Interference isolation calculation method, device, computer equipment and storage medium

Abstract

The present application relates to a method, device, computer equipment, storage medium and computer program product for measuring interference isolation. The method obtains the access frequency band of the system to be accessed and the current system; extracts multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain the signal reception interference indicator, the noise interference indicator and the frequency interference indicator; calculates the interference isolation separately according to the signal reception interference indicator, the noise interference indicator and the frequency interference indicator to obtain the first interference isolation, the second interference isolation and the third interference isolation; compares the first interference isolation, the second interference isolation and the third interference isolation, and determines the interference isolation according to the comparison result. The overall solution determines the interference indicators that affect the system isolation through three dimensions, calculates three interference isolations according to the interference indicators of the three dimensions and conducts a comprehensive analysis to obtain a more accurate interference isolation.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an isolation measurement method, device, computer equipment, storage medium and computer program product. Background Art

[0002] With the rapid development of communication technology, the civil communication coverage of subway lines in the early stage of construction generally adopts 2G / 3G system, and a few POI (Point Of Interface) reserve 4G access conditions. Some lines are built by subway companies, and there are cases where civil communication systems and private network PIS (Passenger Information System) systems are built on the same cable.

[0003] Due to previous technical limitations, as well as the failure to consider subsequent 4G / 5G transformation and the interference between the subsequent frequency bands and the private network PIS system, the isolation between the systems in the POI is generally inaccurate and has large errors. Summary of the invention

[0004] Based on this, it is necessary to provide an interference isolation measurement method, device, computer equipment, computer-readable storage medium and computer program product that can achieve accurate interference isolation measurement in response to the above technical problems.

[0005] In a first aspect, the present application provides a method for measuring interference isolation. The method comprises:

[0006] Obtain the access frequency band of the system to be accessed and the access frequency band of the current system;

[0007] Extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain signal reception interference indicators, noise interference indicators and frequency interference indicators;

[0008] According to the signal reception interference index, the noise interference index and the frequency interference index, interference isolation is calculated separately to obtain a first interference isolation, a second interference isolation and a third interference isolation;

[0009] The first interference isolation degree, the second interference isolation degree, and the third interference isolation degree are compared, and the interference isolation degree is determined according to the comparison result.

[0010] In one embodiment, the signal reception interference index includes a blocking level index of the receiver and an output power of an interference transmitter; calculating according to the signal reception interference index to obtain a first interference isolation degree includes: calculating a difference between the blocking level index and the output power of the interference transmitter to obtain the first interference isolation degree.

[0011] In one embodiment, the noise interference index includes a spurious radiation level, thermal noise in a receiving band of an interfered system, and a noise coefficient of a receiver; calculating according to the noise interference index to obtain a second interference isolation includes: performing a difference calculation according to the spurious radiation level, thermal noise in a receiving band of an interfered system, and a noise coefficient of a receiver to obtain a second interference isolation.

[0012] In one of the embodiments, the spurious radiation level is calculated by using the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system.

[0013] In one embodiment, the frequency interference index includes the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner; calculating according to the frequency interference index to obtain the third interference isolation includes: calculating according to the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner to obtain the third interference isolation.

[0014] In one embodiment, the first interference isolation, the second interference isolation and the third interference isolation are compared, and determining the interference isolation according to the comparison result includes: selecting the maximum isolation among the first interference isolation, the second interference isolation and the third interference isolation to obtain a target interference isolation.

[0015] In a second aspect, the present application also provides an interference isolation degree measurement device. The device comprises:

[0016] An acquisition module, used to acquire an access frequency band of a system to be accessed and an access frequency band of an existing system;

[0017] An extraction module is used to extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain a signal reception interference indicator, a noise interference indicator and a frequency interference indicator;

[0018] A calculation module, used to calculate interference isolation separately according to the signal reception interference index, the noise interference index and the frequency interference index, to obtain a first interference isolation, a second interference isolation and a third interference isolation;

[0019] The comparison module is used to compare the first interference isolation degree, the second interference isolation degree and the third interference isolation degree, and determine the interference isolation degree according to the comparison result.

[0020] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0021] Obtain the access frequency band of the system to be accessed and the access frequency band of the current system;

[0022] Extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain signal reception interference indicators, noise interference indicators and frequency interference indicators;

[0023] According to the signal reception interference index, the noise interference index and the frequency interference index, interference isolation is calculated separately to obtain a first interference isolation, a second interference isolation and a third interference isolation;

[0024] The first interference isolation degree, the second interference isolation degree, and the third interference isolation degree are compared, and the interference isolation degree is determined according to the comparison result.

[0025] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0026] Obtain the access frequency band of the system to be accessed and the access frequency band of the current system;

[0027] Extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain signal reception interference indicators, noise interference indicators and frequency interference indicators;

[0028] According to the signal reception interference index, the noise interference index and the frequency interference index, interference isolation is calculated separately to obtain a first interference isolation, a second interference isolation and a third interference isolation;

[0029] The first interference isolation degree, the second interference isolation degree, and the third interference isolation degree are compared, and the interference isolation degree is determined according to the comparison result.

[0030] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0031] Obtain the access frequency band of the system to be accessed and the access frequency band of the current system;

[0032] Extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain signal reception interference indicators, noise interference indicators and frequency interference indicators;

[0033] According to the signal reception interference index, the noise interference index and the frequency interference index, interference isolation is calculated separately to obtain a first interference isolation, a second interference isolation and a third interference isolation;

[0034] The first interference isolation degree, the second interference isolation degree, and the third interference isolation degree are compared, and the interference isolation degree is determined according to the comparison result.

[0035] The above-mentioned interference isolation calculation method, device, computer equipment, storage medium and computer program product obtain the access frequency band of the system to be accessed and the access frequency band of the current system; extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain the signal reception interference index, noise interference index and frequency interference index; calculate the interference isolation separately according to the signal reception interference index, noise interference index and frequency interference index to obtain the first interference isolation, the second interference isolation and the third interference isolation; compare the first interference isolation, the second interference isolation and the third interference isolation, and determine the interference isolation according to the comparison result. The overall solution determines the interference indicators that affect the system isolation through three dimensions, and calculates the first interference isolation, the second interference isolation and the third interference isolation that affect the system isolation according to the interference indicators of the three dimensions, and conducts a comprehensive analysis based on the interference isolation calculated in the three dimensions, so as to determine a more accurate interference isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 An application environment diagram of an interference isolation degree measurement method in an embodiment;

[0037] Figure 2 A schematic diagram of a flow chart of a method for calculating interference isolation in one embodiment;

[0038] Figure 3 A schematic diagram of a flow chart of interference isolation degree measurement steps in one embodiment;

[0039] Figure 4 It is a structural block diagram of an interference isolation degree measuring device in one embodiment;

[0040] Figure 5 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] As an important means of transportation with high speed, convenience and wide connection range, subway has increasingly become the preferred mode of travel for the public. Due to the particularity of subway construction, civil communication construction is completed in one go, and later transformation is difficult. Previously built and operated subway lines basically had no 4G system when they were built. When civil communications were constructed on some lines, civil communication systems and dedicated PIS1800 (Passenger Information System, a service system that provides passengers with various information in the subway, including train control system and passenger information system) systems were co-built. With the rapid development of mobile phones, the civil communication system coverage of the early lines can no longer meet user needs. With the arrival of the 5G construction period, 4G / 5G transformation is imperative for special environments such as subways with high passenger flow and large burst data capacity.

[0043] The original dual-channel leaky cable system had a large interference problem after the introduction of 4G / 5G transformation. Due to the technical limitations at the time, the interference isolation settings between the systems in the POI (Point Of Interface) were not carefully measured and simulated, and were generally inaccurate with large errors. The subsequent 4G / 5G transformation and the subsequent introduction of interference between the frequency band and the private network PIS system were not considered, which greatly increased the difficulty of the transformation. Therefore, it is necessary to solve how to determine the appropriate isolation suppression in the POI where many systems are introduced to reduce the interference between systems.

[0044] In the cable-sharing environment of civil communication systems and private network PIS systems, the interference problems between systems are mainly caused by three interference factors: blocking interference, spurious interference and intermodulation interference, and the causes of interference are different. Blocking interference refers to when a strong interfering RF signal outside the frequency band enters the receiver at the same time as a useful RF signal within the frequency band, causing the receiver to suddenly enter the saturation zone, resulting in nonlinear distortion, which can cause severe blocking of the received signal; spurious interference refers to the out-of-band noise emitted by the interfering device falling into the receiving band of the interfered receiver, causing interference to the useful signal; intermodulation interference refers to the interference caused by the new frequency generated by the interaction between frequencies when two or more different frequencies act on a nonlinear circuit or device and fall into the frequency band of the receiver. Although the principles of the three interference methods are different, they can all reduce interference to an ideal level by improving the interference isolation between systems. The focus of this application is to solve how to effectively improve the interference isolation between mutually continuous frequency bands after the introduction of 4G / 5G transformation. When mutually continuous systems coexist in the same antenna feed system, it is very easy for one of the systems to be seriously interfered with. It is necessary to accurately measure the interference isolation of systems with mutually continuous frequency bands and calculate the optimal critical value of interference isolation from a theoretical perspective (to reduce interference to an ideal level).

[0045] The interference isolation degree calculation method provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. The data storage system can store the access frequency band data of each communication system. The terminal 102 sends a measurement request to the server 104, and the measurement request carries the access frequency band of the system to be accessed and the access frequency band of the current system. The server 104 receives the measurement request, parses the measurement request, obtains the access frequency band of the system to be accessed and the access frequency band of the current system; extracts multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system, and obtains the signal reception interference index, the noise interference index, and the frequency interference index; calculates the interference isolation separately according to the signal reception interference index, the noise interference index, and the frequency interference index, and obtains the first interference isolation, the second interference isolation, and the third interference isolation; compares the first interference isolation, the second interference isolation, and the third interference isolation, and determines the interference isolation according to the comparison result. The terminal 102 may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. The IoT devices may be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers.

[0046] In one embodiment, Figure 2 As shown, a method for measuring interference isolation is provided, and the method is applied to Figure 1 The server in the example is used to illustrate the following steps:

[0047] Step 202: Acquire the access frequency band of the system to be accessed and the access frequency band of the current system.

[0048] Among them, the system to be accessed refers to the communication system to be accessed, which can be a 4G system, a 5G system NR (5G New Radio) system, and the current system refers to the communication system currently accessed in the subway, which can be a private network PIS (Passenger Information System) system, or other current systems, which are not limited in this embodiment.

[0049] Specifically, the server obtains the identifier of the system to be accessed and the identifier of the current system, and obtains the access frequency band of the system to be accessed and the access frequency band of the current system corresponding to the identifier of the system to be accessed and the identifier of the current system from the server memory according to the identifier of the system to be accessed and the identifier of the current system. The system identifier can be the network standard of the communication system, such as the GSM900 (Global System for Mobile Communications) network standard, DCS1800 (Digital Cellular System at 1800MHz, 1800MHz digital cellular system) / LTE FDD (Long Term Evolution, long-term evolution technology) network standard, etc. The access frequency band of the system is determined by the system standards promulgated by the Ministry of Industry and Information Technology.

[0050] At present, there are many frequency bands for access by existing network operators, and there are situations where multiple system frequency bands are continuously accessed, such as the China Mobile 1800 system, China Unicom 1800 system, China Telecom 1800 system and private network PIS1800 system are simultaneously accessed to the same antenna feeder route. When conducting isolation studies, special attention should be paid to interference suppression between 1800 frequency bands. The specific access frequency bands are shown in the following table:

[0051] Table 1 Frequency bands for each system

[0052]

[0053] Step 204 , extracting multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system, and obtaining a signal reception interference indicator, a noise interference indicator, and a frequency interference indicator.

[0054] Among them, the interference index refers to various indicators that affect the communication signal in the system access frequency band. The values ​​of the interference index of systems with different access frequency bands may be different. The interference index data is stored in the interference database, and the corresponding interference index data can be obtained through the access frequency band of each system. After signal interference analysis, the interference between different systems is mainly divided into blocking interference, stray interference, intermodulation interference, etc., and the causes of interference are different. Among them, intermodulation interference is mainly third-order intermodulation interference, the interference factor causing blocking interference is signal reception interference, the interference factor causing stray interference is noise interference, and the interference factor causing intermodulation interference is frequency interference. Therefore, the interference isolation research of this application is mainly measured from these three dimensions.

[0055] Specifically, the server obtains corresponding interference indicators based on the access frequency band of the system to be accessed and the access frequency band of the current system, and obtains the signal reception interference indicator, noise interference indicator, and frequency interference indicator corresponding to the access frequency band of the system to be accessed and the access frequency band of the current system from the interference indicators from three dimensions: signal reception interference, noise interference, and frequency interference.

[0056] Step 206 , performing interference isolation calculations separately according to the signal reception interference index, the noise interference index, and the frequency interference index to obtain a first interference isolation, a second interference isolation, and a third interference isolation.

[0057] The first interference isolation degree may be a blocking interference isolation degree, the second interference isolation degree may be a stray interference isolation degree, and the third interference isolation degree may be an intermodulation interference isolation degree.

[0058] Specifically, the server calculates interference isolation according to the signal reception interference index to obtain a first interference isolation, calculates interference isolation according to the noise interference index to obtain a second interference isolation, and calculates interference isolation according to the frequency interference index to obtain a third interference isolation.

[0059] Step 208: compare the first interference isolation, the second interference isolation, and the third interference isolation, and determine the interference isolation according to the comparison result.

[0060] Specifically, the server compares the calculated first interference isolation degree, the second interference isolation degree, and the third interference isolation degree to obtain a comparison result, and determines the interference isolation degree according to the comparison result.

[0061] In the above interference isolation calculation method, the access frequency band of the system to be accessed and the access frequency band of the current system are obtained; multi-dimensional interference indicators are extracted according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain the signal reception interference indicator, the noise interference indicator, and the frequency interference indicator; interference isolation is calculated separately according to the signal reception interference indicator, the noise interference indicator, and the frequency interference indicator to obtain the first interference isolation, the second interference isolation, and the third interference isolation; the first interference isolation, the second interference isolation, and the third interference isolation are compared, and the interference isolation is determined according to the comparison result. The overall solution determines the interference indicators that affect the system isolation through three dimensions, and calculates the first interference isolation, the second interference isolation, and the third interference isolation that affect the system isolation according to the interference indicators of the three dimensions, and conducts a comprehensive analysis based on the interference isolation calculated in the three dimensions, so as to determine a more accurate interference isolation.

[0062] In one embodiment, calculating according to the signal reception interference index to obtain the first interference isolation includes: calculating the difference according to the blocking level index and the output power of the interference transmitter to obtain the first interference isolation.

[0063] Among them, the interference factor that causes blocking interference is signal reception interference. The signal reception interference index includes the blocking level index of the receiver and the output power of the interference transmitter. Blocking interference means that when the strong interference RF signal outside the frequency band enters the receiver at the same time as the useful RF signal within the frequency band, the receiver suddenly enters the saturation area, resulting in nonlinear distortion, which may cause the reception signal to be blocked in severe cases.

[0064] Specifically, the server obtains the blocking level index of the receiver and the output power of the interference transmitter from the interference database. The blocking level index of the receiver is determined by the approval issued by the Ministry of Industry and Information Technology and the relevant standards of 3GPP. The blocking level index is the reception limit requirement for the uplink of the frequency band and is a fixed value. The output power of the interference transmitter is determined by the approval issued by the Ministry of Industry and Information Technology and the interference transmitter power limit in the relevant standards of 3GPP. The blocking level index of the receiver and the output power of the interference transmitter are input into the blocking interference expression, and the difference between the output power of the interference transmitter and the blocking level index is calculated to obtain the blocking interference isolation.

[0065] The blocking interference expression is as follows: MCL1≥Po-Pb, where MCL1 is the blocking interference isolation, Po is the output power of the interference transmitter, and Pb is the blocking level index of the receiver.

[0066] Furthermore, combined with the blocking level indicators and interference transmitter power limits of each frequency band in the system standards issued by the Ministry of Industry and Information Technology and the relevant 3GPP standards, and considering the coexistence scenario of the civil communication 1800M system and the PIS system, the optimal isolation requirements for blocking interference are calculated as follows:

[0067] Table 2 Requirements for blocking interference isolation between systems

[0068]

[0069] In an optional embodiment, calculating according to the noise interference index to obtain the second interference isolation includes: performing difference calculation according to the spurious radiation level, the thermal noise in the receiving band of the interfered system and the noise coefficient of the receiver to obtain the second interference isolation.

[0070] Among them, the interference factor that causes spurious interference is noise interference, and the noise interference indicators include spurious radiation level, thermal noise in the receiving band of the interfered system, and noise factor of the receiver. Spurious interference refers to the out-of-band noise emitted by the interfering equipment falling into the receiving band of the interfered receiver, forming interference with the useful signal.

[0071] Specifically, the server obtains the spurious radiation level, the receiving band thermal noise of the interfered system, and the noise factor of the receiver from the interference database. The receiving band thermal noise of the interfered system and the noise factor of the receiver are determined by the "2100M Band 5G Mobile Communication System Base Station Radio Frequency Technical Requirements" issued by the Ministry of Industry and Information Technology.

[0072] The spurious radiation level, the thermal noise in the receiving band of the interfered system and the noise factor of the receiver are input into the spurious interference expression, the difference between the spurious radiation level and the thermal noise in the receiving band of the interfered system and the noise factor of the receiver is calculated, and the difference is added to the preset noise value to obtain the spurious interference isolation.

[0073] The expression of spurious interference is as follows:

[0074] MCL2≥W-Pn-Nf+6.9, where MCL2 is the spurious interference isolation, Pn is the thermal noise in the receiving band of the interfered system, expressed in dBm, Nf is the noise factor of the receiver. The receiver noise factor of the base station generally does not exceed 5dB, and 6.9 is the preset noise value.

[0075] For example, based on the "2100M Band 5G Mobile Communication System Base Station Radio Frequency Technical Requirements" issued by the Ministry of Industry and Information Technology, taking the spurious indicators of the 2100M system within the GSM900 system channel range as an example:

[0076] In the coexistence (co-leakage cable) scenario, the spurious emission level limit of the 2100M system in the 885-915 frequency band is -61dBm, and the interference level measurement bandwidth is 100kHz. The calculation method of the interfered system thermal noise is: Pn = -174 + 10*log (B), B is the receiver operating bandwidth of the interfered system, taking GSM900 as an example, B is 26000000Hz, and the spurious interference isolation calculation formula shows that the 2100M 5G system is 48dB isolated from the GSM900 system.

[0077] Combined with the spurious emission limits, interference level measurement bandwidth, thermal noise and other indicators of each system standard and frequency band issued by the Ministry of Industry and Information Technology, referring to the spurious interference isolation calculation formula, and considering the coexistence scenario of the civil communication 1800M system and the PIS system, the optimal spurious interference isolation requirements are calculated as follows:

[0078] Table 3 Requirements for spurious interference isolation between systems

[0079]

[0080] In an optional embodiment, the spurious radiation level is calculated by using the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system.

[0081] Specifically, the server obtains the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system in the interference database, inputs the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system into the spurious radiation level expression, calculates the ratio of the measurement bandwidth of the interference level to the channel bandwidth of the interfered system, calculates the logarithm of the ratio, multiplies the logarithm by the preset ratio to obtain the product of the logarithms, and finally calculates the ratio of the spurious radiation level of the interfering base station to the product of the logarithms to obtain the spurious radiation level. The spurious radiation level expression is as follows:

[0082] W = Pspu-10Log(WInterfering / WAffected), where W represents the spurious radiation level, Pspu is the spurious radiation level of the interfering base station, in dBm, WInterfering is the measurement bandwidth of the interference level, in kHz, and WAffected is the channel bandwidth of the interfered system, in kHz. Therefore, the complete spurious interference expression is MCL2≥Pspu-10Log(WInterfering / WAffected)-Pn-Nf+6.9.

[0083] In an optional embodiment, calculating according to the frequency interference index to obtain the third interference isolation includes: calculating according to the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner to obtain the third interference isolation.

[0084] Among them, the interference factor causing intermodulation interference is frequency interference, and the frequency interference index includes the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interference system and the intermodulation index of the combiner. Intermodulation interference refers to the interference caused by the new frequency generated by the interaction between the frequencies falling into the frequency band of the receiver when two or more different frequencies act on a nonlinear circuit or device. Intermodulation interference is mainly third-order intermodulation interference, so the signal level of the interfering system causing intermodulation interference studied in this embodiment is at least three, that is, there are at least three signal levels of the interfering system.

[0085] Specifically, the server obtains the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interference system 1, the signal level of the interference system 2, the signal level of the interference system 3, and the intermodulation index of the combiner from the interference database, and inputs the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interference system 1, the signal level of the interference system 2, the signal level of the interference system 3, and the intermodulation index of the combiner into the intermodulation interference expression, firstly determines the signal level of the maximum interfering system among the signal level of the interference system 1, the signal level of the interference system 2, and the signal level of the interference system 3, adds the signal level of the maximum interfering system to the intermodulation index of the combiner, obtains the sum, calculates the difference between the sum and the receiving band thermal noise of the interfered system and the noise coefficient of the receiver, adds the difference to a preset intermodulation interference value, and obtains the intermodulation interference isolation.

[0086] The intermodulation interference expression is as follows: MCL≥MAX(P1,P2,P3)+POI combiner intermodulation-Pn-Nf+7.

[0087] MCL3 is the intermodulation interference isolation requirement; Pn is the thermal noise in the receiving band of the interfered system, in dBm; Nf is the noise factor of the receiver, and the receiver noise factor of the base station generally does not exceed 5dB; P1 is the signal level of the interference system 1 (dBm); P2 is the signal level of the interference system 2 (dBm); P3 is the signal level of the interference system 3 (dBm); The intermodulation index of the POI combiner is generally -130 to -150dBc, here, -150dBc is taken.

[0088] The calculation method of the thermal noise of the interfered system is: Pn=-174+10*log(B), B is the operating bandwidth of the interfered system receiver. Taking GSM900 as an example, B is 26000000Hz; the signal level of the P1, P2, and P3 interference systems is the standard output power of the source equipment, which is obtained by the operator's optimization personnel.

[0089] Combined with the in-band noise of receivers in various frequency bands of various system standards, interference levels of various systems, POI intermodulation suppression and other indicators issued by the Ministry of Industry and Information Technology, according to the intermodulation interference isolation calculation formula, and considering the coexistence scenario of the civil communication 1800M system and the PIS system, the optimal isolation requirements for intermodulation interference are calculated as follows:

[0090] Table 4 Requirements for intermodulation interference isolation between systems

[0091]

[0092] In an optional embodiment, the first interference isolation, the second interference isolation and the third interference isolation are compared, and determining the interference isolation according to the comparison result includes: selecting the maximum isolation among the first interference isolation, the second interference isolation and the third interference isolation to obtain the target interference isolation.

[0093] Specifically, the server compares the calculated blocking interference isolation, spurious interference isolation and intermodulation interference isolation, selects the maximum isolation of the blocking interference isolation, the spurious interference isolation and the intermodulation interference isolation, and obtains the target interference isolation.

[0094] Coordinate the isolation data under three interference scenarios and calculate the interference isolation between systems according to the following method:

[0095] MCL=MAX(MCL1, MCL2, MCL3).

[0096] Among them: MCL is the target interference isolation, MCL1 is the blocking interference isolation, MCL2 is the stray interference isolation, and MCL3 is the intermodulation interference isolation.

[0097] The accurate requirements for interference isolation between systems are calculated as follows:

[0098] Table 5 Interference isolation requirements between systems

[0099]

[0100] The target interference isolation calculated in this embodiment can provide an accurate reference for customizing innovative POIs. When the existing subway lines are introduced into the 4G / 5G transformation, the stable operation of each system can be ensured, providing practical experience for similar scenarios across the country.

[0101] The theoretical data of interference isolation between systems are combined with the current technical level of POI products, and the theoretical parameters are implemented in actual products. Through physical simulation and measurement, reasonable out-of-band suppression indicators are determined to guide the generation of innovative high-suppression POI products.

[0102] Introducing 5G transformation technology to achieve: When introducing 5G transformation, 2.6G NR and 3.5G NR need to maintain 86dB interference isolation with other systems, based on POI combining The insertion loss is 4.5dB (the insertion loss of the 5G port in the mainstream POI products of the current tower enterprise standard is about 4-4.5dB, and this study takes 4.5dB as the standard), the jumper joint loss is 1.5dB (the current 3.5G feeder loss tower enterprise standard is 0.16dB / m, and the joint loss is 0.1dB / piece. The jumper in this study uses an 8-meter jumper and 2 joints, and the total jumper joint loss is 1.5dB). The interference isolation that 2.6G / 3.5G NR needs to maintain with other systems is: 86dB-4.5dB-1.5dB=80dB. The 2.6G / 3.5G frequency band is relatively large between other frequency bands, which can fully meet the 80dB interference isolation requirement. Communicating with mainstream POI manufacturers based on the existing price system can meet the needs of realizing 5G port customization of POI products for existing line transformation.

[0103] Introduce 4G transformation technology (not involving the original 1800M frequency band): When introducing the Telecom FDD1800 system, it is necessary to maintain 81dB interference isolation with non-1800M frequency bands. Based on the POI combining insertion loss of 6dB and the jumper joint loss of 1.5dB, the interference isolation that FDD1800M needs to maintain with other systems is: 81dB-6dB-1.5dB=73.5dB. Due to the large interval with other frequency bands, it can fully meet the 73.5dB interference isolation requirement.

[0104] Introduce 4G transformation technology (involving the original 1800M frequency band): When introducing the Telecom FDD1800 system, it is necessary to maintain 81dB isolation from the Mobile 1800M frequency band, and 64dB isolation from the PIS1800 system and the Unicom 1800M system. The insertion loss based on POI combining is 6dB, and the jumper joint loss is 1.5dB. The interference isolation required to be maintained with the Mobile FDD1800M system is: 81dB-6dB-1.5dB=73.5dB; the interference isolation required to be maintained with the PIS1800M system / Unicom FDD1800M system is: 64dB-6dB-1.5dB=56.5dB. Because there are 4 sets of continuous 1800M frequency bands in the same antenna feed system, if traditional metal resonators are used when customizing POI, because the frequency bands are continuous and there is no interval frequency band for system isolation, the volume of POI needs to be greatly increased to meet the corresponding interference isolation, and the insertion loss will increase, and indicators such as in-band fluctuation will be unstable. If dielectric ceramic resonators are used, the interference isolation requirements can be well met without increasing the volume, but the disadvantage is that the product cost will be greatly increased. In order to ensure the stable operation of the PIS1800 train control system, it is necessary to strictly ensure that the interference isolation of POI products meets the requirements.

[0105] Based on theoretical results and experimental simulations, two solutions can be used to achieve interference isolation between systems when introducing 4G / 5G transformation:

[0106] High suppression POI + FDD1800 external filter solution: On the basis of ensuring a certain frequency band isolation, it can achieve high interference isolation requirements. Advantages: 1. Cost fluctuation can be ignored. 2. No additional increase in product volume, no need for additional mold opening, and improved product supply efficiency. The disadvantage is that additional components are added, and the insertion loss is slightly increased.

[0107] Dielectric ceramic resonator type POI products: can achieve high interference isolation requirements. The advantages of dielectric ceramic resonators are as follows: 1. There is no additional increase in product volume. 2. The high dielectric constant makes the electromagnetic field energy concentrated in the dielectric and less distributed in the metal cavity, so the passive intermodulation performance is good. 3. The high Q value also increases the steepness of the mode dielectric region and reduces the loss of surface current on the metal, so it has the characteristics of low insertion loss and high suppression. Disadvantages: The cost is too high, and the production cost is doubled based on the existing price system.

[0108] Some POI products produced under the guidance of this application have been applied to actual reconstruction lines. The products use the high-inhibition POI + external high-inhibition filter solution to be applied to the subway line reconstruction project in the co-construction environment of civil communications and PIS systems. After testing and feedback, the effect is good. The electrical parameters of some POI + external high-inhibition filter products are as follows:

[0109] Table 6 Electrical performance requirements for 15-frequency wall-mounted & clamp-type (common tunnel type) POI

[0110]

[0111] Table 7 Mobile FDD1800 bandpass filter (standard type) specification requirements

[0112] model Mobile FDD1800 Bandpass Filter (Standard Type) ★Frequency range (MHz) 1710-1735MHZ&1810-1830MHZ ★Out-of-band suppression ≥40dB(@1785-1805MHZ) ★Third-order intermodulation (dBc) ≤-140(43dBm×2)

[0113] In order to facilitate understanding of the technical solutions provided in the embodiments of the present application, Figure 3 As shown, the interference isolation degree measurement method provided in the embodiment of the present application is briefly described with a complete interference isolation degree measurement process:

[0114] Step 302: Acquire the access frequency band of the system to be accessed and the access frequency band of the current system.

[0115] Step 304 , extracting multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system, and obtaining a signal reception interference indicator, a noise interference indicator, and a frequency interference indicator.

[0116] Step 306: The signal reception interference index includes a blocking level index of the receiver and an output power of the interference transmitter. A difference calculation is performed based on the blocking level index and the output power of the interference transmitter to obtain a first interference isolation degree.

[0117] Step 308, the noise interference index includes the spurious radiation level, the thermal noise in the receiving band of the interfered system, and the noise coefficient of the receiver. The spurious radiation level is calculated by the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system. The difference is calculated based on the spurious radiation level, the thermal noise in the receiving band of the interfered system, and the noise coefficient of the receiver to obtain the second interference isolation.

[0118] Step 310: The frequency interference index includes the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner. The third interference isolation is obtained by calculating the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner.

[0119] Step 312: Select the maximum isolation among the first interference isolation, the second interference isolation and the third interference isolation to obtain a target interference isolation.

[0120] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0121] Based on the same inventive concept, the embodiment of the present application also provides an interference isolation degree measurement device for implementing the interference isolation degree measurement method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the one or more interference isolation degree measurement device embodiments provided below can refer to the limitations of the interference isolation degree measurement method above, and will not be repeated here.

[0122] In one embodiment, Figure 4As shown, an interference isolation degree measuring device is provided, including: an acquisition module 402, an extraction module 404, a calculation module 406 and a comparison module 408, wherein:

[0123] The acquisition module 402 is used to acquire the access frequency band of the system to be accessed and the access frequency band of the current system.

[0124] The extraction module 404 is used to extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain a signal reception interference indicator, a noise interference indicator and a frequency interference indicator.

[0125] The calculation module 406 is used to calculate the interference isolation separately according to the signal reception interference index, the noise interference index and the frequency interference index to obtain the first interference isolation, the second interference isolation and the third interference isolation.

[0126] The comparison module 408 is used to compare the first interference isolation degree, the second interference isolation degree and the third interference isolation degree, and determine the interference isolation degree according to the comparison result.

[0127] In an optional embodiment, the signal reception interference index includes a blocking level index of the receiver and an output power of an interference transmitter; the calculation module 406 is further used to perform a difference calculation based on the blocking level index and the output power of the interference transmitter to obtain a first interference isolation degree.

[0128] In an optional embodiment, the noise interference index includes the spurious radiation level, the thermal noise in the receiving band of the interfered system, and the noise coefficient of the receiver; the calculation module 406 is also used to perform difference calculation based on the spurious radiation level, the thermal noise in the receiving band of the interfered system, and the noise coefficient of the receiver to obtain a second interference isolation degree.

[0129] In an optional embodiment, the spurious radiation level is calculated by using the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system.

[0130] In an optional embodiment, the frequency interference index includes the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner; the calculation module 406 is also used to calculate based on the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system, and the intermodulation index of the combiner to obtain a third interference isolation degree.

[0131] In an optional embodiment, the comparison module 408 is further configured to select a maximum isolation among the first interference isolation, the second interference isolation and the third interference isolation to obtain a target interference isolation.

[0132] Each module in the above interference isolation degree measurement device can be implemented in whole or in part by software, hardware and a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module above.

[0133] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store interference index data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an interference isolation degree measurement method is implemented.

[0134] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0135] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0136] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0137] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0138] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0139] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0140] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0141] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for calculating interference isolation, characterized in that: The method comprises: Obtain the access frequency band of the system to be accessed and the access frequency band of the current system; Extracting multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain a signal reception interference indicator, a noise interference indicator and a frequency interference indicator, wherein the frequency interference corresponding to the frequency interference indicator is an interference factor causing intermodulation interference; According to the signal reception interference index, the noise interference index and the frequency interference index, interference isolation is calculated separately to obtain a first interference isolation, a second interference isolation and a third interference isolation, wherein the third interference isolation is calculated according to the frequency interference index, including: calculating according to the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner to obtain the third interference isolation; in the case where the intermodulation interference is third-order intermodulation interference, the third interference isolation is calculated according to the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner, including: obtaining the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the first interfering system, the second interference index from the interference database The signal level of the interference system, the signal level of the third interference system and the intermodulation index of the combiner are input into the intermodulation interference expression, the signal level of the first interference system, the signal level of the second interference system, the signal level of the third interference system and the intermodulation index of the combiner, the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the first interference system, the signal level of the second interference system, the signal level of the third interference system and the intermodulation index of the combiner are input into the intermodulation interference expression, the signal level of the maximum interference system among the signal level of the first interference system, the signal level of the second interference system and the signal level of the third interference system are determined, the signal level of the maximum interference system is added to the intermodulation index of the combiner to obtain the sum, the difference between the sum and the thermal noise in the receiving band of the interfered system and the noise coefficient of the receiver is calculated, the difference is added to the preset intermodulation interference value, and the intermodulation interference isolation is obtained, wherein the third-order intermodulation characterizes the signal levels of at least three interference systems, and the intermodulation interference isolation is the third interference isolation; The first interference isolation, the second interference isolation, and the third interference isolation are compared, and the interference isolation is determined according to the comparison result.

2. The method according to claim 1, characterized in that The signal reception interference index includes a blocking level index of the receiver and an output power of the interference transmitter; Calculating according to the signal reception interference index to obtain a first interference isolation includes: A difference calculation is performed according to the blocking level indicator and the output power of the interference transmitter to obtain a first interference isolation degree.

3. The method according to claim 1, characterized in that The noise interference index includes the spurious radiation level, the thermal noise in the receiving band of the interfered system and the noise coefficient of the receiver; Calculating according to the noise interference index to obtain the second interference isolation includes: A second interference isolation degree is obtained by performing a difference calculation based on the spurious radiation level, the thermal noise in the receiving band of the interfered system, and the noise coefficient of the receiver.

4. The method according to claim 3, characterized in that The spurious radiation level is calculated by using the spurious radiation level of the interfering base station, the measurement bandwidth of the interference level, and the channel bandwidth of the interfered system.

5. The method according to claim 1, characterized in that The frequency interference index includes the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner.

6. The method according to claim 1, characterized in that The comparing the first interference isolation, the second interference isolation, and the third interference isolation, and determining the interference isolation according to the comparison result comprises: A maximum isolation among the first interference isolation, the second interference isolation and the third interference isolation is selected to obtain a target interference isolation.

7. An interference isolation measurement device, characterized in that: The device comprises: An acquisition module, used to acquire an access frequency band of a system to be accessed and an access frequency band of an existing system; An extraction module is used to extract multi-dimensional interference indicators according to the access frequency band of the system to be accessed and the access frequency band of the current system to obtain a signal reception interference indicator, a noise interference indicator and a frequency interference indicator, wherein the frequency interference corresponding to the frequency interference indicator is an interference factor causing intermodulation interference; A calculation module is used to calculate the interference isolation degree according to the signal reception interference index, the noise interference index and the frequency interference index, respectively, to obtain a first interference isolation degree, a second interference isolation degree and a third interference isolation degree, wherein the calculation according to the frequency interference index to obtain the third interference isolation degree includes: calculating according to the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner to obtain the third interference isolation degree; in the case where the intermodulation interference is third-order intermodulation interference, the calculation according to the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the interfering system and the intermodulation index of the combiner to obtain the third interference isolation degree includes: obtaining the receiving band thermal noise of the interfered system, the noise coefficient of the receiver, the signal level of the first interfering system, The signal level of the second interference system, the signal level of the third interference system and the intermodulation index of the combiner, the thermal noise in the receiving band of the interfered system, the noise coefficient of the receiver, the signal level of the first interference system, the signal level of the second interference system, the signal level of the third interference system and the intermodulation index of the combiner are input into the intermodulation interference expression, the signal level of the largest interference system among the signal level of the first interference system, the signal level of the second interference system and the signal level of the third interference system is determined, the signal level of the largest interference system is added to the intermodulation index of the combiner to obtain the sum, the difference between the sum and the thermal noise in the receiving band of the interfered system and the noise coefficient of the receiver is calculated, the difference is added to the preset intermodulation interference value, and the intermodulation interference isolation is obtained, wherein the third-order intermodulation characterizes the signal levels of at least three interference systems, and the intermodulation interference isolation is the third interference isolation; A comparison module is used to compare the first interference isolation degree, the second interference isolation degree and the third interference isolation degree, and determine the interference isolation degree according to the comparison result.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. 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 according to any one of claims 1 to 6 are implemented.

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