CN101242221A - 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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- CN101242221A CN101242221A CNA2008101018242A CN200810101824A CN101242221A CN 101242221 A CN101242221 A CN 101242221A CN A2008101018242 A CNA2008101018242 A CN A2008101018242A CN 200810101824 A CN200810101824 A CN 200810101824A CN 101242221 A CN101242221 A CN 101242221A
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Abstract
The invention provides a device and a method which are used to detect subjected interference of uplink pilot channels in TD-SCDMA system. The device mainly comprises: a detection window extraction, is used to extract and detect feature windows; a detection window power calculator is used to calculate uplink synchronous codes and power of both sides of uplink synchronous codes protection segment, and calculate power sum of both sides of uplink synchronous codes protection segment; a divider, is used to for each detection window, calculate the ratio of the power and uplink synchronous code segment power; a smallest power ratio selector, is used to select the smallest power ratio detection window; a Threshold judgment device, is used to compare the smallest power ratio detection window power ratio with presupposition threshold to determine the size of the subjected interference of uplink pilot channels. 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 for for each detection window, calculate respectively wherein the uplink synchronous code section and the power of uplink synchronous code both sides part protection section, and calculate uplink synchronous code both sides part protection section power and;
Divider is used for for each detection window, calculate described power and with the ratio of uplink synchronous code section power;
Minimum power is used to select the detection window of minimum power ratio than value selector;
The threshold judgement device is used for the power ratio of the detection window of described minimum power ratio 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 minimum power ratio.
Above-mentioned device, wherein, described scheduler module is further used for when having user terminal to be in access state, sends described Interference Detection again and instructs 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, comprises the steps:
A, when having user terminal to be in access state, extract the detected characteristics window, and it is moved with the step-length of setting in the scope of setting, and 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, for each detection window, calculate respectively wherein the uplink synchronous code section and the power of uplink synchronous code both sides part protection section, and calculate uplink synchronous code both sides part protection section power and;
C, for each detection window, calculate described power and with the ratio of uplink synchronous code section power;
The detection window of D, selection minimum power ratio;
E, the power ratio of the detection window of described minimum power ratio 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 after the described step e, 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 minimum power ratio.
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, divider 40, minimum power are than value selector 50 and threshold judgement device 60.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 then send Interference Detection and instruct detection window extractor 20.At this moment, what target BS received at uplink pilot time slot is the uplink synchronous code that user terminal sends, and the making an uproar at the end of the interference that causes of the descending time slot signal of being sent by other base station (interference base station) 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.
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.
For each detection window:
(1) calculates the power P of uplink synchronous code section wherein respectively by detection window power calculator 30
SYNC_ULAnd the power P of uplink synchronous code both sides part protection section
GP1, P
GP2, and calculate power and the P that uplink synchronous code both sides part is protected section
GP=P
GP1+ P
GP2
(2) then by divider 40 calculate protection section power and with the ratio of uplink synchronous code section power, equation expression is as follows:
R
i＝(P
GP1+P
GP2)/P
SYNC_UL，i＝1，...，M
Minimum power is therefrom selected the detection window of minimum power ratio than the result of calculation of value selector 50 according to divider 40.
As previously mentioned, what target BS received at uplink pilot time slot is the uplink synchronous code that user terminal sends, and the making an uproar at the end of the interference that causes of the descending time slot signal of being sent by other base station (interference base station) and target BS receiver.As can be seen from Figure 4, all there is the protection section on the uplink synchronous code both sides, if the interference that is subjected to is very little, the detected power ratio of detection window should be very low so, otherwise if disturb existence, the detected power ratio of detection window is then higher.Therefore, if the comparative result of threshold judgement device 60 is that the power ratio of detection window of minimum power ratio 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 minimum power ratio.
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 704, selection minimum power ratio;
In this step, if comparative result be the power ratio of detection window of minimum power ratio 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 (7)
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 for for each detection window, calculate respectively wherein the uplink synchronous code section and the power of uplink synchronous code both sides part protection section, and calculate uplink synchronous code both sides part protection section power and;
Divider is used for for each detection window, calculate described power and with the ratio of uplink synchronous code section power;
Minimum power is used to select the detection window of minimum power ratio than value selector;
The threshold judgement device is used for the power ratio of the detection window of described minimum power ratio 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 minimum power ratio.
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, sends described Interference Detection again and instructs 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, when having user terminal to be in access state, extract the detected characteristics window, and it is moved with the step-length of setting in the scope of setting, and 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, for each detection window, calculate respectively wherein the uplink synchronous code section and the power of uplink synchronous code both sides part protection section, and calculate uplink synchronous code both sides part protection section power and;
C, for each detection window, calculate described power and with the ratio of uplink synchronous code section power;
The detection window of D, selection minimum power ratio;
E, the power ratio of the detection window of described minimum power ratio 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:
Comprise also after the described step e 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 minimum power ratio on determining ascending pilot channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101018242A CN101242221B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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| CN2008101018242A CN101242221B (en) | 2008-03-12 | 2008-03-12 | A device and method for detecting interference in uplink pilot channel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011015152A1 (en) * | 2009-08-06 | 2011-02-10 | 大唐移动通信设备有限公司 | Method, system and device for reporting uplink pilot interference |
| 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 |
| WO2013143088A1 (en) * | 2012-03-28 | 2013-10-03 | Nokia Corporation | Inter-cell interference detection for inter portable long term evolution local area network interference |
| WO2014173352A1 (en) * | 2013-09-04 | 2014-10-30 | 中兴通讯股份有限公司 | Position determination method and device, and computer storage medium |
| CN105828349A (en) * | 2015-01-04 | 2016-08-03 | 中国移动通信集团公司 | Far-end interference detection method and far-end interference detection device based on TD-LTE system |
| CN113055104A (en) * | 2021-03-09 | 2021-06-29 | 上海移远通信技术股份有限公司 | Signal detection method and system based on channel scanning |
-
2008
- 2008-03-12 CN CN2008101018242A patent/CN101242221B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011015152A1 (en) * | 2009-08-06 | 2011-02-10 | 大唐移动通信设备有限公司 | Method, system and device for reporting uplink pilot interference |
| CN101990217A (en) * | 2009-08-06 | 2011-03-23 | 大唐移动通信设备有限公司 | Method, system and device for sending uplink pilot time slot interference |
| CN101990217B (en) * | 2009-08-06 | 2013-03-27 | 电信科学技术研究院 | Method, system and device for sending uplink pilot time slot interference |
| US10117262B2 (en) | 2009-08-06 | 2018-10-30 | China Academy Of Telecommunications Technology | Method, system and device for reporting uplink pilot interference |
| 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 |
| CN104221419A (en) * | 2012-03-28 | 2014-12-17 | 诺基亚公司 | Inter-cell interference detection for inter portable long term evolution local area network interference |
| WO2013143088A1 (en) * | 2012-03-28 | 2013-10-03 | Nokia Corporation | Inter-cell interference detection for inter portable long term evolution local area network interference |
| WO2014173352A1 (en) * | 2013-09-04 | 2014-10-30 | 中兴通讯股份有限公司 | Position determination method and device, and computer storage medium |
| CN104427614A (en) * | 2013-09-04 | 2015-03-18 | 中兴通讯股份有限公司 | Position determination method and device |
| US9930630B2 (en) | 2013-09-04 | 2018-03-27 | Sanechips Technology Co., Ltd. | Position determination method and device, and computer storage medium |
| CN104427614B (en) * | 2013-09-04 | 2019-03-22 | 中兴通讯股份有限公司 | A kind of location determining method and device |
| CN105828349A (en) * | 2015-01-04 | 2016-08-03 | 中国移动通信集团公司 | Far-end interference detection method and far-end interference detection device based on TD-LTE system |
| CN105828349B (en) * | 2015-01-04 | 2019-04-23 | 中国移动通信集团公司 | A kind of far-end interference detection method and device based on TD-LTE system |
| CN113055104A (en) * | 2021-03-09 | 2021-06-29 | 上海移远通信技术股份有限公司 | Signal detection method and system based on channel scanning |
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| CN101242221B (en) | 2012-03-21 |
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