CN109511125B - Method for identifying adjacent cell interference and different system interference in wireless network - Google Patents
Method for identifying adjacent cell interference and different system interference in wireless network Download PDFInfo
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- CN109511125B CN109511125B CN201811360516.1A CN201811360516A CN109511125B CN 109511125 B CN109511125 B CN 109511125B CN 201811360516 A CN201811360516 A CN 201811360516A CN 109511125 B CN109511125 B CN 109511125B
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- H—ELECTRICITY
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- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
Abstract
The invention provides a method for identifying adjacent cell interference and different system interference in a wireless network, which comprises the following steps: the current base station acquires a sub-band use map of the current base station and the interference condition of a sub-band at a region to be detected; judging whether the area is the edge area of the coverage area of the current base station, if so, requesting the neighbor base station by the current base station to send a neighbor base station sub-band use map to the current base station, and otherwise, identifying whether the inter-system interference exists; the neighbor base station acquires a neighbor base station sub-band use map and sends the neighbor base station sub-band use map to the current base station; and the current base station judges the type of the interference source according to the interference condition of each sub-band and the state of the interference condition in the sub-band use map of the current base station and the sub-band use map of the adjacent base station. The invention also provides an identification method when the area to be detected is not the edge area of the coverage area of the current base station. The method of the invention judges the adjacent cell interference and the inter-system interference through the interference situation obtained by the current base station and the information of the use map of each base station sub-band, and the like, and can effectively identify the type of the interference source.
Description
Technical Field
The invention belongs to the field of computing communication networks, and particularly relates to a method for identifying adjacent cell interference and inter-system interference in a wireless network.
Background
Due to the scarcity of wireless spectrum, there are currently multiple ways to allocate spectrum for wireless systems. One way to allocate the spectrum resources is to allocate the spectrum resources available to the target wireless system, while allowing other heterogeneous wireless systems to share the spectrum resources. At this time, potential interference sources of the target wireless system include: and adjacent cell interference or different system interference in the target system. For different interference source types (adjacent cell interference or inter-system interference), interference avoidance or spectrum sharing strategies adopted by a base station of a target system are different.
Taking the power wireless private network as an example, the national radio administration designates the 7MHz frequency bands of 223-. However, at the present stage, the use of the frequency band is very complicated, and the frequency band includes transmission signals of a plurality of heterogeneous wireless systems, which specifically includes: 230MHz data transfer radio, military communication, radio astronomy, etc. In addition, due to the multi-base station networking of the power wireless private network, a terminal or a base station in one cell faces the possible inter-system signal interference and also faces the co-system interference signals from the surrounding adjacent cells. Moreover, the use conditions of the multiple systems for different frequency points (or carriers) in the frequency band dynamically change along with time.
Interference management and spectrum sharing are important research subjects of wireless communication systems, and there are already some mature and effective technical solutions, which are described and analyzed below.
(1) Co-system interference management [3GPP TS 36.213, Access Network, Evolved Universal Radio Access Network (E-UTRAN), v15.0.0, Dec.2017 ], 3GPP TS 36.423, X2application protocol (X2AP), Evolved Universal Radio Access Network (E-UTRAN), v15.0.0, Dec.2017 ]. In an existing communication system, such as LTE/LTE-a, in order to improve spectrum utilization, reduce the influence of using the same Physical Resource Block (PRB) between adjacent cells on the signal reception quality of cell edge users, and particularly define related signaling for interference coordination between adjacent base stations. The method specifically comprises the following steps: overload Indicator (OI), High Interference Indicator (HII), and Relative Narrowband Transmit Power (RNTP). The OI and the HII are used for an uplink, and the OI identifies which users on physical resource blocks in the transmission bandwidth of the cell are seriously interfered; HII identifies which PRBs within the transmission bandwidth have been used and thus may cause high interference to neighbouring cells. RNTP is used for downlink and is used for indicating downlink power information of each PRB in transmission bandwidth, and adjacent cells carry out interference coordination according to the received RNTP power information, thereby reducing the interference between cells of the same system. However, these signaling are only used to characterize the signal quality at different PRB positions within the transmission bandwidth of the cell, and do not include the signal interference state of frequency points outside the transmission bandwidth.
(2) Inter-system interference management [ great university of Beijing post and telecommunications academic paper, spectrum sharing technology research in cognitive radio, 1 month and 17 days in 2013. And T.Xu, M.Zhang, T.ZHou, "Statistical Signal Transmission Technology: Novel perceptual for 5G Enabled Vehicular Networking," IEEE Wireless Communications, vol.24, No.6,2017, pp.22-29 ]. Cognitive radio is considered to be an effective way to address spectrum resource deficiencies. The cognitive user senses the surrounding wireless environment by using a radio technology, selects to access an idle channel, and improves the communication quality and reduces the interference to authorized users by dynamic spectrum switching. The main methods for spectrum sensing and spectrum decision include: judging the signal power threshold value, analyzing the statistical characteristics of the signal and the like. This technique, however, generally does not distinguish between the types of interference sources and does not interact between adjacent base stations.
(3) In engineering implementation, research and implementation of interference detection and classification between systems of heterogeneous interference sources [ the master academic paper of Beijing university of transportation, Van Wedi, TD-LTE ] are often analyzed by using a deterministic computational analysis method, a simulation method, a present network test method and the like. Year 2015, 3 months. ]. The first two methods are mainly used for the interference link budget between base stations and between terminals, and assist in network deployment. For deployed systems, existing network tests are usually employed to analyze the specific situation and the influence range of the interference and determine a solution. When the coexisting interference situation of the target system is complex, the engineering usually adopts a manual on-station interference investigation method to determine the type of an interference source and the generation reason so as to select a proper evasion scheme to solve the interference and ensure the normal work of the system. The above problems are generally solved by adjusting physical means such as base station spacing or physical antenna direction, and belong to basic means for avoiding and solving interference in the early stage of network deployment and operation, but instantaneous interference caused by dynamic factors such as user mobility, channel environment change or burst different system transmission in the network operation process cannot be solved.
In summary, in the current scenario where the same-system neighbor cell interference and the different-system interference exist at the same time, the existing interference management and spectrum sharing cannot effectively identify the interference state information of each sub-band in the full frequency band in the network operation process, and distinguish the type of the interference source. The full frequency band includes a frequency spectrum occupied by a used part of the sub-band and an unused part of the sub-band of the base station.
Considering that a wireless system usually adopts different interference management mechanisms and spectrum use strategies when dealing with adjacent cell interference and different system interference in the same system, for example, for a certain base station, a plurality of interference sources are adjacent cell interference, and in order to reduce interference to a terminal in the adjacent cell of the same system, the base station will actively reduce transmission power, or select a sub-band with low interference to the adjacent cell at an interfered area of the base station for transmission; if the interference source is the inter-system interference, it may choose to directly abandon the sub-band, or transmit the sub-band with a lower code rate and modulation mode to ensure the signal transmission quality of the sub-band. Therefore, effectively identifying the same-system neighbor cell interference and the different-system interference is the first problem to be solved by the wireless system.
Disclosure of Invention
The invention aims to provide a method for identifying adjacent cell interference and different system interference in a wireless network, so as to effectively identify the type of an interference source of each sub-band in a full frequency band.
The invention also provides a method for identifying adjacent cell interference and different system interference in a wireless network, which comprises the following steps:
s1: the current base station acquires the interference condition of the sub-band of the full frequency band C of the region to be detected, and acquires the use atlas U of the sub-band of the current base station of the full frequency band CA；
S2: if the area to be detected is judged to be the edge area of the coverage area of the current base station, the current base station requests the neighbor base station to use the neighbor base station sub-band using map UBSending to the current base station;
s3: the neighbor base station receives the current signal in S2Requesting by the base station to obtain the sub-band use map U of the adjacent base station of the full frequency band CBAnd sends it to the current base station;
s4: the current base station receives the sub-band use map U of the neighbor base stationBAccording to the interference situation of each sub-band obtained by the current base station and the use map U of each sub-band in the current base station sub-bandAUsage pattern U of sub-band of adjacent base stationBThe interference source type of the sub-band is judged according to the state in (1).
The step S4 of determining the types of interference sources received by the sub-bands includes: for each of the sub-bands, the sub-band,
if there is interference in this sub-band, then
If U isBIndicating that the adjacent base station does not use the sub-band, and judging that the sub-band only has the interference of the different systems;
if U isBIndicating the adjacent base station to use the sub-band, judging that the sub-band at least has adjacent interference, and further judging whether the interference source has inter-system interference by the current base station;
if the sub-band has no interference, then
If U isBIndicating that the adjacent base station does not use the sub-band, and judging that the sub-band is not interfered;
if U isBAnd indicating the adjacent cell base station to use the sub-band, and judging that the sub-band has no interference but has potential adjacent cell interference.
The current base station further judges whether the interference of the different system exists in the interference source by comparing the interference energy of the sub-band with a preset interference threshold value; if the interference is higher than the preset interference threshold, judging that the sub-band has inter-system interference besides the adjacent cell interference; otherwise, judging that the sub-band only has the adjacent cell interference.
Preferably, the interference threshold value is a normalized value greater than 0 and less than 1.
The interference condition of the sub-band of the full frequency band C in the area to be measured is obtained by periodic or aperiodic full frequency band scanning of the current base station, or by informing the current base station that the terminal corresponding to the area to be measured in the coverage area performs co-frequency or inter-frequency measurement and reporting the measurement result to the current base station.
Step S1 further includes determining whether interference exists in at least one sub-band in the region to be measured.
Preferably, the current base station sub-band uses a map UAThe method includes a plurality of status values respectively corresponding to the sub-bands in the full frequency band C, where each status value is 0 or 1, 0 indicates that the sub-band corresponding to the status value is not used in the coverage area of the current base station, and 1 indicates that the sub-band corresponding to the status value is used in the coverage area of the current base station.
In another preferred manner, the step S1 further includes numbering each sub-band on the full band C, and the current sub-band of the base station uses the map UADefined as the full number set of used subbands in the coverage area of the current base station.
In another aspect, the present invention provides a method for identifying neighboring cell interference and inter-system interference in a wireless network, including the following steps:
s1: the current base station acquires the interference condition of the sub-band of the full frequency band C of the region to be detected, and acquires the use atlas U of the sub-band of the current base station of the full frequency band CA；
S2: and if the area to be detected is judged not to be the edge area of the coverage area of the current base station, judging that the interference source of the sub-band with the interference is only the interference of the different system.
The interference condition of the sub-band of the full frequency band C in the area to be measured is obtained by periodic or aperiodic full frequency band scanning of the current base station, or by informing the current base station that the terminal corresponding to the area to be measured in the coverage area performs co-frequency or inter-frequency measurement and reporting the measurement result to the current base station.
Preferably, the current base station sub-band uses a map UAThe method includes a plurality of status values respectively corresponding to the sub-bands in the full frequency band C, where each status value is 0 or 1, 0 indicates that the sub-band corresponding to the status value is not used in the coverage area of the current base station, and 1 indicates that the sub-band corresponding to the status value is used in the coverage area of the current base station.
In another preferred manner, the step S1 further includes numbering each sub-band on the full band C, and the current sub-band of the base station uses the map UADefined as the full number set of used subbands in the coverage area of the current base station.
The method for identifying the adjacent cell interference and the inter-system interference in the wireless network comprehensively judges the adjacent cell interference and/or the inter-system interference through the interference condition of the current base station, the full-band current base station sub-band use map and whether the area to be detected is an edge area or not, or through the interference condition of the current base station, the full-band current base station sub-band use map, the adjacent base station sub-band use map and the interaction between the base stations, so that the current base station can effectively identify the interference source type of each sub-band in the full frequency band, and therefore, a targeted interference avoidance and frequency spectrum use strategy is adopted, and performance requirements such as frequency spectrum use efficiency and transmission reliability are considered at the same time.
Drawings
Fig. 1 is a diagram of an example of a spectrum of a full frequency band;
fig. 2 is a schematic diagram of a scenario in which the method for identifying neighboring cell interference and inter-system interference in a wireless network according to the present invention is applied;
fig. 3 is a flowchart illustrating a method for identifying neighboring cell interference and inter-system interference in a wireless network according to an embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The invention provides a method for identifying adjacent cell interference and different system interference in a wireless network, which is suitable for a scene that the same system adjacent cell interference and different system interference exist at the same time, namely in a certain geographic area, the interference classification comprises the following steps:
(1) no interference exists;
(2) only inter-system interference;
(3) only adjacent cell interference;
(4) there is also inter-system interference and adjacent cell interference.
Specifically, as shown in fig. 1, it is assumed that an available frequency band granted by a wireless transmission system (hereinafter referred to as a target system) is a full frequency band C, and the full frequency band C is C ═ C1+C2+C3(ii) a Simultaneously for each sub-band (C)1，C2，C3) And may be divided into several sub-bands (or called carrier wave and frequency point), and the target system may select at least 1 sub-band to transmit signals. In addition, the full band C may be a discrete spectrum. Multiple base stations within the target system may select the same or different subbands to transmit signals. Interference from neighboring cells may be experienced at the cell edge when the base stations of two neighboring cells choose to transmit using the same subbands. When different sub-band transmissions are selected, there is no interference from neighboring cells at the cell edge.
Because in the full frequency band C, multiple heterogeneous systems are allowed to share spectrum resources in manners of spectrum sensing, carrier aggregation, and the like, in an interference scenario to which the present invention is applied, when a target system is in any sub-band in the full frequency band C, it is necessary to consider interference from neighboring cells in the same system (hereinafter, referred to as neighboring cell interference) and bursty interference of other heterogeneous systems in the same frequency band. Taking a working scenario of 2 base stations in a target system as an example, as shown in fig. 2, which is an interference scenario applicable to the method for identifying interference between neighboring cells and interference between different systems in a wireless network according to the present invention, a current base station a is subjected to two different systems (H) from within a coverage area of a current cell1，H2) Is received by the inter-system (H) from within the coverage area of the cell1，H3) Potential interference of (2); meanwhile, if base stations a and B use the same subband, a terminal user in a coverage overlapping area (hereinafter referred to as a cell edge area) of two base stations may also be interfered by a neighboring cell. It should be noted that, in fig. 2, the interference suffered by the base station a and the base station B is the adjacent cell interference and the interference from the different system H1And (4) superposition of interference signals.
Fig. 3 shows a method for identifying neighboring cell interference and inter-system interference in a wireless network according to an embodiment of the present invention, which specifically includes the following steps:
step S1: the current base station A acquires the interference condition of the sub-band of the full frequency band C of the region to be detected, and acquires the use atlas U of the sub-band of the current base station of the full frequency band CAWherein, there is an X2 interface between the base stations, specially used for the information interaction between the base stations;
the interference condition of the sub-band of the full frequency band C in the area to be measured may be obtained by periodic or aperiodic full frequency band scanning of the current base station a, or may be obtained by notifying the current base station a that the terminal corresponding to the area to be measured performs co-frequency or inter-frequency measurement in the coverage area thereof and reporting the measurement result to the current base station a.
In this embodiment, the current base station sub-band uses the atlas UAThe method includes a plurality of status values respectively corresponding to the sub-bands in the full frequency band C, where each status value is 0 or 1, 0 indicates that the sub-band corresponding to the status value is not used in the coverage area of the current base station a, and 1 indicates that the sub-band corresponding to the status value is used in the coverage area of the current base station a. In addition, the current base station sub-band uses the atlas UAOther representations may also be used, for example, step S1 may further include numbering each sub-band on the full band C, and the current base station sub-band uses the map UADefined as the full numbered set of used subbands in the coverage area of the current base station a.
In addition, the step S1 further includes determining whether interference exists in at least one sub-band in the region to be measured. If so, the interference exists in the area to be detected, and the step S2 is continued; otherwise, the interference does not exist in the area to be detected, and the method for identifying the adjacent cell interference and the inter-system interference in the wireless network is finished.
Step S2: judging whether the area to be detected is the edge area of the coverage area of the current base station A; if: if the area to be detected is judged to be the edge area of the coverage area of the current base station A, which indicates that the type of the interference source needs to be identified, the current base station A sends request information to the adjacent base station B to request the adjacent base station B to use the sub-band use map of the adjacent base stationUBSending the information to the current base station A, and continuing to perform the step S3; if the area to be detected is judged not to be the edge area of the coverage area of the current base station A, the interference source of the sub-band with the interference is judged to be only the interference of the different system, and the sub-band without the interference is judged to be the interference of the sub-band, so that the method for identifying the interference of the adjacent area and the interference of the different system in the wireless network is completed.
In this embodiment, the subband use map U of the neighbor base stationBUsing atlas U with current base station sub-bandAAre shown in a consistent manner.
Step S3: the neighbor base station B receives the request information of the current base station A and acquires a neighbor base station sub-band use map U of the full band CBAnd sends it to the current base station A;
step S4: current base station A receiving adjacent zone base station sub-band using atlas UBAnd according to the interference situation of each sub-band obtained by the current base station A and the use map U of each sub-band in the current base station sub-bandAUsage pattern U of sub-band of adjacent base stationBThe interference source types of the sub-band are judged one by one according to the state in (1).
For each sub-band, if there is interference for that sub-band:
1) if U isBIndicating that the adjacent cell base station B does not use the sub-band, and judging that the sub-band only has the inter-system interference;
2) if U isBAnd indicating the adjacent cell base station B to use the sub-band, judging that the sub-band at least has adjacent cell interference, and further judging whether the interference source has inter-system interference by the current base station A.
The current base station a further determines whether there is inter-system interference in the interference source by comparing the interference energy of the sub-band with a preset interference threshold, and if the interference energy of the sub-band is higher than the preset interference threshold, determines that there is inter-system interference in the sub-band in addition to the neighboring cell interference; otherwise, judging that the sub-band only has the adjacent cell interference. The interference threshold value may be a normalized value greater than 0 and less than 1, or may be other positive real numbers.
If the sub-band has no interference, then
If U isBAnd indicating that the adjacent base station B does not use the sub-band, and judging that the sub-band is not interfered.
If U isBAnd indicating the adjacent cell base station B to use the sub-band, and judging that the sub-band has no interference but has potential adjacent cell interference. The existence of the interference of the adjacent region represents that the current time is not interfered, but due to the dynamic change characteristic of the environment/users, the interference exists at the next time with a certain probability. Therefore, the potential interference is judged to be available for properly reducing the priority of the frequency band with the potential interference when the subsequent frequency band is scheduled.
Simulation results
Taking the power wireless system as an example, the available full frequency bands C of the power wireless network are 223-226MHz and 229-233 MHz. The users in the frequency band comprise: the base station and the terminal of the power wireless network, a data transmission radio station, military communication, astronomical radio and the like. With the power wireless network as a target system, potential interference sources of a target system base station include: a neighboring base station in the target system (bringing neighboring interference) or an inter-system interference source (bringing inter-system interference such as a data transmission radio station, military communication or astronomical radio, etc.). The single sub-band bandwidth of the power wireless network is 25kHz, so that a total of 280 usable sub-bands exist in the full frequency band C.
According to step S1, the acquired current base station sub-band usage pattern U of the full band CAThe sequence of 280 bits, each bit corresponds to the subband use status of 280 subbands, a bit value of 0 indicates that the subband is not used, and a bit value of 1 indicates that the subband is used.
Acquired current base station sub-band usage pattern UAThe following were used:
i.e., base station a uses the first 10 subbands and does not use the remaining subbands.
The base station A acquires the interference condition of the sub-band of the full frequency band C of the region to be detected, and judges that at least one sub-band (or the sub-band used by the base station A or the sub-band not used by the base station A) of the region to be detected has interference. Suppose the interfered subbands are numbered 1, 3, 5, 25.
According to the step S2, the area to be measured is judged to be the edge area of the coverage area of the current base station A, and then the usage map U of the sub-band of the adjacent base station obtained according to the steps S3 and S4BThe following were used:
that is, the neighboring base station B uses 1 st, 3 rd, 5 th, 7 th, 9 th, 11 th, and 280 th subbands, and does not use the remaining subbands.
According to step S4: base station A receives adjacent base station sub-band use map UBAnd according to the interference source type received by each sub-band, obtaining:
for the sub-bands 1, 3 and 5, if the base station B is used, it is determined that the sub-bands 1, 3 and 5 have at least adjacent cell interference, and the current base station a further determines whether there is inter-system interference in the interference source.
Assuming that the interference energy of the sub-bands 1, 3 and 5 is 0.4, 0.6, 0.8 and 0.9 respectively, and the preset interference threshold value is 0.5, because the interference energy of the sub-bands 3 and 5 is higher than the preset threshold value, it is determined that the sub-bands 3 and 5 have inter-system interference in addition to the adjacent cell interference; subband 1 and neighbor interference only.
For sub-bands 12-279, base station B is not used, and for some sub-bands with interference, the sub-bands are judged to have only the interference of the different systems; otherwise, judging the sub-band is not interfered. For example, if there is interference in the sub-band 25 but the base station B is not in use, it is determined that there is interference in the sub-band 25.
If there is no interference in subbands 7 and 9, but base station B is used, it is determined that there is potential neighbor interference in subbands 7 and 9.
If the sub-band 280 has no interference, and the base station B uses the sub-band, it is determined that the sub-band 280 has potential neighbor interference.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (4)
1. A method for identifying adjacent cell interference and inter-system interference in a wireless network is characterized by comprising the following steps:
step S1: the current base station (A) acquires the interference condition of the sub-band of the full frequency band C in the region to be detected, and acquires the sub-band use atlas U of the current base station of the full frequency band CA；
The interference condition of the sub-band of the full frequency band C at the region to be measured is obtained by informing a terminal corresponding to the region to be measured in the coverage area of the current base station (A) to measure the same frequency or different frequency and reporting the measurement result to the current base station (A);
the sub-band usage pattern U of the current base stationAThe method comprises the steps that a plurality of state values respectively corresponding to all sub-bands on a frequency band C are included, each state value is 0 or 1, 0 represents that the sub-band corresponding to the state value is not used in the coverage area of the current base station (A), and 1 represents that the sub-band corresponding to the state value is used in the coverage area of the current base station (A);
step S2: if the area to be detected is judged to be the edge area of the coverage area of the current base station (A), the current base station (A) requests the neighbor base station (B) to use the sub-band of the neighbor base station with the map UBTo the current base station (A); sub-band usage pattern U of adjacent base stationBSub-band usage pattern U with current base stationAThe representation modes of (A) are consistent;
step S3: the adjacent base station (B) receives the request of the current base station (A) in the S2, and obtains a sub-band use map U of the adjacent base station of the full frequency band CBAnd sends it to the current base station (a);
step S4: the current base station (A) receives the sub-band use map U of the neighbor base stationBAccording to the interfered condition of each sub-band and the sub-band use map U of each sub-band at the current base stationASub-band use map U of adjacent base stationBThe interference source type of the sub-band is judged according to the state in (1).
2. The method for identifying neighboring cell interference and inter-system interference in a wireless network according to claim 1, wherein the determining the type of the interference source received by the sub-band in step S4 includes: for each of the sub-bands, the sub-band,
if there is interference in this sub-band, then
If U isBIndicating that the adjacent cell base station (B) does not use the sub-band, and judging that the sub-band only has the interference of the different systems;
if U isBIndicating the adjacent base station (B) to use the sub-band, judging that the sub-band at least has adjacent interference, and further judging whether the interference source has inter-system interference by the current base station (A);
if the sub-band has no interference, then
If U isBIndicating that the adjacent base station (B) does not use the sub-band, and judging that the sub-band is not interfered;
if U isBAnd indicating the adjacent cell base station (B) to use the sub-band, and judging that the sub-band has no interference but has potential adjacent cell interference.
3. The method for identifying neighboring cell interference and inter-system interference in a wireless network according to claim 2, wherein the current base station (a) further determines whether inter-system interference exists in the interference source by comparing the interference energy of the sub-band with a preset interference threshold; if the interference is higher than the preset interference threshold, judging that the sub-band has inter-system interference besides the adjacent cell interference; otherwise, judging that the sub-band only has the adjacent cell interference.
4. The method of claim 1, wherein the step S1 further includes determining whether interference exists in at least one sub-band in the area to be tested.
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