CN101242223A - 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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- CN101242223A CN101242223A CNA2008101018280A CN200810101828A CN101242223A CN 101242223 A CN101242223 A CN 101242223A CN A2008101018280 A CNA2008101018280 A CN A2008101018280A CN 200810101828 A CN200810101828 A CN 200810101828A CN 101242223 A CN101242223 A CN 101242223A
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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 main comprises: a detection window extractor used to extract detection characteristics window and gets a plurality of detection windows through shifting itself in a preset range according to a preset step length, and the length of the detection characteristics window is the sum of the length of the uplink synchronous code and the length of the two-side protection sections of the uplink synchronous code; a detection window power calculator used to calculate the power of each 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 is subjected 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 as shown in Figure 1, 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, increase along with 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, may produce the UpPTS of target BS and disturb, be called self-interference, the self-interference principle as shown in Figure 2.
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 may 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 or can not be used for switching as Target cell.And for 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, be subjected at UpPCH under the situation of larger interference, can allow 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 is subjected to 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 are subjected to also will change.Therefore, detect the disturbed condition that target BS is subjected to for accurate, thereby in time adjust the transmission position of SYNC-UL, be necessary that the disturbed condition that target BS is subjected to 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 is subjected on the ascending pilot channel.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of device that detects the interference that is subjected 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 described detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides part protection segment length sum;
The detection window power calculator is used to calculate the power of each detection window;
The maximum power selector is used to select the detection window of performance number maximum;
The threshold judgement device is used for the performance number of the detection window of described performance number maximum and default thresholding are compared to determine the size of the interference that is subjected 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; Described detection window extractor is further used for carrying out the operation of described extraction detected characteristics window again after receiving described Interference Detection instruction.
Above-mentioned device, wherein, described scheduler module also is used for when the threshold judgement device determines that the interference that is subjected on the ascending pilot channel is big, and informing user terminal sends detection window position other ascending time slot afterwards that uplink synchronous code is transferred to described performance number maximum.
Above-mentioned device, wherein, described 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 described Interference Detection and instruct described detection window extractor.
Above-mentioned device, wherein, described scheduler module periodically sends described Interference Detection and instructs described detection window extractor.
A kind of method that detects the interference that is subjected 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, described detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides part protection segment length sum;
B, calculate the power of each detection window;
The detection window of C, selection performance number maximum;
D, the performance number of the detection window of described performance number maximum and default thresholding are compared, determine the size of the interference that is subjected on the ascending pilot channel according to comparative result.
Above-mentioned method wherein, also comprises before the described 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, also comprises after the described step D, and when the interference that is subjected on determining ascending pilot channel was big, informing user terminal sent detection window position other ascending time slot afterwards that uplink synchronous code is transferred to described performance number maximum.
According to the present invention, can accurately detect the disturbed condition that target BS is subjected to, thereby in time adjust the transmission position of SYNC-UL.
Description of drawings
Fig. 1 is the subframe structure schematic diagram of TD-SCDMA system;
Fig. 2 is the self-interference principle schematic of TD-SCDMA system;
Fig. 3 is the structural representation of the device of the interference that is subjected on the detection ascending pilot channel of the embodiment of the invention;
Fig. 4 is the concrete structure schematic diagram 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 schematic diagram 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 is subjected on the detection ascending pilot channel of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Please refer to Fig. 3, the device of the interference that is subjected on the detection ascending pilot channel of the embodiment of the invention mainly comprises: scheduler module 10, detection window extractor 20, detection window power calculator 30, maximum power selector 40 and threshold judgement device 50.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 time slot signal that other base station (interference base station) sent and target BS receiver.
Wherein, this Interference Detection instruction can periodically send, and also can send as required, specifically determines 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 according to the regular hour retardation, up to receiving network-feedback or reaching maximum number of times of transmission.In this case, be intermittently because terminal sends SYNC-DL, network terminal can be carried out Interference Detection in the free time section that does not have SYNC-UL to send.
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 part 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 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; The descending pilot frequency time slot back is the protection time slot of 96 chips; 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 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 determined 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.Moving as shown in Figure 6 of detected characteristics window so can obtain M=[L-(128+l
GP1+ l
GP2)]/l
Step+ 1 detection window.
Detection window power calculator 30 calculates the power of each detection window, obtains M performance number.For each detection window, its power calculation is as follows:
Wherein, x
jBe the complex data of j chip receiving in the detection window, P
iBe the power of i detection window, i=1 ..., M.
Maximum power selector 40 is therefrom selected the detection window of performance number maximum according to the result of calculation of detection window power calculator 30.
Threshold judgement device 50 is used for the performance number of the detection window of described performance number maximum and default thresholding are compared to determine the size of the interference that is subjected on the ascending pilot channel.
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 time slot signal that other base station (interference base station) sent and target BS receiver, if the interference that is subjected on the ascending pilot channel is very little, the detected power of detection window should be very low so, otherwise, the existence if disturb, the detected power of detection window is then higher.Therefore, if the comparative result of threshold judgement device 50 is that the performance number of detection window of performance number maximum is greater than default thresholding, illustrate that then the interference that is subjected 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 detection window position other ascending time slot afterwards of described performance number maximum.
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 refer to Fig. 7, the method for the interference that is subjected on the detection ascending pilot channel of the embodiment of the invention mainly comprises the steps:
The detection window of step 705, selection performance number maximum;
In this step, if comparative result be the performance number of detection window of performance number maximum greater than default thresholding, illustrate that then the interference that is subjected 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 breaking away from the spiritual scope of technical solution 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 is subjected 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 described detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides part protection segment length sum;
The detection window power calculator is used to calculate the power of each detection window;
The maximum power selector is used to select the detection window of performance number maximum;
The threshold judgement device is used for the performance number of the detection window of described performance number maximum and default thresholding are compared to determine the size of the interference that is subjected 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;
Described detection window extractor is further used for carrying out the operation of described extraction detected characteristics window again after receiving described Interference Detection instruction.
3. device as claimed in claim 2 is characterized in that:
Described scheduler module also is used for when the threshold judgement device determines that the interference that is subjected on the ascending pilot channel is big, and informing user terminal sends detection window position other ascending time slot afterwards that uplink synchronous code is transferred to described performance number maximum.
4. device as claimed in claim 2 is characterized in that:
Described 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 described Interference Detection and instruct described detection window extractor.
5. device as claimed in claim 2 is characterized in that:
Described scheduler module periodically sends described Interference Detection and instructs described detection window extractor.
6. a method that detects the interference that is subjected 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, described detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides part protection segment length sum;
B, calculate the power of each detection window;
The detection window of C, selection performance number maximum;
D, the performance number of the detection window of described performance number maximum and default thresholding are compared, determine the size of the interference that is subjected on the ascending pilot channel according to comparative result.
7. method as claimed in claim 6 is characterized in that:
Also comprise before the described 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:
Comprise also after the described step D that when the interference that is subjected to was big, informing user terminal sent detection window position other ascending time slot afterwards that uplink synchronous code is transferred to described performance number maximum on determining ascending pilot channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101018280A CN101242223B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101018280A CN101242223B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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| CN101242223B CN101242223B (en) | 2012-03-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009132534A1 (en) * | 2008-04-30 | 2009-11-05 | 中国移动通信集团广东有限公司 | Method and apparatus for transferring information, method and apparatus for configuring uppch |
| 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 |
| CN102655652A (en) * | 2012-01-05 | 2012-09-05 | 电信科学技术研究院 | Method and equipment for detecting far-end interference |
| CN103581957A (en) * | 2012-07-25 | 2014-02-12 | 中国移动通信集团公司 | Interference detection method, device and system |
| CN104581836A (en) * | 2013-10-29 | 2015-04-29 | 中兴通讯股份有限公司 | Method and equipment for improving DME interference resisting capability of LTE system |
| CN104780550A (en) * | 2014-01-10 | 2015-07-15 | 中国移动通信集团公司 | Interference detection method, base station and interference detection system |
| CN102045738B (en) * | 2009-10-19 | 2015-10-21 | 中兴通讯股份有限公司 | Interference detection method and device |
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2008
- 2008-03-12 CN CN2008101018280A patent/CN101242223B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009132534A1 (en) * | 2008-04-30 | 2009-11-05 | 中国移动通信集团广东有限公司 | Method and apparatus for transferring information, method and apparatus for configuring uppch |
| CN102045738B (en) * | 2009-10-19 | 2015-10-21 | 中兴通讯股份有限公司 | Interference detection method and device |
| 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 |
| CN102655652A (en) * | 2012-01-05 | 2012-09-05 | 电信科学技术研究院 | Method and equipment for detecting far-end interference |
| CN102655652B (en) * | 2012-01-05 | 2015-05-20 | 电信科学技术研究院 | Method and equipment for detecting far-end interference |
| CN103581957A (en) * | 2012-07-25 | 2014-02-12 | 中国移动通信集团公司 | Interference detection method, device and system |
| CN103581957B (en) * | 2012-07-25 | 2016-08-10 | 中国移动通信集团公司 | A kind of interference detection method, equipment and system |
| CN104581836A (en) * | 2013-10-29 | 2015-04-29 | 中兴通讯股份有限公司 | Method and equipment for improving DME interference resisting capability of LTE system |
| CN104581836B (en) * | 2013-10-29 | 2020-04-28 | 中兴通讯股份有限公司 | Method and equipment for improving anti-range finder interference capability of LTE (Long term evolution) system |
| CN104780550A (en) * | 2014-01-10 | 2015-07-15 | 中国移动通信集团公司 | Interference detection method, base station and interference detection system |
| CN104780550B (en) * | 2014-01-10 | 2018-06-12 | 中国移动通信集团公司 | A kind of interference detection method, base station and system |
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|---|---|
| CN101242223B (en) | 2012-03-28 |
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