CN108259112B - Method and device for eliminating base station interference based on time slot - Google Patents
Method and device for eliminating base station interference based on time slot Download PDFInfo
- Publication number
- CN108259112B CN108259112B CN201611251761.XA CN201611251761A CN108259112B CN 108259112 B CN108259112 B CN 108259112B CN 201611251761 A CN201611251761 A CN 201611251761A CN 108259112 B CN108259112 B CN 108259112B
- Authority
- CN
- China
- Prior art keywords
- base station
- interference
- time slot
- interfered
- uplink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H04J11/0056—Inter-base station aspects
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method and a device for eliminating base station interference based on time slots, wherein the method comprises the following steps: acquiring interference information of a base station and judging an interference mode of the base station; and adjusting the protection symbols in the special time slot of the interfered base station according to the interference mode. According to the invention, by improving the setting mode of the protection time slot, the ratio of the downlink time slot, the protection time slot and the uplink time slot of the special subframe is flexibly and automatically adjusted by considering the uplink and downlink capacity under the atmospheric waveguide, so that the interference avoidance and capacity allocation of TD-LTE are realized. The invention can accurately analyze the interference condition of the uplink subframe of the base station, judge the uplink and downlink traffic conditions of the station, calculate the optimal special subframe ratio, and simultaneously add the adjustment of the special time slot of the interference source base station, more comprehensively eliminate the interference effect under the atmospheric waveguide effect and improve the user perception.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for eliminating base station interference based on time slots.
Background
This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, and is believed to provide the reader with useful background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that the description in this section is for purposes of illustration and is not an admission of prior art.
When the eNodeB sends UE data, a radio wave needs a period of time from the eNodeB to the UE, and since the distances between the UEs and the eNodeB are different, the UE close to the eNodeB receives downlink signals first, and the UE far from the eNodeB receives downlink signals later. After a downlink timeslot, a guard interval needs to be reserved, and in the guard interval, it is ensured that all UEs receive downlink signals and process the signals. Then, all UEs can transmit uplink signals at the same time in the upcoming uplink timeslot, i.e. UE synchronization within the cell.
Meanwhile, in a TD-LTE (Time Division Long Term Evolution) system, an uplink and a downlink use the same frequency and operate in different Time slots, and when there is a certain distance between base stations with the same frequency, due to propagation delay of wireless signals, uplink and downlink signals between the base stations overlap to some extent, which causes interference. As shown in fig. 1, in order to prevent mutual interference between uplink and downlink signals of different base stations, a guard time slot needs to be set in an uplink time slot and a downlink time slot. At present, a TD-LTE protection time slot setting mode is mainly characterized in that a fixed protection time slot is manually input in an operation and maintenance center in an instruction mode, so that uplink and downlink protection is realized.
In the prior art, as shown in fig. 2, in a TD-LTE system, each frame (10ms) has 10 subframes, each subframe has a duration of 1ms, and the subframes are divided into 3 types: the system comprises an uplink subframe, a downlink subframe and a special subframe, wherein the special subframe is used for separating the downlink subframe from the uplink subframe. As shown in fig. 3, where each subframe contains 14 symbols, each symbol for 0.07 ms. As shown in fig. 4, in the TD-LTE macro base station, a complete uplink and downlink cycle includes 5 subframes (downlink subframe-special subframe-uplink subframe-downlink or uplink subframe-downlink subframe), and the protection time slot is mainly set in the special subframe in the following manner: allocating 14 symbols of the special subframe, and allocating the symbols to downlink data, a protection time slot and an uplink time slot. Currently, 14 symbols of the special subframe are allocated to be a specific mode, and the ratio of downlink time slots, guard time slots and uplink time slots is 10: 2 or 3: 9: 2, and the like. It is generally considered that a wireless signal can only propagate along a straight line and beyond a certain distance, and the wireless signal can be rapidly attenuated and cannot cause interference to a long-distance base station, and the time of each OFDM (Orthogonal Frequency Division Multiplexing) symbol is 1ms/14 ≈ 0.0714 ms. For example, the A base station is configured according to a special subframe 10: 2, and the protection time slot of two OFDM symbols is 0.0714ms 3 x 108The transmission protection distance of 21.4km is m/s, theoretically, station signals exceeding the protection distance are attenuated to be small and cannot cause interference to the A base station, but under the condition of an atmospheric waveguide effect generated under special terrain and weather conditions, electromagnetic waves can be transmitted at an ultra-long distance with low attenuation, and the transmission distance can even reach over 300 km. Therefore, in the case of the waveguide effect or the like, since the transmission distance of other base stations is longFar, the signal delay is large, and the signal delay is usually larger than the predetermined guard time slot, which occurs in the TD-LTE system and causes interference from a distant base station to a local base station.
Disclosure of Invention
The technical problem to be solved is how to provide a method and a device for eliminating base station interference based on time slots.
Aiming at the defects in the prior art, the invention provides a method and a device for eliminating base station interference based on time slots, which can comprehensively eliminate the interference effect under the atmospheric waveguide effect.
In a first aspect, the present invention provides a method for eliminating interference of a base station based on a time slot, including:
acquiring interference information of a base station and judging an interference mode of the base station;
and adjusting the protection symbols in the special time slot of the interfered base station according to the interference mode.
Optionally, the obtaining interference information of the base station includes:
and acquiring an interference signal on each uplink symbol, comparing the interference signal with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, determining that the interference mode of the current base station is trailing interference.
Optionally, the adjusting the guard symbols in the special time slot of the interfered base station according to the interference pattern includes:
and judging whether the interference affects the uplink signal in the special time slot and does not affect the uplink symbol in the uplink subframe, and modifying the special time slot ratio of the interfered base station.
Optionally, the method further includes positioning the interference source base station, and adjusting a guard symbol in a special time slot of the interference source base station; the positioning of the interference source base station specifically includes:
acquiring interference information of a protected time slot of an interfered base station;
acquiring interference information of a driving system on an interfered base station;
positioning the central position of the interfered base station;
calculating the directions of the interference source base station and the interfered base station;
calculating the distance between an interference source base station and the interfered base station according to the interference information of the protected time slot of the interfered base station and the interference information of a driving system on the interfered base station;
and positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station.
Optionally, the method further includes adjusting an uplink symbol in an uplink time slot of the interfered base station cluster or a downlink symbol in a downlink time slot of the interfering source base station, and specifically includes:
acquiring downlink service load information of an interference source base station and uplink service load information of an interfered base station;
modifying symbols in the time slot of the interference source base station with lower service load into protection symbols according to the downlink service load information of the interference source base station and the uplink service information of the interfered base station; or
And modifying the symbols in the time slot of the interfered base station with lower traffic load into protection symbols.
In another aspect, the present invention further provides a base station interference cancellation apparatus based on time slots, including:
the interference information acquisition unit is used for acquiring the interference information of the base station and judging the interference mode of the base station;
and the interference base station time slot adjusting unit is used for adjusting the protection symbols in the special time slot of the interfered base station according to the interference mode.
Optionally, the interference information obtaining unit includes:
and the interference information mode judging unit is used for comparing the interference signal on each uplink symbol with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, judging that the interference mode of the current base station is the trailing interference.
Optionally, the interfering base station timeslot adjusting unit includes:
and the special time slot ratio adjusting unit is used for judging whether the interference affects the uplink signal in the special time slot or not, and modifying the special time slot ratio of the interfered base station if the interference does not affect the uplink symbol in the uplink subframe.
Optionally, the mobile terminal further includes an interferer base station timeslot adjusting unit, configured to locate the interferer base station and adjust the guard symbols in the special timeslot.
Optionally, the scrambling source base station timeslot adjusting unit includes:
the information acquisition unit is used for acquiring interference information of the protected time slot of the interfered base station; acquiring interference information of a driving system on an interfered base station;
the central position positioning unit is used for positioning the central position of the interfered base station;
the direction calculation unit is used for calculating the directions of the interference source base station and the interfered base station;
the distance determining unit is used for calculating the distance between the interference source base station and the interfered base station according to the interference information of the protected time slot of the interfered base station and the interference information of the driving system on the interfered base station;
and the positioning unit is used for positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station.
According to the technical scheme, the method and the device for eliminating the interference of the base station based on the time slot have the advantages that the setting mode of the protection time slot is improved, the ratio of the downlink time slot, the protection time slot and the uplink time slot of the special subframe is flexibly and automatically adjusted by considering the uplink and downlink capacity under the atmospheric waveguide, and therefore the interference avoidance and capacity allocation of the TD-LTE are achieved. The invention can accurately analyze the interference condition of the uplink subframe of the base station, judge the uplink and downlink traffic conditions of the station, calculate the optimal special subframe ratio, and simultaneously add the adjustment of the special time slot of the interference source base station, more comprehensively eliminate the interference effect under the atmospheric waveguide effect and improve the user perception.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a TD-LTE frame structure in the prior art;
FIG. 2 is a schematic diagram of a subframe structure of a TD-LTE frame structure in the prior art;
FIG. 3 is a schematic diagram of a subframe symbol of a TD-LTE frame structure in the prior art;
FIG. 4 is a diagram illustrating a TD-LTE special sub-frame structure in the prior art;
fig. 5 is a flow chart illustrating a method for interference cancellation in a base station based on time slots according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an interference cancellation process in the embodiment shown in fig. 1;
FIG. 7 is a diagram illustrating interference from a base station according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a method for interference cancellation in a base station based on time slots according to another embodiment of the present invention;
fig. 9 is a schematic diagram of the center of the interfered base station in the embodiment shown in fig. 8;
FIG. 10 is a schematic diagram of the base station for locating the interferer shown in FIG. 8;
fig. 11 is a schematic diagram of uplink symbols in a special timeslot of an interference source base station according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a base station interference cancellation device based on time slots according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
As shown in fig. 5, the present invention provides a method for eliminating interference from a base station based on a time slot, which includes: acquiring interference information of a base station and judging an interference mode of the base station; and adjusting the protection symbols in the special time slot of the interfered base station according to the interference mode. The following is a method for interference cancellation in a base station based on time slots.
As shown in fig. 6, after the base station starts operation, the base station detects the interference condition of its own uplink subframe in real time, generates an uplink subframe interference condition measurement report, and reports the uplink subframe interference condition measurement report to the base station interference cancellation device through an S1 interface, and the base station interference cancellation device determines the interference information and uplink and downlink traffic of the carrier frequency of the base station through the reported uplink subframe interference condition measurement report, calculates the special subframe timeslot proportion scheme of the carrier frequency, and issues all the involved base stations for adjustment.
In the invention, the interference signal on each uplink symbol of each base station is collected and compared with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, the interference mode of the current base station is the trailing interference. Specifically, as shown in fig. 7, if the uplink interference signal is greater than-105 dbm as the uplink interference criterion threshold, it can be seen that interference is received in the first 2 uplink symbols of S0 and S1. And if the disturbed process has a decreasing phenomenon, namely a tailing phenomenon, judging that the base station group disturbed by the phenomenon is caused by an atmospheric waveguide phenomenon. The base station interference elimination device analyzes the interference condition of the base station according to the data reported by the base station, if a large number of base stations (larger than a certain value, can be systematically judged or can be set by a background) in the same area have uplink interference, an analysis mode is started, the base station interference elimination device calculates the special subframe time slot matching scheme of the carrier frequency, and all the related base stations are issued for adjustment.
In the present invention, adjusting the guard symbols in the special time slot of the interfered base station according to the interference pattern comprises: and judging whether the interference affects the uplink signal in the special time slot and does not affect the uplink symbol in the uplink subframe, and modifying the special time slot ratio of the interfered base station. Because the adjustment of the base station protection time slot can cause inconsistent time slot proportion with the surrounding base stations and influence the user terminal, the unified adjustment must be carried out according to the base station cluster with the isolation zone. If the uplink interference only affects the uplink symbols in the special subframes and does not affect the uplink symbols in the uplink subframes, the base station interference elimination device issues an instruction to modify the special subframes of the interfered base station cluster, and the special time slot of the base station in the whole cluster is modified by taking the number of the interfered uplink symbols in the special subframes of the interfered base station as the standard. Specific examples thereof include: the ratio of the special time slots of the base station in an interference cluster, namely the ratio of the special time slots of the base station in the interference cluster to the uplink, the protection and the downlink, is 3: 2: 9, the number of the uplink symbols is 9, the number of the interfered uplink symbols is 3, the former 3 uplink symbols are modified into the protection time slots, namely the ratio of the special time slots of all the base stations in the interference cluster is modified into 3: 5: 6.
As shown in fig. 8, in the present invention, if there is interference after adjusting the guard symbols in the special time slot of the interfered base station, the guard symbols in the special time slot of the interfering base station need to be further adjusted. Because the number of the symbols of the special time slot of the TD-LTE base station is 14, which cannot be expanded, if all uplink symbols of the whole protection time slot of the interfered base station are interfered and the first L symbols of the uplink time slot are also interfered, the first L symbols of the original uplink subframe must be set as protection symbols not transmitting or receiving data except for adjusting the special time slot of the interfered base station, and the normal uplink capacity of the interfered base station must be lost. In order to avoid the uplink capacity loss of the interfered base station, the base station interference elimination device can separate out the interference source base station of the atmospheric waveguide effect according to the interfered symbol and cell. Specifically, the method includes positioning an interference source base station, and adjusting a guard symbol in a special time slot of the interference source base station, where positioning the interference source base station specifically includes: acquiring interference information of a protected time slot of an interfered base station; acquiring interference information of a driving system on an interfered base station; positioning the central position of the interfered base station; calculating the directions of the interference source base station and the interfered base station; calculating the distance between an interference source base station and the interfered base station according to the interference information of the protected time slot of the interfered base station and the interference information of a driving system on the interfered base station; and positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station.
Analyzing the interference condition of the interfered base station protection time slot, the number N of the protection symbols of the interfered special sub-frame and the number M of the uplink symbols of the interfered special time slot. For example, if the ratio of the special time slots of the interfered base station is 9: 3: 2, the number of uplink symbols of the interfered special subframe is 2, and 3 protection symbols of the special subframe are necessarily interfered.
And analyzing the interference condition of the uplink time slot of the interfered base station and the uplink symbol number L of the interfered uplink subframe. As shown in fig. 7, if the first 2 symbols are interfered, the number of uplink symbols of the interfered uplink subframe is 2.
As shown in fig. 9, the location of the interference source base station is located by the center position of the interfered base station. Because the longitude and latitude information of each base station is predetermined, when the location of the interference source base station of the interference source is determined, the central position of the interfered base station group needs to be determined, and the longitude of the interfered base station group is X respectively1，X2，X3...XnLatitude of Y1，Y2，Y3...Yn. Then the center longitude of the interfered base station group is
Central latitude of
As shown in fig. 10, because most of the antennas used by the TD-TLE base station are directional antennas, the positions of the interfering base station and the interfered base station can be calculated according to the azimuth of the most severe interfering cell of each interfered base station. The azimuth angle of the most serious interference cell of each interfered base station is respectively taken out by the base station interference elimination device, and the azimuth angles of the most serious interference cell of the base stations A, B and C1，θ2，θ3...θn. Calculating the direction of the interference source base station according to the azimuth angle of the most serious interference cell of each interfered base station
As shown in fig. 10, the distance between the interference source base station and the interfered base station is calculated according to the interference information of the protected time slot of the interfered base station and the interference information of the traveling system on the interfered base station. Namely, the number N of protected symbols of the interfered special subframe, the number M of uplink symbols of the interfered special subframe, the number L of uplink symbols of the uplink subframe, and the total number P of interfered symbols is N + M + L. The distance of each symbol is about 21.4km calculated according to the propagation speed of the electromagnetic wave, and the distance between the interference source base station and the interfered base station is S-P-21.4 km. For example, the interfered symbols of the interfered base station are: the number of the protection symbols in the special subframe is 3, the number of the uplink symbols in the special subframe is 2, and the number of the uplink symbols in the uplink time slot is 2, which are 7 symbols in total. The distance of each symbol is about 21.4km calculated according to the propagation speed of the electromagnetic wave, and 7 symbols are as follows: 7 x 21.4 km-149.8 km
As shown in fig. 10, the location of the interfering base station is located according to the position of the interfering base station and the interfered base station, the distance between the interfering base station and the interfered base station, and the center position of the interfered base station. For example, it is found that the interference source base station is calculated by taking the north as 0 degree at the interfered base station, and rotates by theta clockwiseaAnd then, the distance P x 21.4 km.
As shown in fig. 11, after the interference source base station is located, the base station interference cancellation apparatus modifies the special time slot of the interference source base station by sending an instruction, so as to ensure that the uplink time slot of the interfered base station is not interfered, that is, L downlink symbols in the special time slot of the interference source base station are reduced, and L protection symbols are increased. Therefore, the last downlink symbol of the interference source base station is advanced and falls into the protection symbol of the special subframe of the interfered base station through the atmospheric waveguide effect, so that the interference is eliminated.
As shown in fig. 8, in the present invention, if there is interference after adjusting the guard symbol in the special time slot of the interference source base station, it is necessary to further adjust the uplink symbol in the uplink time slot of the interference base station or the downlink symbol in the downlink time slot of the interference source base station. Specifically, the base station detects the interference condition of its own uplink subframe in real time to generate an uplink subframe interference condition measurement report, and reports the load condition of the base station to the base station interference cancellation device through an S1 interface, and if there are less than L uplink symbols of the interference source base station special time slot, in order to cancel the interference caused by the dry atmospheric waveguide effect of the interfered base station, it is necessary to adjust the downlink time slot of the interference source base station or the uplink time slot of the interfered base station. The method specifically comprises the following steps: acquiring downlink service load information of an interference source base station and uplink service load information of an interfered base station; modifying symbols in the time slot of the interference source base station with lower service load as protection symbols according to the downlink service load information of the interference source base station and the uplink service information of the interfered base station; or modifying the symbols in the time slot of the interfered base station with lower traffic load into protection symbols. Specifically, the base station interference elimination device compares the downlink service of the interference source base station with the uplink service of the interfered base station, compares the busy and idle degrees, and if one of the two is busy or even congested, modifies the symbol in the time slot of the other side to protect the symbol from receiving and transmitting data, thereby avoiding interference and simultaneously ensuring the capacity of the base stations in the two aspects.
In order to further embody the advantages of the method for eliminating interference of a base station based on time slots provided by the present invention, the present invention further provides a device for eliminating interference of a base station based on time slots, which applies the method, as shown in fig. 12, the device includes: the interference information acquisition unit is used for acquiring the interference information of the base station and judging the interference mode of the base station; and the interference base station time slot adjusting unit is used for adjusting the protection symbols in the special time slot of the interfered base station according to the interference mode. In the present invention, the specific working process of the time slot-based base station interference cancellation apparatus is similar to the flow of the above method, and can be executed by referring to the above method, which is not described in detail herein.
In the present invention, the interference information acquisition unit includes: and the interference information mode judging unit is used for comparing the interference signal on each uplink symbol with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, judging that the interference mode of the current base station is the trailing interference. The interference base station time slot adjusting unit comprises: and the special time slot ratio adjusting unit is used for judging whether the interference affects the uplink signal in the special time slot or not, and modifying the special time slot ratio of the interfered base station if the interference does not affect the uplink symbol in the uplink subframe. Adjusting the guard symbols in the special time slot of the interfered base station according to the interference pattern comprises: and judging whether the interference affects the uplink signal in the special time slot and does not affect the uplink symbol in the uplink subframe, and modifying the special time slot ratio of the interfered base station. Because the adjustment of the base station protection time slot can cause inconsistent time slot proportion with the surrounding base stations and influence the user terminal, the unified adjustment must be carried out according to the base station cluster with the isolation zone. If the uplink interference only affects the uplink symbols in the special subframes and does not affect the uplink symbols in the uplink subframes, the base station interference elimination device issues an instruction to modify the special subframes of the interfered base station cluster, and the special time slot of the base station in the whole cluster is modified by taking the number of the interfered uplink symbols in the special subframes of the interfered base station as the standard. Specific examples thereof include: the ratio of the special time slots of the base station in an interference cluster, namely the ratio of the special time slots of the base station in the interference cluster to the uplink, the protection and the downlink, is 3: 2: 9, the number of the uplink symbols is 9, the number of the interfered uplink symbols is 3, the former 3 uplink symbols are modified into the protection time slots, namely the ratio of the special time slots of all the base stations in the interference cluster is modified into 3: 5: 6.
The device also comprises an interference source base station time slot adjusting unit which is used for positioning the interference source base station and adjusting the protection symbols in the special time slot. The interference source base station time slot adjusting unit comprises: the information acquisition unit is used for acquiring interference information of the protected time slot of the interfered base station; acquiring interference information of a driving system on an interfered base station; the central position positioning unit is used for positioning the central position of the interfered base station; the direction calculation unit is used for calculating the directions of the interference source base station and the interfered base station; the distance determining unit is used for calculating the distance between the interference source base station and the interfered base station according to the interference information of the protected time slot of the interfered base station and the interference information of the driving system on the interfered base station; and the positioning unit is used for positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station. Analyzing the interference condition of the interfered base station protection time slot, the number N of the protection symbols of the interfered special sub-frame and the number M of the uplink symbols of the interfered special time slot. For example, if the ratio of the special time slots of the interfered base station is 9: 3: 2, the number of uplink symbols of the interfered special subframe is 2, and 3 protection symbols of the special subframe are necessarily interfered. And analyzing the interference condition of the uplink time slot of the interfered base station and the uplink symbol number L of the interfered uplink subframe. As shown in fig. 7, if the first 2 symbols are interfered, the number of uplink symbols of the interfered uplink subframe is 2.
As shown in fig. 9, the location of the interference source base station is located by the center position of the interfered base station. Because the longitude and latitude information of each base station is predetermined, when the location of the interference source base station of the interference source is determined, the central position of the interfered base station group needs to be determined, and the longitude of the interfered base station group is X respectively1，X2，X3...XnLatitude of Y1，Y2，Y3...Yn. Then the center longitude of the interfered base station group is
Central latitude of
As shown in fig. 10, because most of the antennas used by the TD-TLE base station are directional antennas, the positions of the interfering base station and the interfered base station can be calculated according to the azimuth of the most severe interfering cell of each interfered base station. The azimuth angle of the most serious interference cell of each interfered base station is respectively taken out by the base station interference elimination device, and the azimuth angles of the most serious interference cell of the base stations A, B and C1，θ2，θ3...θn. Calculating the direction of the interference source base station according to the azimuth angle of the most serious interference cell of each interfered base station
As shown in fig. 10, the distance between the interference source base station and the interfered base station is calculated according to the interference information of the protected time slot of the interfered base station and the interference information of the traveling system on the interfered base station. Namely, the number N of protected symbols of the interfered special subframe, the number M of uplink symbols of the interfered special subframe, the number L of uplink symbols of the uplink subframe, and the total number P of interfered symbols is N + M + L. The distance of each symbol is about 21.4km calculated according to the propagation speed of the electromagnetic wave, and the distance between the interference source base station and the interfered base station is S-P-21.4 km. For example, the interfered symbols of the interfered base station are: the number of the protection symbols in the special subframe is 3, the number of the uplink symbols in the special subframe is 2, and the number of the uplink symbols in the uplink time slot is 2, which are 7 symbols in total. The distance of each symbol is about 21.4km calculated according to the propagation speed of the electromagnetic wave, and 7 symbols are as follows: 7 x 21.4 km-149.8 km
As shown in fig. 10, the location of the interfering base station is located according to the position of the interfering base station and the interfered base station, the distance between the interfering base station and the interfered base station, and the center position of the interfered base station. For example, it is found that the interference source base station is calculated by taking the north as 0 degree at the interfered base station, and rotates by theta clockwiseaAnd then, the distance P x 21.4 km.
The device of the invention also comprises an interfered base station uplink time slot adjusting unit and an interference source base station time slot adjusting unit, and the device specifically comprises: acquiring downlink service load information of an interference source base station and uplink service load information of an interfered base station; modifying symbols in the time slot of the interference source base station with lower service load as protection symbols according to the downlink service load information of the interference source base station and the uplink service information of the interfered base station; or modifying the symbols in the time slot of the interfered base station with lower traffic load into protection symbols. The base station interference elimination device compares the downlink service of the interference source base station with the uplink service of the interfered base station, compares the busy and idle degrees, and if one of the two is busy or even congested, modifies the symbol in the time slot of the other party into a protection symbol to not receive and transmit data, thereby avoiding interference and simultaneously ensuring the capacity of the base stations in two aspects.
In summary, according to the method and device for eliminating interference of a base station based on a time slot, provided by the invention, by improving the setting mode of a protection time slot, the ratio of a downlink time slot, a protection time slot and an uplink time slot of a special subframe is flexibly and automatically adjusted by considering the uplink and downlink capacities under an atmospheric waveguide, so that the interference avoidance and capacity allocation of the TD-LTE are realized. The invention can accurately analyze the interference condition of the uplink subframe of the base station, judge the uplink and downlink traffic conditions of the station, calculate the optimal special subframe ratio, and simultaneously add the adjustment of the special time slot of the interference source base station, more comprehensively eliminate the interference effect under the atmospheric waveguide effect and improve the user perception.
According to the intelligent cash register system and the intelligent cash register method, the first cash register terminal, the second cash register terminal and the third cash register management terminal which are in communication connection with the server side are suitable for a multi-scene strong concurrent cash register management system, so that the current operation in multiple modes such as department goods, shopping centers, supermarkets and the like is met.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the present invention may be utilized alone or in combination with one or more other aspects and/or embodiments thereof.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. A method for eliminating interference of a base station based on time slots is characterized by comprising the following steps:
acquiring interference information of a base station and judging an interference mode of the base station;
adjusting a protection symbol in a special time slot of the interfered base station according to the interference mode;
the method further includes adjusting an uplink symbol in an uplink time slot of the interfered base station or a downlink symbol in a downlink time slot of the interference source base station, and specifically includes:
acquiring downlink service load information of an interference source base station and uplink service load information of an interfered base station;
modifying symbols in the time slot of the interference source base station with lower service load as protection symbols according to the downlink service load information of the interference source base station and the uplink service load information of the interfered base station; or
And modifying the symbols in the time slot of the interfered base station with lower traffic load into protection symbols.
2. The method of claim 1, wherein the obtaining interference information of the base station comprises:
and acquiring an interference signal on each uplink symbol, comparing the interference signal with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, determining that the interference mode of the current base station is trailing interference.
3. The method of claim 1, wherein the adjusting the guard symbols in the special time slot of the interfered base station according to the interference pattern comprises:
and if the interference is judged to affect the uplink signal in the special time slot and not affect the uplink symbol in the uplink subframe, modifying the special time slot ratio of the interfered base station.
4. The method of claim 1, further comprising locating an interferer base station and adjusting guard symbols in a special timeslot of the interferer base station; the positioning of the interference source base station specifically includes:
acquiring interference information of a protected time slot of an interfered base station;
acquiring interference information of an uplink time slot of an interfered base station;
positioning the central position of the interfered base station;
calculating the directions of the interference source base station and the interfered base station;
calculating the distance between an interference source base station and the interfered base station according to the interference information of the protected time slot of the interfered base station and the interference information of the uplink time slot of the interfered base station;
and positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station.
5. A base station interference cancellation apparatus based on time slots, comprising:
the interference information acquisition unit is used for acquiring the interference information of the base station and judging the interference mode of the base station;
the interference source base station time slot adjusting unit is used for adjusting the protection symbol in the special time slot of the interfered base station according to the interference mode;
the interference source base station time slot adjusting unit comprises:
the information acquisition unit is used for acquiring interference information of the protected time slot of the interfered base station; acquiring interference information of an uplink time slot of an interfered base station;
the central position positioning unit is used for positioning the central position of the interfered base station;
the direction calculation unit is used for calculating the directions of the interference source base station and the interfered base station;
a distance determining unit, configured to calculate a distance between an interference source base station and an interfered base station according to interference information of the protected time slot of the interfered base station and interference information of an uplink time slot of the interfered base station;
and the positioning unit is used for positioning the position of the interference source base station according to the position of the interference source base station and the interfered base station, the distance between the interference source base station and the interfered base station and the central position of the interfered base station.
6. The base station interference cancellation apparatus according to claim 5, wherein the interference information obtaining unit includes:
and the interference information mode judging unit is used for comparing the interference signal on each uplink symbol with a preset threshold, and if the uplink interference signal is greater than the preset threshold and the interference signal of the uplink symbol is decreased progressively, judging that the interference mode of the current base station is the trailing interference.
7. The base station interference cancellation apparatus of claim 5, wherein the interfering base station timeslot adjusting unit includes:
and the special time slot ratio adjusting unit is used for modifying the special time slot ratio of the interfered base station if the interference is judged to affect the uplink signal in the special time slot and not affect the uplink symbol in the uplink subframe.
8. The base station interference cancellation apparatus of claim 5, further comprising an interferer base station time slot adjustment unit configured to locate an interferer base station and adjust the guard symbols in the special time slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611251761.XA CN108259112B (en) | 2016-12-29 | 2016-12-29 | Method and device for eliminating base station interference based on time slot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611251761.XA CN108259112B (en) | 2016-12-29 | 2016-12-29 | Method and device for eliminating base station interference based on time slot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108259112A CN108259112A (en) | 2018-07-06 |
| CN108259112B true CN108259112B (en) | 2020-03-24 |
Family
ID=62722037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611251761.XA Active CN108259112B (en) | 2016-12-29 | 2016-12-29 | Method and device for eliminating base station interference based on time slot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108259112B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831011B (en) * | 2018-08-10 | 2021-10-29 | 大唐移动通信设备有限公司 | Far-end interference characteristic optimization method and device |
| CN110971312B (en) * | 2018-09-30 | 2021-08-17 | 中国电信股份有限公司 | Method and device for processing interference between base stations caused by atmospheric waveguide |
| CN115664579A (en) | 2018-11-02 | 2023-01-31 | 中兴通讯股份有限公司 | Interference management in a wireless system |
| CN111385829B (en) * | 2018-12-27 | 2021-10-29 | 大唐移动通信设备有限公司 | Method, system and device for avoiding far-end interference |
| CN113303005B (en) | 2019-01-11 | 2023-11-17 | 中兴通讯股份有限公司 | Remote interference suppression resource allocation |
| CN110557772B (en) * | 2019-08-22 | 2021-08-17 | 西安电子科技大学 | Wireless communication interference prediction method for atmospheric waveguide |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101341709A (en) * | 2005-10-27 | 2009-01-07 | 高通股份有限公司 | Pilot signal transmission for an orthogonal frequency division wireless communication system |
| CN101795473A (en) * | 2009-02-03 | 2010-08-04 | 大唐移动通信设备有限公司 | Methods and devices for determining special subframe configuration mode and time-domain resource use mode |
| CN103458435A (en) * | 2012-05-31 | 2013-12-18 | 北京信威通信技术股份有限公司 | Interference channel avoidance method for common-frequency networking base stations |
| CN106161314A (en) * | 2015-03-31 | 2016-11-23 | 中国移动通信集团公司 | Wireless signal interference method and device |
| CN106255147A (en) * | 2016-10-10 | 2016-12-21 | 广州市瀚云信息技术有限公司 | A kind of TDD LTE system uplink interference testing tool and method of testing |
-
2016
- 2016-12-29 CN CN201611251761.XA patent/CN108259112B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101341709A (en) * | 2005-10-27 | 2009-01-07 | 高通股份有限公司 | Pilot signal transmission for an orthogonal frequency division wireless communication system |
| CN101795473A (en) * | 2009-02-03 | 2010-08-04 | 大唐移动通信设备有限公司 | Methods and devices for determining special subframe configuration mode and time-domain resource use mode |
| CN103458435A (en) * | 2012-05-31 | 2013-12-18 | 北京信威通信技术股份有限公司 | Interference channel avoidance method for common-frequency networking base stations |
| CN106161314A (en) * | 2015-03-31 | 2016-11-23 | 中国移动通信集团公司 | Wireless signal interference method and device |
| CN106255147A (en) * | 2016-10-10 | 2016-12-21 | 广州市瀚云信息技术有限公司 | A kind of TDD LTE system uplink interference testing tool and method of testing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108259112A (en) | 2018-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108259112B (en) | Method and device for eliminating base station interference based on time slot | |
| CN109451430B (en) | Environment sensing method and communication equipment | |
| CN102655650B (en) | Method and equipment for positioning far-end interference base station | |
| CN102215534B (en) | Sub-frame configuration coordination approach and device thereof between a kind of TDD cell | |
| RU2016109982A (en) | COMMUNICATION CONTROL DEVICE, METHOD OF COMMUNICATION CONTROL, RADIO COMMUNICATION DEVICE AND METHOD OF RADIO COMMUNICATION | |
| CN105532049B (en) | For reducing the method and network entity of inter-network interference | |
| RU2013108778A (en) | PROVISION OF THE PHYSICAL DOWNLINE CONTROL CHANNEL (PDCCH) WITH THE FORMED DIRECTION DIAGRAM ON THE CARRIER EXTENSION OF THE MOBILE COMMUNICATION SYSTEM | |
| CN109644366B (en) | Communication method and base station | |
| US11930520B2 (en) | Interference management in wireless systems | |
| CN105406950A (en) | Device and method for wireless communication, electronic equipment, and method for electronic equipment | |
| US20170064722A1 (en) | Frequency planning in a distributed antenna system | |
| CN108632981A (en) | A kind of downlink synchronous signal sending method and method of reseptance and equipment | |
| EP3155837B1 (en) | Adaptive beacon transmission | |
| CN110768741B (en) | Interference analysis method and device | |
| US20090219977A1 (en) | Radio communication apparatus | |
| CN114205014B (en) | Cross time slot interference processing method, base station, device and medium | |
| KR20170065612A (en) | Weighted aggregation-based method and device for transmitting control signals | |
| CN111600687B (en) | Method and equipment for reducing interference | |
| CN104811255B (en) | A kind of antenna calibration method and device | |
| KR102192031B1 (en) | Communication method, network device and terminal device | |
| CN113973310A (en) | Method and device for optimizing remote co-channel interference and computer equipment | |
| CN103428717A (en) | Method, system and device for measuring configuring channel and uplink channel | |
| CN101686475A (en) | Disturbance detection method and disturbance detection equipment | |
| EP3346788B1 (en) | Resource allocation method and apparatus | |
| EP2999288B1 (en) | Component carrier allocation method and device, and computer storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |