CN101242221B - 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 PDF

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Publication number
CN101242221B
CN101242221B CN2008101018242A CN200810101824A CN101242221B CN 101242221 B CN101242221 B CN 101242221B CN 2008101018242 A CN2008101018242 A CN 2008101018242A CN 200810101824 A CN200810101824 A CN 200810101824A CN 101242221 B CN101242221 B CN 101242221B
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detection window
uplink synchronous
synchronous code
interference
power
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CN101242221A (en
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马静
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Beijing T3G Technology Co Ltd
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Beijing T3G Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

A kind of apparatus and method that detect the interference that receives on the ascending pilot channel
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;
The detection window power calculator is used for for each detection window, calculates wherein uplink synchronous code section and the power of uplink synchronous code both sides partial protection section respectively, and the power that calculates uplink synchronous code both sides partial protection section with;
Divider is used for for each detection window, calculate said 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 said minimum power ratio and preset thresholding are compared 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 sends detection window position other ascending time slot afterwards that uplink synchronous code is transferred to said minimum power ratio.
Above-mentioned device, wherein, said scheduler module is further used for when having user terminal to be in access state, and the said Interference Detection of redispatching is instructed 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, 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, 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, calculate wherein uplink synchronous code section and the power of uplink synchronous code both sides partial protection section respectively, and the power that calculates uplink synchronous code both sides partial protection section with;
C, for each detection window, calculate said power and with the ratio of uplink synchronous code section power;
The detection window of D, selection minimum power ratio;
E, the power ratio and the preset thresholding of the detection window of said minimum power ratio compared the size of the interference of confirming according to comparative result to receive on the ascending pilot channel.
Above-mentioned method wherein, also comprises after the said step e, and when the interference that on confirming ascending pilot channel, receives was big, informing user terminal sent detection window position other ascending time slot afterwards that uplink synchronous code is transferred to said minimum power ratio.
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, 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 be sent, and also can send as required, specifically confirms 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 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.
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 partial protection section GP1, P GP2, and the power and the P of calculating uplink synchronous code both sides partial protection 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 following:
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.
Threshold judgement device 60 is used for the power ratio of the detection window of said minimum power ratio and preset thresholding are compared to confirm the size of the interference that receives on the ascending pilot channel.
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 beappreciated from fig. 4, all there is the protection section on the uplink synchronous code both sides, if the interference that receives 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 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 detection window position other ascending time slot afterwards of said 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 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:
Step 701, 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, said detected characteristics window length is uplink synchronous code length and uplink synchronous code both sides partial protection segment length sum;
Step 702, for each detection window, calculate wherein uplink synchronous code section and the power of uplink synchronous code both sides partial protection section respectively, and the power that calculates uplink synchronous code both sides partial protection section with;
Step 703, for each detection window, calculate said power and with the ratio of uplink synchronous code section power;
The detection window of step 704, selection minimum power ratio;
Step 705, the power ratio and the preset thresholding of the detection window of said minimum power ratio compared the size of the interference of confirming according to comparative result to receive on the ascending pilot channel;
In this step, if comparative result be the power ratio of detection window of minimum power ratio greater than preset thresholding, explain that then the interference that receives on the ascending pilot channel is bigger.
Step 706, when the interference that on confirming ascending pilot channel, receives is big, other ascending time slot that informing user terminal is transferred to uplink synchronous code after the detection window position of said minimum power ratio sends.
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 (5)

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:
Scheduler module is used for when having user terminal to be in access state, sends Interference Detection and instructs the detection window extractor;
The detection window extractor; Be used for when receiving the Interference Detection instruction, extracting the detected characteristics window, and it is moved with the step-length of setting in the scope of setting; Obtain 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;
The detection window power calculator is used for for each detection window, calculates wherein uplink synchronous code section and the power of uplink synchronous code both sides partial protection section respectively, and the power that calculates uplink synchronous code both sides partial protection section with;
Divider is used for for each detection window, calculate said 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 said minimum power ratio and preset thresholding are compared 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:
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 sends detection window position other ascending time slot afterwards that uplink synchronous code is transferred to said minimum power ratio.
3. device as claimed in claim 1 is characterized in that:
Said scheduler module is periodically sent said Interference Detection and is instructed said detection window extractor.
4. 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, 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, 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, calculate wherein uplink synchronous code section and the power of uplink synchronous code both sides partial protection section respectively, and the power that calculates uplink synchronous code both sides partial protection section with;
C, for each detection window, calculate said power and with the ratio of uplink synchronous code section power;
The detection window of D, selection minimum power ratio;
E, the power ratio and the preset thresholding of the detection window of said minimum power ratio compared the size of the interference of confirming according to comparative result to receive on the ascending pilot channel.
5. method as claimed in claim 4 is characterized in that:
Comprise also after the said step e that when the interference that on confirming ascending pilot channel, receives was big, informing user terminal sent detection window position other ascending time slot afterwards that uplink synchronous code is transferred to said minimum power ratio.
CN2008101018242A 2008-03-12 2008-03-12 A device and method for detecting interference in uplink pilot channel Expired - Fee Related CN101242221B (en)

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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
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
US20150043370A1 (en) * 2012-03-28 2015-02-12 Nokia Inter-Cell Interference Detection for Inter Portable Long Term Evolution Local Area Network Interference
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
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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