CN109660935B - Interference positioning method for base station side array antenna system - Google Patents

Interference positioning method for base station side array antenna system Download PDF

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CN109660935B
CN109660935B CN201811428477.4A CN201811428477A CN109660935B CN 109660935 B CN109660935 B CN 109660935B CN 201811428477 A CN201811428477 A CN 201811428477A CN 109660935 B CN109660935 B CN 109660935B
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interference
base station
user
power
path loss
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CN109660935A (en
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曹娟
张艳秋
冯伟
王珏
孙强
杨永杰
葛宁
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Nantong Research Institute for Advanced Communication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H04B17/327—Received signal code power [RSCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • 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

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Abstract

The invention discloses an interference positioning method of a base station side array antenna system, which comprises the steps of closing data transmission of a base station and a user at regular time, receiving interference information, determining the interference direction of the base station side by a DOA (direction of arrival) method, reporting the received interference power to the base station by the user, judging and calculating an interference position area and power jointly according to the interference information received by the base station and the user, effectively positioning the interference position area, adding no additional test equipment, manually checking, saving manpower and material resources, and effectively positioning the interference position area and the transmission power; the method for positioning the interference position has low algorithm complexity and is suitable for a communication system of the array antenna at the base station side.

Description

Interference positioning method for base station side array antenna system
Technical Field
The invention relates to the field of communication, in particular to an interference positioning method of a base station side array antenna system.
Background
The shared nature of the wireless channel makes wireless networks vulnerable to intra-network self-interference or inter-system interference. In order to effectively cope with interference attacks, researchers at home and abroad propose interference elimination or avoidance methods including channel level, link level and network level from the aspects of physical layer communication modes, link layer scheduling strategies, network layer routing algorithms, application layer service quality adjustment and the like. By contrast, it is less studied how to effectively locate the source of interference to eliminate the interference threat from the source. At present, a common interference source positioning method is a manual station-entering interference checking method. The method is that a directional antenna (yagi antenna, log periodic antenna, flat directional antenna, etc.) is usually used to measure the signal direction, and a high-performance spectrum detection device is equipped to observe the wave shape of the detected signal, so that once the phenomenon that the duration of the interference signal is long occurs, a tester rotates the antenna and orients at the measurement place. By measuring the interference signal at several locations using directional antennas, the location of the interference source can be roughly determined. The manual checking method has the following defects that (1) the measuring steps are complicated, and the efficiency is low; (2) the number of base stations built in the common site is large, and the checking engineering quantity is large; (3) the measurement signal is a time-varying signal, which is affected by accidental conditions, and the result has errors.
Disclosure of Invention
The invention aims to provide an interference positioning method of a base station side array antenna system with small error and high efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: an interference positioning method of a base station side array antenna system is characterized by comprising the following steps:
step 1, reporting position information by a user;
step 2, the base station and the user stop sending the information at regular time and only receive the interference information;
step 3, the base station judges the direction of the interference signal by a DOA method;
step 4, the user reports the received interference power;
step 5, if users with interference power not larger than that of the base station exist, one user is randomly selected, and the step 6 is carried out, otherwise, users with interference power larger than that of the base station are randomly selected, and the step 7 is carried out;
step 6, according to the interference power received by the base station, the user interference power selected in the step 5, the path loss model and the interference direction estimated by the base station, jointly calculating and determining an interference position, outputting a region for determining the interference position, and entering a step 8 after the calculation is finished;
step 7, the interference power of the selected user is larger than the interference power of the base station;
and 8, calculating interference transmitting power according to the interference position, the interference receiving power and the path loss model.
Further, the step 7 further includes the following steps:
7a, estimating interference directions according to the interference power received by the base station, the user interference power selected in the step 5, a path loss model and the base station, and calculating interference positions in a combined manner, wherein the number of the interference position area calculation results is two;
and 7b, selecting one user from the unselected users, verifying the two interference position areas obtained by calculation in the step 7a according to the received power and the path loss model, outputting and determining the interference position area, and if the two areas are verified correctly, re-selecting two other users for verification.
Compared with the prior art, the invention has the beneficial effects that: manual investigation is not needed, manpower and material resources are saved, and the interference position area and the transmitting power can be effectively positioned; the method for positioning the interference position has low algorithm complexity and is suitable for a communication system of the array antenna at the base station side.
Drawings
Fig. 1 is a schematic diagram of a situation where interference is close to a user;
FIG. 2 is a diagram illustrating a situation where interference is closer to a base station;
FIG. 3 is a model diagram of the situation shown in FIG. 1;
FIG. 4 is a model diagram of the situation represented by bit map 2;
FIG. 5 is a schematic flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present embodiment discloses an interference positioning method for a base station side array antenna system, where the interference system model is shown in fig. 1 and 2, where fig. 1 is a case where interference is closer to a user, and fig. 2 is a case where interference is closer to a base station. Assuming that the base station side is an array antenna, the base station and the user stop data transmission at regular time and perform interference reception. And the user reports the received interference information to the base station, and the interference is positioned by processing the received interference. The whole system consists of a module 101, a module 102, a module 103 and a module 104, wherein the module 101 is an array antenna base station and is mainly used for receiving interference and estimating the interference direction; the module 102 is a user terminal, and generally refers to a device for receiving and transmitting data by a user, such as a mobile phone, a notebook, etc.; the module 103 is interference, namely, the positioning part required by the scheme; module 104 is a wireless communication link that primarily functions to transmit wireless signals. Fig. 3 and 4 are mathematical models corresponding to fig. 1 and 2, respectively.
As shown in fig. 5, a flowchart of an interference positioning method for a base station side array antenna system specifically includes the following steps:
step 1, reporting position information by a user;
step 2, the base station and the user stop sending the information at regular time, only receiving the interference information, and the base station receiving interference power is PBThe received interference power of user m is Pm；
Step 3, the base station estimates the direction of the interference signal by a DOA method, as shown by BI rays in figures 3 and 4;
step 4, the user reports the power of the received interference;
step 5, if there is a user with interference power not greater than that of the base station, that is, there is a user m, so as to receive interference power Pm≤PBThen randomly choose one such user and proceed toEntering step 6, otherwise, randomly selecting a user m with interference power larger than that of the base station, and entering step 7;
step 6, establishing a coordinate system by using a plane where the base station and the user are located, wherein the position of the user m is a point UmThe location of the base station is point B, as shown in fig. 3. According to the base station received interference power PBStep 5, the interference power P of the selected user mmThe path loss model and the base station estimate the interference direction, and jointly calculate and determine the interference position, wherein the specific process comprises the following steps:
selecting different path loss models according to different environments, wherein a Hata-Okumura model is selected, and then:
PT-Pm＝69.55+26.16lgf-13.82lght－α(hm)+(44.9-6.55lght)*lgdm (1)
PT-PB＝69.55+26.16lgf-13.82lght－α(hB)+(44.9-6.55lght)*lgdB (2)
wherein P isTTransmitting power for the interference;
f is the interference signal frequency;
ht is the effective height (m) of the interference antenna;
hm is the effective height (m) of the user antenna;
dBdistance (km) between interference and base station;
alpha is a receiving antenna height factor;
(1) the formula is reduced by the formula (2) to obtain:
Figure BDA0001882171000000041
substituting ht-30 m and ht-200 m into the above equations, respectively, can obtain a value of a ratio λ between a user-to-interference distance and a base station-to-interference distance when the interference height is between 30 and 200m, and:
Figure BDA0001882171000000042
when the lambda is 1, according to mathematical knowledge, the interference is located on a user and a base station perpendicular line, the intersection point of the interference and the ray BI is the position of the interference, and the interference position can be uniquely determined at the moment;
when lambda is larger than 1, the locus of a point with constant distance ratio to two fixed points is a circle and the locus circle is positioned on the right side according to mathematical knowledge, as shown in fig. 3, the two circles respectively represent the situation that the interference height is at two extreme values, the position of the interference is a shadow part area between the intersection point of the ray BI and the two circles, and at this time, the interference position area can be uniquely determined;
after the calculation is finished, entering step 8;
step 7, if the interference power of the selected user is larger than that of the base station, the interference power of the selected user needs to be divided into the following two steps
7a, establishing a coordinate system by using a plane where the base station and the user are located, and locating the user m at a point UmThe base station is located at point B as shown in fig. 4. And (5) estimating an interference direction according to the interference power received by the base station, the user interference power selected in the step 5, the path loss model and the base station, and jointly calculating an interference position.
In this case, as in step 6, a ratio λ between the user-to-interference distance and the base station-to-interference distance is obtained according to the path loss model, and:
Figure BDA0001882171000000051
from mathematical knowledge, the locus of points with a constant distance ratio to two fixed points is a circle, and when λ < 1, the locus circle is located on the left side, as shown in fig. 4. The two circles respectively represent the situation that the interference height is at two extreme values, the position of the interference is a shadow part area between the ray BI and the intersection point of the two circles, and since the two areas are at the same side of the base station, the error interference cannot be eliminated, and further verification is needed at the moment;
and 7b, selecting a user n from the unselected users, and verifying the two interference position areas obtained by calculation in the step 7a according to the received power and the path loss model so as to determine a correct interference position area. If the two areas in the step 7a are correct, the two users are symmetrical about the interference connection line of the base station, and the step 7b needs to be executed again;
and 8, estimating the interference transmitting power according to the interference position, the interference receiving power and the path loss model.
The invention can automatically position or manually operate through the system, thereby saving manpower and material resources without manual investigation, and can effectively position the interference position area and the transmitting power aiming at the system taking the base station side as the array antenna; the interference position is positioned by combining the interference information received by the base station and the interference information received by the user terminal, the algorithm complexity is low, the method is suitable for a communication system of the array antenna at the base station side, and no additional test equipment is needed.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims (2)

1. An interference positioning method of a base station side array antenna system is characterized by comprising the following steps:
step 1, reporting position information by a user;
step 2, the base station and the user stop sending the information at regular time and only receive the interference information;
step 3, the base station judges the direction of the interference signal by a DOA method;
step 4, the user reports the received interference power;
step 5, if users with interference power not larger than that of the base station exist, one user is randomly selected, and the step 6 is carried out, otherwise, users with interference power larger than that of the base station are randomly selected, and the step 7 is carried out;
step 6, according to the interference power received by the base station, the user interference power selected in the step 5, the path loss model and the interference direction judged by the base station, jointly calculating and determining the interference position, and outputting a region for determining the interference position, the specific process is as follows:
selecting different path loss models according to different environments, wherein a Hata-Okumura model is selected, and then:
PT-Pm＝69.55+26.16lgf-13.82lght－α(hm)+(44.9-6.55lght)*lgdm (1)
PT-PB＝69.55+26.16lgf-13.82lght－α(hB)+(44.9-6.55lght)*lgdB (2)
wherein P isTTransmitting power for the interference;
f is the interference signal frequency;
ht is the effective height (m) of the interference antenna;
hm is the effective height (m) of the user antenna;
dBdistance (km) between interference and base station;
alpha is a receiving antenna height factor;
(1) the formula is reduced by the formula (2) to obtain:
Figure FDA0002744867260000011
substituting ht-30 m and ht-200 m into the above equations, respectively, can obtain a value of a ratio λ between a user-to-interference distance and a base station-to-interference distance when the interference height is between 30 and 200m, and:
Figure FDA0002744867260000021
when the lambda is 1, according to mathematical knowledge, the interference is located on a user and a base station perpendicular line, the intersection point of the interference and the ray BI is the position of the interference, and the interference position can be uniquely determined at the moment;
when lambda is larger than 1, the locus of a point with constant distance ratio to two fixed points is a circle and is positioned on the right side according to mathematical knowledge, the two circles respectively represent the situation that the interference height is at two limit values, the position of the interference is a shadow part area between the intersection point of a ray BI and the two circles, and at the moment, the interference position area can be uniquely determined; after the calculation is finished, entering step 8;
step 7, selecting the interference power of the user to be larger than the interference power of the base station;
and 8, calculating interference transmitting power according to the interference position, the interference receiving power and the path loss model.
2. The method as claimed in claim 1, wherein the step 7 further comprises the steps of:
7a, estimating interference directions according to the interference power received by the base station, the user interference power selected in the step 5, a path loss model and the base station, and calculating interference positions in a combined manner, wherein the number of the interference position area calculation results is two;
and 7b, selecting one user from the unselected users, verifying the two interference position areas obtained by calculation in the step 7a according to the received power and the path loss model, outputting and determining the interference position area, and if the two areas are verified correctly, re-selecting two other users for verification.
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