Public mobile service radio frequency interference monitoring and judging method

Abstract

The invention discloses a public mobile service radio frequency interference monitoring and judging method, solves the problem that an existing radio frequency monitoring method is insufficient in judgment of interference history and interference results, and belongs to the technical field of radio monitoring and spectrum management. The method comprises the following steps: performing single-frequency-point frequency spectrum acquisition on a shared channel of two adjacent parties to obtain a channel frequency spectrum, measuring the shared channel while acquiring the frequency spectrum, and analyzing a downlink signal of a base station; drawing a curve that the signal spectrum exists or disappears in each time period along with the change of time according to the continuously obtained channel spectrum; and drawing a curve of the analysis result in each time period along with the change of time according to the analysis result of the downlink signal of the base station obtained in the corresponding time period, comparing the two curves with a unified time axis, and drawing a curve of the occupied history of the channel in each time period. According to the method, the channel application history can be completely backtracked, the real same-frequency history can be quickly captured, and interference judgment is realized.

Description

Technical Field

[0001] The invention relates to a method for monitoring and determining radio frequency interference of public mobile services, belonging to the technical field of radio monitoring and spectrum management. Background Art

[0002] In the context of the current rapid development of the economy and communications, the importance of radio spectrum resources has been increasingly recognized by all sectors, and the competition for spectrum resources among all parties has become increasingly fierce. The problem of spectrum resource grabbing in border areas has become more prominent. With the increasing frequency of radio use in border areas, the electromagnetic environment in border areas has become increasingly complex, and problems such as signal crossing and interference have become increasingly serious. The radio supervision task in border areas faces new challenges.

[0003] Public mobile services are the most commonly used services in border areas, and coordination of public mobile communication frequency bands is also an important part of frequency coordination between adjacent regions. In order to understand the competition situation of frequency use between the two sides and determine the implementation of the rules of the channels in use, it is necessary to carry out radio spectrum monitoring in border areas. Monitoring and analyzing the frequency use situation of public mobile services can find that there is a transit phenomenon in the services and related frequency bands commonly used by both parties in the same border area. If there is a narrow frequency band co-frequency phenomenon in the frequency bands that are used intensively by both parties, there is a possibility of potential interference between the services of both parties.

[0004] Telecom service users usually do not file complaints for short-term, covert interference that only exists on a certain channel and is not serious enough to affect user use, and related issues do not attract the attention of operators. However, from the perspective of spectrum resource management, such issues involve the protection of national resource rights and interests, and need to be given sufficient attention and corresponding monitoring and evidence collection methods should be in place.

[0005] Existing monitoring methods can detect common interference phenomena, but there are deficiencies in the determination of short-term, hidden interference history and interference results. Specifically, for the narrow-band co-frequency phenomenon in fiercely competitive frequency bands, it is impossible to query the channel usage history, and neither the start and end time of the co-frequency phenomenon can be grasped, nor can it be determined whether the co-frequency channel is normally reused or there is real interference, let alone the interfering party and the interfered party. As a result, there is a lack of effective evidence collection for the judgment results, and it is impossible to provide sufficient technical support information for bilateral coordination. Summary of the invention

[0006] In view of the problem that the existing radio frequency monitoring methods are insufficient in determining interference history and interference results, the present invention provides a method for monitoring and determining radio frequency interference for public mobile services.

[0007] A method for monitoring and determining radio frequency interference of public mobile services of the present invention comprises:

[0008] S1. Collect the single-frequency spectrum of the shared channel of the adjacent two parties to obtain the channel spectrum, measure the shared channel while collecting the spectrum, and parse out the base station downlink signal;

[0009] S2. Draw a time-level relationship curve based on the continuously obtained channel spectrum to indicate the presence or disappearance of the signal spectrum in each time period over time; draw a time-level relationship curve based on the base station downlink signal analysis result obtained in the corresponding time period to indicate the analysis result in each time period over time, including the analysis result being our signal, the analysis result being the neighboring signal, both signals being analyzed at the same time, or no analysis result; compare the time-level relationship curve with the time-level relationship curve with the time-signal user determination result relationship curve on the same time axis, and draw a time-channel status relationship curve; determine the channel occupancy history in each time period based on the time-channel status relationship curve.

[0010] Preferably, in S2, the channel status in the relationship curve between time and channel status includes: the channel status is normal and the channel is used by our party, the channel status is normal and the channel is used by the neighbor, there is interference in the channel, the channel status is normal and the channel is shared by both parties, and the channel is in an idle state.

[0011] Preferably, in S2, the occupancy history of the channel in each time period is determined according to a relationship curve between time and channel status:

[0012] If the signal spectrum exists in a certain time period and the analysis result is our signal, the corresponding time period of the relationship curve between time and channel status will show that the channel status is normal and the channel is used by us;

[0013] If the signal spectrum exists in a certain time period and the analysis result is a neighbor signal, the corresponding time period of the relationship curve between time and channel status shows that the channel status is normal and the channel is used by the neighbor;

[0014] If the signal spectrum exists in a certain time period and there is no analysis result, the corresponding time period of the relationship curve between time and channel status will show that the channel has interference;

[0015] If the signal spectrum exists in a certain time period and the two signals are solved at the same time, the corresponding time period of the relationship curve between time and channel status shows that the channel status is normal and shared by both parties;

[0016] If the signal spectrum disappears within a certain time period and there is no analysis result, the corresponding time period of the relationship curve between time and channel status will show that the channel is in an idle state.

[0017] Preferably, in S1, when performing single-frequency spectrum acquisition on the shared channel, the frequency band range is determined according to the channel sharing situation of both parties.

[0018] Preferably, in S1, a base station analysis device is used to analyze the base station downlink signal.

[0019] The beneficial effects of the present invention are as follows: the present invention can completely trace back the channel application history, quickly capture the true co-frequency history and realize interference judgment, even if it is short-term co-frequency and short-term interference; at the same time, whether the standards are the same and whether the frequency can be reused will affect the interference judgment. The situation is very complicated. The present invention can judge whether the channel is in a normal state only based on whether the base station analysis equipment can parse the base station downlink signal, without analyzing the channel reuse problem between different standards from the principle level of business standards, which simplifies the judgment and ensures accuracy; it provides evidence collection and evidence support information from the perspective of spectrum management, realizing operations that cannot be achieved from operators and traditional perspectives. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the determination principle of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0024] The method for monitoring and determining radio frequency interference for public mobile services in this embodiment mainly targets the following situations: there is real interference between two adjacent services, but the interference is short in duration, small in scale, low in degree, and highly concealed, and does not affect the use of the services. This embodiment is based on time synchronization, and realizes the determination of co-frequency interference between two adjacent public mobile services in border scenarios by comparing the monitoring data in the frequency domain and the analysis domain. The determination specifically refers to the use of the spectrum data and analysis data of a channel to determine whether interference has occurred in the channel within a period of time in the past. The method for monitoring and determining radio frequency interference for public mobile services in this embodiment:

[0025] Step 1: For the shared channels between the two sides with the possibility of interference in the border area between the two adjacent sides, implement long-term single-frequency spectrum acquisition. The acquisition bandwidth is determined according to the shared channel situation between the two sides and cannot be limited to the channel. It should be appropriately relaxed to grasp the background noise situation.

[0026] There are three situations for channel sharing: first, the services of the same standard on both sides share the same channel, and the intermediate frequencies overlap and the signal bandwidths are the same. This situation is relatively simple. Second, the services of the same (or different) standards on both sides have slightly offset intermediate frequencies, resulting in partial overlap of the channels of both sides. This situation is more common in services with larger signal bandwidths. Third, the services of both sides have different standards, party A has a larger signal bandwidth, and party B has a smaller signal bandwidth, and the latter's signal channel is included in the former's signal channel.

[0027] The differences in the above three situations will affect the frequency band range of spectrum acquisition. For the first situation, only the channel itself can be measured, acquired and analyzed; for the second and third situations, the frequency band range of measurement acquisition should be expanded.

[0028] Step 2: While collecting the spectrum, use the base station analysis equipment to measure the shared channel and store the data.

[0029] The difference in channel sharing and whether the standards are the same will also affect the frequency band range resolved by the base station. This implementation method only determines whether the channel is in a normal state based on whether the base station resolution device can resolve the base station downlink signal, without analyzing the channel multiplexing problem between different standards from the principle level of the service standard. In addition, the 5G service situation is relatively complicated and is not involved in this method for the time being.

[0030] Step 3: Use spectrum acquisition and base station analysis results to determine co-channel interference. Since both aspects of measurement and acquisition are only for a single or a small number of specific channels, the two types of data have strong continuity in time, and it is easy to find time points that can be associated with each other, so the two types of data can be used to make judgments more accurately.

[0031] To ensure accurate and reliable judgment, it is necessary to strictly synchronize the time of spectrum and analysis data to accurately capture alternating use and true frequency co-occurrence. The fundamental purpose and expected effect accuracy of this implementation method is to achieve qualitative analysis of channel occupancy history and interference problems and high-precision quantitative analysis, but it is not necessary to achieve extremely high-precision and complete tracing. Therefore, time synchronization under this goal is relatively easy to achieve under the condition of fewer measurement channels.

[0032] This method provides a judgment principle, that is, if the channel has spectrum (signal) at a certain moment, but no analytical data, it means that the channel is interfered at that moment. Because the presence of a signal means that the channel is in use, the absence of analytical data means that the base station downlink signal cannot be decoded by the device (naturally, the user's mobile phone cannot decode it either), which in turn comprehensively indicates that the service is interrupted. If the above situation is true from moment t1 to moment t2, it means that between the two moments, the channel is always in an interference state, and the service is continuously interrupted until it is restored at the next moment - there is both spectrum data and analytical data.

[0033] According to the determination principle, after the determination is completed, the channel occupancy history can be formed. The curve of this implementation method includes the following elements:

[0034] (1) Time axis (horizontal axis - timeline): The start and end time points of the collection of the two types of data are used as the beginning and end of the timeline, which is used to represent the time / event axis during which the channel is occupied by the services of both parties.

[0035] (2) Status axis (vertical axis - status line): When a channel is occupied by our party at a certain moment, a dot is placed in the first quadrant of the coordinate system composed of the time axis and the ownership axis; when the channel is occupied by the neighboring party, a dot is placed in the fourth quadrant. The points are connected into a line to form a status line, which is used to represent the occupation and ownership status of the channel along the time line.

[0036] (3) Status identification: Occupied by our side + Occupied by the neighboring side + Occupied channel with two demodulation results + Occupied channel but signal cannot be demodulated (interference) + Idle channel. The identification method of the latter three situations in the coordinate system is as follows:

[0037] a. In a shared state: The upper and lower points are highlighted but not connected. This means that the channel is shared by both parties at this moment and has no adverse effect on each other, and is in a normal shared state;

[0038] b. Interference exists: A vertical line (which can be highlighted in a special color) connecting the two points above and below runs through quadrants 1 and 4, indicating that the channel is affected by the signals sent by the two parties and causes interference;

[0039] c. Channel idle state: At the corresponding moment on the time axis, a hollow dot indicates that the channel is idle.

[0040] (4) Coordinate system display under different time dimensions. Due to the long acquisition time, the coordinate system under normal conditions can only show the channel occupancy situation in the whole period of time from a coarse time dimension, but cannot show the details. However, it will highlight the time period when interference occurs. For the time period with interference, it can be expanded and enlarged to show the more accurate channel attribution and the time point when interference occurs within the time range.

[0041] (5) The above coordinate system is actually generated by comparing two event lines.

[0042] This implementation method implements long-term narrowband situation monitoring for the selected frequency bands, and draws a time-level relationship curve based on the continuously obtained channel spectrum to represent the spectrum event line of the corresponding channel. It is used to characterize the change of the channel over time and the event process of the presence or disappearance of the signal spectrum in each time period.

[0043] For the selected channels (frequency bands), long-term narrowband analysis monitoring is implemented. According to the base station downlink signal analysis results obtained in the corresponding time period, a relationship curve between time and the signal user's determination result is drawn. This is the channel analysis event line, which is used to characterize the analysis results in each time period as time changes, including the analysis result being our signal, the analysis result being the neighbor's signal, both signals being resolved at the same time, or no analysis result. The relationship curve between time and level is compared with the relationship curve between time and the signal user's determination result on the same time axis, and a relationship curve between time and channel status is drawn. According to the relationship curve between time and channel status, the channel occupancy history in each time period is determined.

[0044] By comparing the two lines, we can draw the coordinate system. The schematic diagram of the determination principle is as follows:

[0045] The determination results obtained in this implementation can be broken down into the following five cases:

[0046] (1) If there is a signal in the spectrum within a certain time period and the analysis result is our signal (not the same frequency in this time period) - the channel status is normal and the signal is used by us;

[0047] (2) If there is a signal in the spectrum within a certain time period and the analysis result is a neighboring signal (not on the same frequency during this time period) - the channel status is normal and the signal is used by the neighbor;

[0048] (3) If there is a signal in the spectrum within a certain period of time and the analysis result is that it cannot be determined (same frequency and actual interference) - there is interference in the channel;

[0049] (4) If there is a signal in the spectrum within a certain time period and the analysis result is that both signals are analyzed at the same time (same frequency multiplexing without interference) - the channel status is normal and it can be determined who is using the channel;

[0050] (5) If there is no signal in the spectrum + no analysis judgment (channel idle) within a certain period of time, the channel is idle. For short-term and hidden interference that only exists on a certain channel, it is indeed worth paying attention to from the perspective of spectrum management and border coordination:

[0051] (1) For bilaterally coordinated channels, this type of tracing is similar to a form of supervision of the parties’ implementation of the bilateral agreement, to see whether the parties have used the coordinated channels in accordance with the agreement and what the specific application situation is;

[0052] (2) For common uncoordinated traffic channels, this type of tracing can provide the most direct results of transit interference determination and related evidence, and provide preliminary data, technical support or negotiation conditions for possible future coordination;

[0053] (3) For the business itself, it can detect hidden instantaneous or short-term interference, which is beneficial to improving the service level (short-term interference may cause disconnection, call interruption and other problems). On the other hand, it can also prevent problems from getting worse and take timely measures to prevent them from getting worse. If obvious interference really occurs in the future, it can also respond quickly.

[0054] (4) If this method can be used to trace back the channel occupation history, capture the interference moment and understand its pattern, it can provide a prediction reference for the occurrence of future interference. Once interference can be predicted, it will not only help solve the interference, but also capture the latest interference evidence in time to provide support for border frequency coordination.

[0055] Compared with the existing monitoring methods, this method can, firstly, completely trace back the channel application history; secondly, it can quickly capture the true co-frequency history and realize interference judgment, even if it is short-term co-frequency and short-term interference; thirdly, whether the standards are the same and whether the frequency can be reused will affect the interference judgment, and the situation is very complicated. This method can judge whether the channel is in a normal state only based on whether the base station analysis equipment can parse the base station downlink signal, without analyzing the channel reuse problem between different standards from the principle level of business standards, which simplifies the judgment and ensures accuracy; fourthly, it provides evidence collection and evidence support information from the perspective of spectrum management, realizing operations that cannot be achieved from operators and traditional perspectives.

[0056] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A method for monitoring and determining interference with radio frequencies of public mobile services, characterized in that: The method comprises: S1. Collect the single-frequency spectrum of the shared channel of the adjacent two parties to obtain the channel spectrum, measure the shared channel while collecting the spectrum, and parse out the base station downlink signal; S2. Draw a time-level relationship curve based on the continuously obtained channel spectrum to indicate the presence or disappearance of the signal spectrum in each time period over time; draw a time-level relationship curve based on the base station downlink signal analysis result obtained in the corresponding time period to indicate the analysis result in each time period over time, including the analysis result being our signal, the analysis result being the neighboring signal, both signals being analyzed at the same time, or no analysis result; compare the time-level relationship curve with the time-level relationship curve with the time-signal user determination result relationship curve on the same time axis, and draw a time-channel status relationship curve; determine the channel occupancy history in each time period based on the time-channel status relationship curve.

2. The method for monitoring and determining interference with radio frequency of public mobile services according to claim 1, characterized in that: In S2, the channel states in the relationship curve between time and channel state include: The channel status is normal and the channel is used by our party, the channel status is normal and the channel is used by the neighbor, the channel is interfered, the channel status is normal and the channel is shared by both parties, and the channel is idle.

3. The method for monitoring and determining interference with radio frequency of public mobile services according to claim 2, characterized in that: In S2, the channel occupancy history in each time period is determined according to the relationship curve between time and channel status: If the signal spectrum exists in a certain time period and the analysis result is our signal, the corresponding time period of the relationship curve between time and channel status will show that the channel status is normal and the channel is used by us; If the signal spectrum exists in a certain time period and the analysis result is a neighbor signal, the corresponding time period of the relationship curve between time and channel status shows that the channel status is normal and the channel is used by the neighbor; If the signal spectrum exists in a certain time period and there is no analysis result, the corresponding time period of the relationship curve between time and channel status will show that the channel is interfered; If the signal spectrum exists in a certain time period and the two signals are solved at the same time, the corresponding time period of the relationship curve between time and channel status shows that the channel status is normal and shared by both parties; If the signal spectrum disappears within a certain time period and there is no analysis result, the corresponding time period of the relationship curve between time and channel status will show that the channel is in an idle state.

4. The method for monitoring and determining interference with radio frequency of public mobile services according to claim 1, characterized in that: When single-frequency spectrum acquisition is performed on a shared channel in S1, the frequency band range is determined according to the channel sharing situation of both parties.

5. The method for monitoring and determining interference with radio frequency of public mobile services according to claim 1, characterized in that: In S1, the base station downlink signal is analyzed using the base station analysis equipment.

6. A computer-readable storage device storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for monitoring and determining interference with radio frequencies of public mobile services as claimed in any one of claims 1 to 5 are implemented.

7. A public mobile service radio frequency monitoring device, comprising a storage device, a processor, and a computer program stored in the storage device and executable on the processor, characterized in that: The processor executes the computer program to implement the steps of the method for monitoring and determining public mobile service radio frequency interference according to any one of claims 1 to 5.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for monitoring and determining interference with radio frequencies of public mobile services as claimed in any one of claims 1 to 5 are implemented.

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