CN114095111A - Co-channel interference suppression method based on position information and communication terminal - Google Patents
Co-channel interference suppression method based on position information and communication terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/59—Responders; Transponders
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
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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
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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
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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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
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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Abstract
本发明公开了一种基于位置信息的同频干扰抑制方法，包括如下步骤：S1：根据全线场强覆盖测试数据、服务质量测试数据，预先确定最佳天线切换位置；S2：测算通信终端的当前位置；S3：根据所述当前位置与所述最佳天线切换位置来判断是否切换定向天线；如果所述当前位置在所述最佳天线切换位置内，则进入下一步骤；否则返回步骤S2；S4：执行所述通信终端的定向天线的切换。本发明不需要对现有网络进行改动，仅改变通信终端的结构，即可实现使得用户只通过一个定向天线与服务小区进行数据交换，而无法与非服务小区进行数据交换，保证了频谱利用率的同时有效抑制带状覆盖小区的同频干扰问题。
The invention discloses a method for suppressing co-channel interference based on location information, comprising the following steps: S1: predetermine the optimal antenna switching position according to the full-line field strength coverage test data and service quality test data; S2: measure the current position of the communication terminal position; S3: determine whether to switch the directional antenna according to the current position and the optimal antenna switching position; if the current position is within the optimal antenna switching position, enter the next step; otherwise, return to step S2; S4: Perform switching of the directional antenna of the communication terminal. The invention does not need to change the existing network, only changes the structure of the communication terminal, so that the user can exchange data with the serving cell only through one directional antenna, but cannot exchange data with the non-serving cell, thus ensuring the spectrum utilization rate. At the same time, it can effectively suppress the co-channel interference problem of the banded coverage cells.
Description
Technical Field
The invention relates to a co-channel interference suppression method based on position information, and also relates to a communication terminal using the co-channel interference suppression method based on the position information, belonging to the technical field of communication.
Background
The term "co-channel interference" refers to interference caused by unwanted signals to a receiver receiving co-channel desired signals when the unwanted signals and the desired signals use the same carrier frequency. For a cell-based communication system, in order to increase the utilization rate of frequency and increase the capacity of the system, data transmission is generally implemented in a frequency reuse manner. This results in many small geographical areas using the same frequency within the service area covered by the provider, and thus the small geographical areas are called co-frequency cells. The interference generated between these co-channel cells is called co-channel interference. Currently, communication systems in China generally adopt a frequency multiplexing technology to increase the efficiency of frequency spectrums. When a small geographic area is continuously split, the service area of a base station is continuously reduced, the co-frequency multiplexing coefficient is continuously increased, and a large amount of co-frequency interference replaces artificial noise and other interference and becomes the most important constraint for a cell-based communication system. At this time, the mobile radio environment is changed from a past noise-limited environment to an interference-limited environment.
In railway, highway, coastal, etc. scenarios, cells often employ band coverage. For example, in an LTE-R system in a railway scene, the system is covered in a band shape, and a same-frequency networking mode is mostly adopted, which is a flexible networking mode and does not need to plan a frequency spectrum. The frequency reuse coefficient is 1 or close to 1 by the same-frequency networking mode, so that the frequency spectrum utilization rate is effectively improved. However, when a communication user between two adjacent cells uses the same spectrum resource when communicating with the base station, the user using the spectrum resource may suffer from severe inter-cell interference. Therefore, the problem of co-frequency interference introduced while improving the utilization rate of the system spectrum by the banded coverage cell co-frequency networking is also urgently to be solved.
At present, methods for inhibiting co-channel interference between cells of an LTE-R system mainly comprise a partial frequency scheme and a soft frequency reuse scheme, and the two schemes have the advantages of flexible and simple deployment and obvious anti-interference effect, but have the defect of insufficient utilization of frequency spectrum resources.
Disclosure of Invention
The invention provides a co-channel interference suppression method based on position information.
Another technical problem to be solved by the present invention is to provide a communication terminal using a co-channel interference suppression method based on location information.
In order to achieve the purpose, the invention adopts the following technical scheme:
a co-channel interference suppression method based on position information comprises the following steps:
s1: according to the full-line field intensity coverage test data and the service quality test data, the optimal antenna switching position is determined in advance;
s2: measuring and calculating the current position of the communication terminal;
s3: judging whether to switch a directional antenna according to the current position and the optimal antenna switching position; if the current position is within the optimal antenna switching position, entering the next step; otherwise, returning to the step S2;
s4: performing a handover of a directional antenna of the communication terminal.
Preferably, the determination of whether the current position of the communication terminal is within the optimal antenna switching position is based on the longitude and latitude of the communication terminal, and if the longitude X1 and the latitude Y1 of the current position of the communication terminal are both within the longitude range X and the latitude range Y of the optimal antenna switching position, the current position of the communication terminal is determined to be within the optimal antenna switching position.
Preferably, whether the current position of the communication terminal is within the optimal antenna switching position is judged in advance according to the operating speed of the communication terminal and the current position of the communication terminal.
Preferably, the interference region where co-channel interference occurs is only present at the cell edge, and the interference region is discontinuously distributed in a band shape.
A communication terminal comprises a control terminal, two directional antennas and a switching terminal which is arranged corresponding to each directional antenna; the control end is respectively connected with the switching ends, and each switching end is connected with the corresponding directional antenna;
the control end controls the switching of the directional antenna by using the same frequency interference suppression method based on the position information.
Preferably, the control terminal obtains current position information transmitted by the vehicle-mounted transponder in the operation process of the communication terminal, and judges whether to select a corresponding directional antenna for switching or not according to the current position information.
Wherein preferably said two directional antennas are configured to: in a plane perpendicular to the traveling direction of the communication terminal, the main lobe of one directional antenna forms an angle of about 25-50 degrees with the traveling direction; the main lobe of the other directional antenna makes an angle of about 145-115 deg. with the direction of travel.
Wherein preferably said two directional antennas are configured to: main lobes of the two directional antennas are perpendicular to each other in a plane perpendicular to a traveling direction of the communication terminal, and one is directed forward in the traveling direction; the other towards the rear in the direction of travel.
Preferably, the switching end is implemented by using an adjustable attenuator, the control end controls the adjustable attenuator to be adjusted to the maximum so as to close a communication channel where an antenna connected with the adjustable attenuator is located, and the control end controls the adjustable attenuator to be adjusted to the minimum so as to implement data transceiving through the antenna connected with the adjustable attenuator.
The invention has the following technical advantages: 1) the same frequency interference suppression can be realized only by changing the structure of the communication terminal without changing the existing network, so the cost is low and the reliability is high; 2) the communication terminal adopted by the invention comprises two directional antennas, a software radio module for controlling the antennas and an adjustable attenuator thereof, and the equipment has the advantages of simple structure, low cost and wide application prospect; 3) according to the position information obtained by the vehicle-mounted transponder, whether the corresponding antenna is selected for switching is judged, so that a user can exchange data with a serving cell only through one directional antenna but cannot exchange data with a non-serving cell, the frequency spectrum utilization rate is improved, and the problem of co-channel interference of a strip-shaped coverage cell is effectively suppressed.
Drawings
FIG. 1 is a schematic diagram of base station distribution of a strip coverage cell;
fig. 2 is a flowchart of a co-channel interference suppression method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a communication terminal performing directional antenna switching according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a communication terminal according to an embodiment of the present invention.
Detailed Description
The technical contents of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
In order to solve the problem of co-channel interference introduced by the same-frequency networking of the banded coverage cell while improving the utilization rate of the system spectrum, as shown in fig. 1, the invention provides a co-channel interference suppression method based on position information, which is applied to a communication terminal 10 shown in fig. 4. The communication terminal 10 includes a control terminal 15 and two antennas 12A and 12B.
The co-channel interference suppression method based on the position information comprises the following steps:
step S1: the optimal antenna switching position is predetermined.
Since the cells covered by each base station are distributed in a strip shape, for example, along the railway and the coastline, the areas where co-channel interference occurs in adjacent cells (referred to as interference areas) only appear at the cell edge, and the interference areas are discontinuously distributed in a strip shape. Therefore, by using the field intensity coverage test of the whole line and the service quality test of the whole line, the optimal antenna switching position can be determined based on the tested data.
The optimal antenna switching position is located within the interference area and has a determined longitude and latitude range as the antenna switching position range. In this optimal antenna switching position, the reference signal power (RSRP) of the base station to be switched is greater than-105 dBm. The optimal antenna switching position is a position area (e.g., an area between 112 ° 20 'east longitude to 112 ° 40' east longitude and 39 ° 56 'north latitude to 39 ° 57', hereinafter referred to as longitude area X and latitude area Y) composed of a longitude range and a latitude range from a reference signal power (RSRP) of the base station to be switched greater than-105 dBm to a reference signal power (RSRP) of the current serving base station less than-105 dBm. Within the optimum antenna switching position, switching of the communication base station is performed to ensure communication quality.
Step S2: measuring and calculating the current position of a communication terminal
The control end reads information of a line positioning reference transponder (LRBG for short) through the vehicle-mounted transponder, and then the current position of the communication terminal can be measured and calculated. Taking the LTE-R system in the railway scenario shown in fig. 1 as an example, when a user performs data interaction with a certain serving cell, the communication terminal 10 located on the train 11 selects the antenna 12 corresponding to the base station of the serving cell, and obtains a downlink signal from the base station. And then demodulating the downlink signal to obtain data sent by the base station. Then, the communication terminal 10 transmits an uplink signal to the corresponding base station through the directional antenna 12 of the communication terminal according to the received data from the base station, so that the base station demodulates the uplink signal to obtain the data fed back by the communication terminal 10.
The user is in a moving state along with the train in the process of data interaction with a certain service cell, namely the user does not stand on the same place to realize data interaction with the certain service cell. As shown in fig. 1, the antenna 12 moves along the road as the train 11 travels. Then, when the user performs data interaction with a certain serving cell, the communication terminal 10 selects an antenna corresponding to the base station of the certain serving cell to implement data interaction with the base station, and a communication path is established between the antenna and the base station.
As the user moves, the control terminal 15 of the communication terminal 10 obtains current position information using the communication data. Therefore, the control terminal 15 in the communication terminal 10 shown in fig. 3 acquires the longitude and latitude of the location point in real time through the communication data of the vehicle-mounted transponder during the movement of the user. The control terminal 15 may be implemented by a software radio module (software radio for short).
Alternatively, each antenna 12 of the communication terminal 10 may employ a directional antenna. The directional antenna has directivity, and it is particularly strong to transmit and receive electromagnetic waves only in one or more specific directions, while the transmission and reception of electromagnetic waves in other directions are zero or very small. For example, the front-to-back ratio of the directional antenna, i.e., the ratio of the front-to-back power gain of the directional antenna, is greater than 35 db; the side lobe ratio of the directional antenna is greater than 26 decibels. As shown in fig. 3, two directional antennas 12 are disposed within the communication terminal 10 and are configured to: the main lobe of one directional antenna 12A makes an angle of about 25-50 °, preferably 45 °, with the direction of travel in a plane perpendicular to the direction of travel of the communication terminal 10; the main lobe of the other directional antenna 12B is angled approximately 145-115 deg., preferably 135 deg., to the direction of travel such that the two directional antennas are directed forward and rearward, respectively, of the direction of travel of the communication terminal. Preferably, in a plane perpendicular to the direction of travel of the communication terminal 10, the main lobes of the two directional antennas 12 are perpendicular to each other, and one is directed forward in the direction of travel; the other towards the rear in the direction of travel. The range of the included angle can be adjusted according to the layout conditions of the base stations on two sides of the road. Taking a railway as an example, the base stations are usually arranged within 30-50 meters on both sides of the road, so the directivity of the directional antenna can ensure that two directional antennas positioned on a train can communicate with the base stations along the road with higher communication quality, and strong interference does not exist between the two directional antennas.
In this way, the advantage of arranging the directional antennas is to ensure that each directional antenna only receives downlink signals or transmits uplink signals to the base station in the direction of the antenna during the movement of the user. This is because the base stations are distributed in a band shape along the railway, and therefore, two adjacent base stations are located in front of and behind (with respect to the traveling direction of the communication terminal) the traveling direction of the communication terminal 10.
Step S3, determining whether the current position of the communication terminal enters the optimal antenna switching position to decide whether to switch the directional antenna.
And comparing the current position of the communication terminal obtained by the control terminal with the preset optimal antenna switching position to determine whether to select a corresponding antenna for switching. Specifically, as shown in fig. 3, when the current position of the communication terminal obtained by the control end is consistent with the optimal antenna switching position, the control end controls to switch the antenna currently performing data transceiving to another antenna for data transceiving, so as to perform data interaction with the same serving cell through the other antenna. Here, whether or not the current position of the communication terminal coincides with the optimum antenna switching position is determined based on the longitude and latitude where the communication terminal is located. If the longitude X1 and the latitude Y1 of the current position of the communication terminal are both within the longitude range X and the latitude range Y of the optimum antenna switching position (i.e., X1 ∈ X and Y1 ∈ Y), the next step S4 is entered to perform switching of the directional antenna.
As shown in fig. 3, when the position information obtained by the control end is not at the optimal antenna switching position, it indicates that the user does not move to the edge of the cell, and therefore, it is not necessary to switch from the antenna currently receiving and transmitting data to another antenna, and the user continues to perform data interaction with the current serving cell. That is, the user does not need to switch from the current serving cell to another serving cell for data interaction, and continues to obtain the current location through the control end (step S2 is executed). In the process, data exchange is carried out with the serving cell only through one directional antenna, but data exchange cannot be carried out with the non-serving cell, and the co-frequency interference from the non-serving cell to the user is effectively reduced.
Step S4: a switching of the directional antenna is performed.
In step S3, when it is determined that the communication terminal has traveled to within the range of the optimal antenna switching position or is about to enter the range according to the current position of the communication terminal, the control end sends antenna switching information to switch the two directional antennas.
As shown in fig. 3, when the location information obtained by the control end and the determined optimal antenna switching location indicate that the user moves to the edge of the cell and needs to perform handover, at this time, it needs to switch from the current data transceiving antenna to another antenna to implement data interaction between the user and the next serving cell, and the location information is continuously obtained by the control end (step S2 is executed). The process also ensures that data exchange is carried out with the service cell only through one directional antenna, but data exchange can not be carried out with the non-service cell, and the co-frequency interference from the non-service cell to the user is effectively reduced.
The following describes a communication terminal using a co-channel interference suppression method based on location information according to the present invention with reference to the accompanying drawings.
In addition, as shown in fig. 3 and 4, the present invention further provides a communication terminal 10, which includes a control terminal 15, at least two directional antennas, and a switching terminal 13A or 13B connected to the directional antennas one by one. The control terminal 15 is connected to all the switch terminals 13A or 13B, and each switch terminal 13A or 13B is connected to a corresponding one of the directional antennas 12A or 12B.
And the control end 15 is used for obtaining the position of the current train, comparing the current position with the optimal switching position, and judging whether to control the switching end 13A or 13B so as to select the corresponding antenna for switching.
Specifically, the control terminal 15 may be implemented by a software radio module (software radio for short), and the software radio module monitors the position information of the train in real time to obtain the current position information of the train.
And the control terminal compares the obtained current position of the communication terminal with the optimal switching position information to determine whether to select a corresponding antenna for switching. When the control end judges that the obtained current position of the communication terminal is consistent with the optimal switching antenna position, the control end controls a first switching end 13A connected with a current directional antenna 12A to close a current communication channel; and controls the second switching terminal 13B connected to the other directional antenna 12B so that the communication terminal 10 performs data interaction with the same serving cell through the other directional antenna. The switching end can be realized by adopting an adjustable attenuator, the adjustable attenuator is controlled by the control end to be adjusted to the maximum, and then a communication channel where an antenna connected with the adjustable attenuator is located can be closed; the control end controls the adjustable attenuator to be adjusted to the minimum, so that the antenna connected with the adjustable attenuator can realize the data receiving and transmitting. And the control end can obtain the reference signal received power in the user communication process in the communication.
When the current position obtained by the control terminal is inconsistent with the optimal switching antenna position, the user does not move to the edge of the cell, the user continues to perform data interaction with the current service cell without performing handover, and the reference signal receiving power in the user communication process is continuously obtained through the control terminal.
The co-channel interference suppression method based on the position information and the corresponding communication terminal have the following technical advantages: 1) the same frequency interference suppression can be realized only by changing the structure of the communication terminal without changing the existing network, so the cost is low and the reliability is high; 2) the communication terminal adopted by the invention comprises two directional antennas, a software radio module for controlling the antennas and an adjustable attenuator thereof, and the equipment has the advantages of simple structure, low cost and wide application prospect; 3) according to the position information obtained by the vehicle-mounted transponder, whether the corresponding antenna is selected for switching is judged, so that a user can exchange data with a serving cell only through one directional antenna but cannot exchange data with a non-serving cell, the frequency spectrum utilization rate is improved, and the problem of co-channel interference of a strip-shaped coverage cell is effectively suppressed.
The technical solution of the present invention is explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereto can be made without departing from the true spirit of the invention, which is to be accorded the full scope of the claims herein.
Claims (9)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150257164A1 (en) * | 2012-09-27 | 2015-09-10 | Lg Electronics Inc. | Method and apparatus for controlling interference in wireless communication system |
| CN111342234A (en) * | 2018-12-19 | 2020-06-26 | 上海新岸线电子技术有限公司 | Base station electrically-controlled antenna |
| CN112671500A (en) * | 2020-07-07 | 2021-04-16 | 北京交通大学 | Same frequency interference suppression method and corresponding communication terminal |
| CN112672311A (en) * | 2020-12-17 | 2021-04-16 | 中国铁塔股份有限公司 | Communication device and train |
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- 2022-01-06 CN CN202210008658.1A patent/CN114095111A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150257164A1 (en) * | 2012-09-27 | 2015-09-10 | Lg Electronics Inc. | Method and apparatus for controlling interference in wireless communication system |
| CN111342234A (en) * | 2018-12-19 | 2020-06-26 | 上海新岸线电子技术有限公司 | Base station electrically-controlled antenna |
| CN112671500A (en) * | 2020-07-07 | 2021-04-16 | 北京交通大学 | Same frequency interference suppression method and corresponding communication terminal |
| CN112672311A (en) * | 2020-12-17 | 2021-04-16 | 中国铁塔股份有限公司 | Communication device and train |
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