that other base station (interference base station) sent and target BS receiver; If the interference that receives on the ascending pilot channel is very little, the detected related power of detection window should be very low so, otherwise; The existence if disturb, the detected related power of detection window is then higher.Therefore; If the related power value of the comparative result of threshold judgement device 70 detection window that to be the related power value maximum is greater than preset thresholding; Explain that then the interference that receives on the ascending pilot channel is bigger; At this moment, by scheduler module 10 informing user terminals uplink synchronous code (SYNC-UL) is transferred to other ascending time slot and sends, specifically sending the position is the maximum detection window position of said related power value other ascending time slot afterwards.
Corresponding to the interference detecting apparatus of the invention described above embodiment, the embodiment of the invention also provides a kind of interference detection method.
Please with reference to Fig. 7, the method for the interference that receives on the detection ascending pilot channel of the embodiment of the invention mainly comprises the steps:
The related power value of step 708, detection window that said related power value is maximum compares with preset thresholding, the size of the interference of confirming according to comparative result to receive on the ascending pilot channel;
In this step, if the related power value of the comparative result detection window that to be the related power value maximum explains then that greater than preset thresholding the interference that receives on the ascending pilot channel is bigger.
Should be noted that at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. a device that detects the interference that receives on the ascending pilot channel is used for TD SDMA TD-SCDMA system, it is characterized in that, comprising:
The detection window extractor is used to extract the detected characteristics window, and it is moved with the step-length of setting in the scope of setting, and obtains a plurality of detection window, and said detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum;
Correlator is used for for each detection window, and the descending synchronous code of N interference base station is done the linear correlation computing with detection window respectively, obtains N correlated series;
Peak detector is used for for each detection window, calculates the performance number of each point in N the corresponding correlated series, finds out maximum power value wherein, obtains N power maximum;
Accumulator is used for for each detection window, and N power maximum of correspondence added up mutually, obtains the related power of detection window;
The maximum power selector is used to the detection window of selecting the related power value maximum;
Threshold judgement device, the related power value that is used for the detection window that said related power value is maximum and preset thresholding compare to confirm the size of the interference that receives on the ascending pilot channel.
2. device as claimed in claim 1 is characterized in that, also comprises:
Scheduler module is used to send Interference Detection and instructs the detection window extractor;
Said detection window extractor is further used for after receiving said Interference Detection instruction, carrying out the operation of said extraction detected characteristics window again.
3. device as claimed in claim 2 is characterized in that:
Said scheduler module also is used for when the threshold judgement device confirms that the interference that receives on the ascending pilot channel is big, and informing user terminal is transferred to the maximum detection window position of said related power value other ascending time slot afterwards with uplink synchronous code and sends.
4. device as claimed in claim 2 is characterized in that:
Said scheduler module is further used for when having user terminal to be in access state, notifies this user terminal that uplink synchronous code is transferred to other ascending time slot and sends, and then send said Interference Detection and instruct said detection window extractor.
5. device as claimed in claim 2 is characterized in that:
Said scheduler module is periodically sent said Interference Detection and is instructed said detection window extractor.
6. a method that detects the interference that receives on the ascending pilot channel is used for the TD-SCDMA system, it is characterized in that, comprises the steps:
A, extraction detected characteristics window, and it is moved with the step-length of setting in the scope of setting, obtaining a plurality of detection window, said detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum;
B, for each detection window, the descending synchronous code of N interference base station is done the linear correlation computing with detection window respectively, obtain N correlated series;
C, for each detection window, calculate the performance number of each point in N the corresponding correlated series, find out maximum power value wherein, obtain N power maximum;
D, for each detection window, N power maximum of correspondence added up mutually, obtain the related power of detection window;
E, the maximum detection window of selection related power value;
The related power value of F, detection window that said related power value is maximum compares with preset thresholding, the size of the interference of confirming according to comparative result to receive on the ascending pilot channel.
7. method as claimed in claim 6 is characterized in that:
Also comprise before the said steps A, judged whether that user terminal is in access state, if notify this user terminal that uplink synchronous code is transferred to other ascending time slot and send.
8. method as claimed in claim 6 is characterized in that:
Said step F also comprises that when the interference that on confirming ascending pilot channel, receives was big, informing user terminal was transferred to the maximum detection window position of said related power value other ascending time slot afterwards with uplink synchronous code and sends afterwards.
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| CN2008101018257A CN101242222B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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| CN2008101018257A CN101242222B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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| CN101242222B true CN101242222B (en) | 2012-04-11 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101588192B (en) * | 2009-02-26 | 2013-03-13 | 北京天碁科技有限公司 | Method and device for confirming coarse synchronizing of downlink pilot |
| TWI487297B (en) * | 2009-06-24 | 2015-06-01 | Mstar Semiconductor Inc | Interference detector and method thereof |
| CN102209052B (en) * | 2010-03-31 | 2015-06-24 | 中兴通讯股份有限公司 | Method and device for carrying out frequency offset compensation on random access signals |
| CN102695193B (en) * | 2011-03-25 | 2015-12-02 | 中国移动通信集团公司 | A kind of subframe interference detection method, localization method and base station of intersecting |
| CN102457897A (en) * | 2011-10-21 | 2012-05-16 | 上海金陵表面贴装有限公司 | Method and device for detecting interference to uplink pilot channel of base station of time division-synchronization code division multiple access (TD-SCDMA) system |
| CN103701744B (en) * | 2012-09-27 | 2016-12-21 | 普天信息技术研究院有限公司 | A kind of interference detection method and device |
| CN105722111B (en) * | 2014-12-05 | 2019-05-31 | 中国移动通信集团公司 | A kind of interference detection method and device |
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| CN1933361A (en) * | 2006-10-18 | 2007-03-21 | 普天信息技术研究院 | Up inserting detection method |
| CN1988415A (en) * | 2005-12-21 | 2007-06-27 | 大唐移动通信设备有限公司 | Method for judging downward pilot frequency signal transmission mode in CDMA communication system |
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| CN1553740A (en) * | 2003-12-19 | 2004-12-08 | 北京天�科技有限公司 | Method and device for reducing sum of calculation for searching in zones and increasing accuracy of calculation |
| CN1988415A (en) * | 2005-12-21 | 2007-06-27 | 大唐移动通信设备有限公司 | Method for judging downward pilot frequency signal transmission mode in CDMA communication system |
| CN1863408A (en) * | 2006-06-12 | 2006-11-15 | 北京天碁科技有限公司 | Method and system for implementing common frequency measurement in TD-SCDMA system |
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