A 370MHz emergency communication network frequency planning and interference coordination system and method

Abstract

The present invention proposes a 370MHz emergency communication network frequency planning and interference coordination system and method, wherein the system includes: an information collection and management module, a central coordination processing module, a database module and a human-machine exchange and instruction issuance module; wherein the information collection and management module is used to collect and manage the status information of all base stations in the emergency communication network; the central coordination processing module performs frequency planning, interference analysis and prediction, and coordinated frequency decision-making based on the status information of all base stations, and generates corresponding decision-making instructions; the database module is used to store data required for system operation; the human-machine exchange and instruction issuance module is used to provide a visual interface, display system information and provide operators with operations, and issue the decision instructions generated by the central coordination processing module to the outside; the method adopts the above system to realize emergency communication network frequency planning and interference coordination.

Description

Technical Field

[0001] The present invention relates to a frequency planning and interference coordination system and method, in particular to a 370MHz emergency communication network frequency planning and interference coordination system and method. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Natural disasters place extremely high demands on emergency communications. A dedicated narrowband wireless communication network for emergency command has been established using the 370MHz frequency band, employing a PDT digital trunking system. This network is designed to connect both vertically and horizontally, serving as a reliable voice communication tool for emergency communication and command.

[0004] The existing "Frequency Plan for Emergency Command Narrowband Wireless Communications" (hereinafter referred to as the "Frequency Plan") has already made preliminary frequency allocations for fixed and mobile base stations, and has reserved expansion frequencies (KR), coordination frequencies (XT), and frequencies reserved for major events (ZD). Its planning principles include avoiding third-order intermodulation and adjacent-channel interference, and stipulate minimum frequency separations between co-stations (no less than 300kHz for fixed stations and no less than 50kHz for mobile stations) and minimum distances between co-frequency base stations in different locations (no less than 80km). The separately issued "Overall Technical Specifications for Emergency Command Narrowband Wireless Communications Network" (hereinafter referred to as the "Technical Specifications") define the system architecture, technical framework, and interface specifications.

[0005] However, in actual rescue operations, especially when major disasters cause large-scale communication paralysis, the existing fixed base station network will be fully activated. At the same time, mobile base stations (such as vehicle-mounted and backpack-mounted) will be deployed in large numbers and dynamically in key areas according to rescue needs.

[0006] The existing problems and shortcomings are mainly reflected in:

[0007] Existing frequency planning is mostly regional static allocation, which is difficult to adapt to the dynamic frequency requirements and complex electromagnetic environment brought about by large-scale, cross-regional, and simultaneous deployment of mobile base stations by multiple rescue teams.

[0008] The temporary and rapid deployment of a large number of mobile base stations, without effective real-time frequency coordination, can easily cause co-frequency and adjacent-frequency interference in the "last mile" or rescue core area, affecting command and dispatch efficiency and even leading to communication interruption.

[0009] Traditional frequency assignment and interference troubleshooting rely on manual or offline tools, which have slow response speeds and cannot meet the requirements for instant communication establishment in emergency scenarios.

[0010] 4. The lack of intelligent coordination means may lead to a shortage of some frequency resources, while other frequencies are not effectively utilized at specific times and spaces, especially in the use of coordinated frequencies (XT) and expansion frequencies (KR).

[0011] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0012] Purpose of the invention: The technical problem to be solved by the present invention is to provide a 370MHz emergency communication network frequency planning and interference coordination system and method in response to the shortcomings of the existing technology.

[0013] In order to solve the above technical problems, the present invention discloses a 370MHz emergency communication network frequency planning and interference coordination system and method, the system comprising:

[0014] Information collection and management module, central coordination processing module, database module and human-computer exchange and instruction issuance module; among them,

[0015] The information collection and management module is used to collect and manage the status information of all base stations in the emergency communication network;

[0016] The central coordination processing module performs frequency planning, interference analysis and prediction, and coordinated frequency decision-making based on the status information of all base stations, and generates corresponding decision instructions;

[0017] The database module is used to store data required for system operation;

[0018] The human-machine exchange and instruction issuing module is used to provide a visual interface, display system information for operators to operate, and issue the decision instructions generated by the central coordination processing module to the outside.

[0019] Furthermore, the information collection and management module includes:

[0020] Connect with emergency command centers, network management systems, or base stations at all levels to collect basic information, base station location information, and base station operating parameters of base stations in the emergency communication network; wherein the basic information includes: base station ID, base station type, and base station area; base station location information includes the latitude and longitude coordinates of the base station; base station operating parameters include: currently used frequency, channel number, transmit power, antenna parameters, operating mode, and current service load;

[0021] And import the preset frequency allocation table and frequency grouping.

[0022] Furthermore, the central coordination processing module includes:

[0023] Dynamic frequency planning submodule, interference analysis and warning submodule and coordination decision submodule; among them,

[0024] The dynamic frequency planning submodule performs frequency planning on base stations and allocates the optimal operating frequency to each base station;

[0025] The interference analysis and early warning submodule calculates the potential co-frequency or adjacent-frequency interference level between any two or more base stations and provides interference early warning;

[0026] The coordination decision submodule makes coordination decisions and adjusts the base station according to the interference warning.

[0027] Furthermore, the dynamic frequency planning submodule includes:

[0028] When a new base station deployment request is received, frequency planning is performed for the new base station based on the new base station deployment request and information about surrounding deployed base stations, combined with the preset static planning scheme and currently available frequency resources.

[0029] The frequency planning for the new base station may be performed in the following manner:

[0030] Step A1, information extraction and initialization, is as follows:

[0031] Extract the planned location P_new, type T_new and expected coverage requirement R_new of the new base station from the new base station deployment request;

[0032] Obtain the status information of the deployed base station BS_existing in the preset area D_scan from the database module, including: location, type, current frequency f_used, transmit power P_tx, and antenna parameters A_param;

[0033] Load the frequency group priority S_priority and the available channel list CH_avail in each frequency group in the preset static planning scheme;

[0034] Step A2, iteration and evaluation of candidate frequencies, traversing each frequency group in order of frequency group priority S_priority, and iterating the available channel list CH_avail in the group to select candidate frequencies f_candidate, that is, executing the screening rule for each candidate frequency f_candidate;

[0035] Step A3: Select the best operating frequency based on the result of executing the screening rules, and select the first candidate frequency f_candidate that passes all the screening rules as the recommended best operating frequency, or when multiple candidate frequencies f_candidate pass all the screening rules, select the recommended best operating frequency according to a preset strategy;

[0036] Step A4, ZD frequency processing, avoid assigning ZD frequencies when performing frequency planning for new base stations.

[0037] Furthermore, the screening rules described in step A2 are as follows:

[0038] Third-order intermodulation avoidance rule R1: For a new base station with multi-channel configuration, the combination of the candidate frequency f_candidate and other channels planned to operate simultaneously on the base station will not produce harmful third-order intermodulation products falling into the receiving frequency band;

[0039] Minimum co-station and inter-station frequency separation rule R2: If the new base station is configured with multiple channels, the interval between the candidate frequency f_candidate and other selected channels of the base station should not be less than the preset minimum co-station frequency separation;

[0040] Minimum geographic reuse distance rule R3: If the candidate frequency f_candidate is the same as the candidate frequency f_used used by any deployed base station BS_existing in the preset area D_scan, then the geographic distance between the new base station P_new and the deployed base station BS_existing is not less than the preset minimum geographic reuse distance;

[0041] Expected coverage and signal strength compatibility rule R4, based on the expected coverage requirement R_new and the terrain characteristics of the new base station P_new, determines whether the candidate frequency f_candidate meets the expected coverage requirement at the frequency point, taking into account the signal strength;

[0042] Pre-interference assessment rule R5 uses the candidate frequency f_candidate as the test frequency and calculates the carrier-to-interference ratio (C / I) or carrier-to-noise-plus-interference ratio (C / (N+I)) between the new base station P_new and all deployed base stations BS_existing within the preset area D_scan, as well as the carrier-to-interference ratio (C / (I)) generated by the new base station P_new to the deployed base station BS_existing, ensuring that both are greater than the preset interference decision threshold.

[0043] Furthermore, the interference analysis and early warning submodule includes the following specific methods for performing interference analysis and early warning:

[0044] In step B1, assume that the two base stations to be analyzed are BS_A and BS_B. Their status parameters, including location coordinates, operating frequency, transmit power, antenna parameters, and receiver sensitivity, are obtained from the database module. Preset parameters include the radio wave propagation model, interference decision threshold, and adjacent channel interference rejection ratio.

[0045] Step B2: Calculate the interference level, i.e., calculate the potential interference of base station BS_A to base station BS_B, i.e., the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I) of base station BS_A to base station BS_B;

[0046] Step B3: Perform interference warning determination. If the potential interference of base station BS_A on base station BS_B is less than a threshold, it is determined that base station BS_A has potential interference with base station BS_B, and an interference warning is generated.

[0047] Step B4, calculating the early warning of interference between multiple base stations, specifically as follows:

[0048] For the case of multiple interference sources on base station BS_B, the total interference power I_total_on_B is calculated by power synthesis:

[0049] I_total_on_B = 10*log10(Σ10^(I_k_on_B / 10))

[0050] Where, I_k_on_B is the interference power of the kth interference source to base station BS_B;

[0051] The total interference power I_total_on_B is then used to replace the potential interference of base station BS_A on base station BS_B in step 2. Steps B2 to B3 are executed to calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I) and perform interference warning.

[0052] Furthermore, the calculation in step B2 is for potential interference of base station BS_A to base station BS_B, and the specific method includes:

[0053] Step B2-1, path loss calculation, is as follows:

[0054] Calculate the geographic distance d_AB as follows:

[0055] d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B)

[0056] Among them, CalculateDistance means calculating the distance based on the coordinates;

[0057] Based on the geographical distance d_AB, the path loss L_p_AB is calculated as follows:

[0058] L_p_AB = M_prop(f_A, d_AB, h_tx_A, h_rx_B, TerrainType_AB)

[0059] Where M_prop represents the radio wave propagation model, f_A represents the operating frequency of base station BS_A, h_tx_A and h_rx_B represent the antenna heights of base stations BS_A and BS_B, and TerrainType_AB represents the terrain type on the path between base stations BS_A and BS_B.

[0060] Step B2-2: Calculate the signal power P_rx_AB received at base station BS_B from base station BS_A, as follows:

[0061] P_rx_AB (dBm) = P_tx_A + G_tx_A + G_rx_B - L_p_AB

[0062] Where P_tx_A represents the transmit power of base station BS_A, G_tx_A and G_rx_B represent the antenna gains of base stations BS_A and BS_B, respectively.

[0063] Step B2-3, calculate the interference power I_A_on_B according to the interference type, as follows:

[0064] When the interference type is co-channel interference, if:

[0065] |f_A - f_B|< Δf_co

[0066] but:

[0067] I_A_on_B = P_rx_AB

[0068] Where f_B represents the operating frequency of base station BS_B, and Δf_co is the co-channel determination bandwidth;

[0069] When the interference type is adjacent channel interference, if:

[0070] Δf_co ≤ |f_A - f_B|< Δf_adj

[0071] but:

[0072] I_A_on_B = P_rx_AB - ACIR_B

[0073] Wherein, Δf_adj is the adjacent channel determination bandwidth, ACIR_B is the interference suppression capability of base station BS_B to the adjacent channel;

[0074] Step B2-4, calculate the expected signal power P_desired_B received at base station BS_B, as follows:

[0075] If the base station BS_B is communicating, the expected signal power P_desired_B is the received power of the mobile station it serves to the base station BS_B;

[0076] If the base station BS_B is in the planning stage, the expected signal power P_desired_B is the minimum expected received power at the edge of its target coverage;

[0077] Step B2-5, calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I), as follows:

[0078] C / I_A_on_B (dB) = P_desired_B - I_A_on_B

[0079] Considering the background noise P_noise_B, then:

[0080] C / (N+I)_A_on_B (dB)

[0081] = P_desired_B - 10*log10(10^(P_noise_B / 10) + 10^(I_A_on_B / 10))

[0082] Wherein, C / I_A_on_B and C / (N+I)_A_on_B are respectively the carrier-to-interference ratio C / I and the carrier-to-noise-plus-interference ratio C / (N+I) of base station BS_A to base station BS_B.

[0083] Furthermore, the coordination decision submodule includes:

[0084] Step C1: After receiving the interference warning, analyze the warning information;

[0085] Step C2: Generate a coordination plan based on the preset coordination strategy;

[0086] Step C3: Use the interference analysis and warning submodule to perform interference evaluation on the generated coordination plan, and select the optimal coordination plan based on the interference evaluation result;

[0087] Step C4: convert the optimal coordination solution into an instruction and hand it over to the human-machine exchange and instruction issuing module for processing.

[0088] Furthermore, the coordination strategy described in step C2 includes:

[0089] ZD Frequency Disturbance Rules CS1:

[0090] If the interference source BS_source is not a ZD frequency user, immediately switch the interference source BS_source to an available coordination frequency XT or expansion frequency KR; if there is no available frequency, instruct the interference source BS_source to reduce the transmission power or temporarily shut down

[0091] If the interference source BS_source is a ZD frequency user, report it immediately;

[0092] Co-channel interference rule CS2:

[0093] When the interference is greater than the threshold:

[0094] If the interference source BS_source is a mobile base station or the preset priority is lower than the threshold, its frequency is adjusted to the XT or KR channel. The new frequency must pass the interference assessment.

[0095] If the interfered base station BS_victim is a mobile base station or the preset priority is lower than the threshold, and the interference source BS_sourc cannot be adjusted, its frequency is adjusted to the XT or KR channel. The new frequency must pass the interference assessment.

[0096] When the interference is less than the threshold:

[0097] If the frequency resource is less than the threshold, the transmit power of the interference source BS_source is reduced until the interference is eliminated or the minimum allowed power is reached;

[0098] If both the interference source BS_source and the interfered base station BS_victim are mobile base stations and the above measures are ineffective, increase the physical distance between them.

[0099] Adjacent channel interference rule CS3:

[0100] When the interference is greater than the threshold:

[0101] Adjust the frequency of the interference source BS_source or the interfered base station BS_victim to an adjacent available channel with a larger separation from the other within the original frequency group; if this is ineffective, adjust it according to the co-channel interference rule CS2;

[0102] Prompt to check the equipment parameters of the interfered base station BS_victim;

[0103] Multiple Interference Source Rule CS4:

[0104] Identify the interference source with the largest contribution and handle it according to the co-channel interference rule CS2 or the adjacent channel interference rule CS3.

[0105] The present invention also proposes a method for frequency planning and interference coordination of a 370 MHz emergency communication network, which uses the aforementioned system to perform frequency planning and interference coordination on a 370 MHz emergency communication network, including the following steps:

[0106] Step 1: Initialization and data loading, as follows:

[0107] Set up 370MHz frequency allocation planning table, frequency group definition, interference decision rules, GIS data and radio wave propagation model parameters;

[0108] Step 2: Real-time collection and update of base station information, as follows:

[0109] Receive status information reported by each deployed base station or pushed by the upper-level network management system, and update it in real time;

[0110] Step 3: When a new base station needs to be deployed, process the frequency planning request for the new base station deployment;

[0111] Step 4: Real-time interference analysis and warning, as follows:

[0112] Perform interference calculations between all base stations in the emergency communication network, as well as between multiple base stations, according to a preset periodicity or triggered by preset conditions;

[0113] If the interference value between any base stations exceeds the preset threshold, an interference warning message is generated;

[0114] Step 5, interference coordination and decision execution, is as follows:

[0115] Automatically generate a coordination plan based on interference warning information and preset coordination strategies;

[0116] After the coordination plan passes manual review or modification, it is sent for execution and step 3 is executed simultaneously to update the emergency communication network;

[0117] Step 6, status feedback and database update, as follows:

[0118] After updating the emergency communication network, record the latest status information and perform visual analysis.

[0119] Beneficial effects

[0120] 1. In response to the suddenness and uncertainty of mobile base stations in emergency scenarios, this invention can dynamically plan and allocate frequencies in real time, quickly respond to deployment needs, and ensure smooth communication in the "last mile", significantly outperforming traditional static plans.

[0121] 2. This invention integrates multi-dimensional information (base station parameters, GIS, and propagation models) to perform interference prediction and proactive coordination, effectively reducing co-channel and adjacent-channel interference between fixed and mobile base stations, as well as between mobile base stations, thereby improving the stability and reliability of communication links.

[0122] 3. This invention can intelligently schedule frequency groups with different attributes, such as Yd, XT, KR, and ZD, and dynamically adjust them according to actual needs and interference conditions, significantly improving the utilization efficiency of 370MHz spectrum resources, especially in large-scale emergency response.

[0123] 4. This invention provides situation visualization and intelligent recommendations, reducing reliance on manual experience, improving decision-making efficiency and deployment speed for emergency communications support, and enhancing the communication support capabilities of multi-team collaborative operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0124] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.

[0125] Figure 1 Schematic diagram of the system architecture of the present invention.

[0126] Figure 2 Schematic diagram of the process of the present invention.

[0127] Figure 3 Schematic diagram of human-computer interface interaction.

[0128] Figure 4 Schematic diagram of interference analysis. DETAILED DESCRIPTION

[0129] The present invention provides a 370MHz emergency communication network frequency planning and interference coordination system and method for realizing dynamic, real-time frequency planning and allocation in emergency scenarios, especially for temporarily deployed mobile / backpack base stations. It effectively predicts, identifies and coordinates potential frequency interference, reducing the risk of interference between fixed base stations and mobile base stations, and between mobile base stations. It improves the utilization efficiency of 370MHz frequency resources and the overall performance of the emergency communication network. It supports rapid response and deployment, and provides stable and reliable narrowband voice communication guarantee for emergency command. The overall technical solution of the present invention is as follows:

[0130] 1. System level

[0131] Setting information module: used for real-time collection and management of dynamic parameters such as location and frequency of fixed and mobile base stations (compatible with JSON format)

[0132] Set up a central processing module: It includes three core functions: dynamic frequency planning, interference analysis and warning, and coordinated decision-making.

[0133] Setup database: stores static planning data (including Gd / Yd / XT / KR / ZD frequency group definitions), real-time network status, and GIS data.

[0134] Set up interactive module: provide visual operation and command issuance.

[0135] 2. Methodology

[0136] Adopt dynamic frequency allocation method: for newly deployed (especially mobile) base stations,

[0137] Automatically recommend and allocate operating frequencies based on the real-time network environment, preset frequency group strategies (Yd priority, XT coordination, etc.) and interference avoidance principles (minimum frequency separation, geographical reuse).

[0138] Adopting active interference warning and coordination methods: Based on multi-dimensional information (base station parameters, GIS, propagation model), it predicts and quantifies potential interference in real time, triggers alarms when the limit is exceeded, and intelligently generates coordination plans including frequency adjustment (such as switching to XT / ZD group) and power control measures.

[0139] Adopt a closed-loop processing flow: From information collection, dynamic planning / interference analysis, solution generation, instruction issuance to status feedback, a closed loop is formed to achieve continuous optimization and adaptive adjustment.

[0140] The specific technical solutions of the present invention are as follows:

[0141] The system, such as Figure 1 As shown, it mainly includes: information collection and management module, central coordination and processing module, database module and human-computer exchange and instruction issuance module.

[0142] 1. Information collection and management module

[0143] Responsible for collecting and managing real-time or near-real-time status information for all fixed and mobile / backpack base stations in the network. This system collects basic base station information (base station ID, base station type, and region), base station location information (latitude and longitude coordinates), and base station operating parameters (current frequency, channel number, transmit power, antenna parameters, operating mode, current traffic load, etc.), importing the national frequency allocation table and frequency grouping plan from the "Frequency Plan." It connects via wired or wireless means to emergency command centers at all levels, network management systems, or directly to base stations with reporting capabilities.

[0144] 2. Central coordination processing module

[0145] The core of the system executes frequency planning algorithms, interference analysis and prediction, and coordination decisions. It is divided into three sub-modules:

[0146] Module 1: Dynamic Frequency Planning Sub-module

[0147] When a deployment request for a new base station (e.g., mobile / backpack base station) is received, its workflow is as follows:

[0148] 1) Information extraction and initialization:

[0149] Extract the predetermined location (P_new), type (T_new), and expected coverage requirement (R_new) of the new base station from the deployment request, and obtain the status information (location, type, currently used frequency f_used), transmission power P_tx, and antenna parameters A_param) of the already deployed base stations (BS_existing) within the weekly report area (e.g., centered on P_new, with a radius D_scan determined according to the transmission power level of T_new, such as 5 - 20 km for backpack type and 20 - 50 km for vehicle-mounted type) from the database module. At the same time, load the preset frequency group priorities (S_priority = {Yd_local, XT, KR, Gd_idel}) and the available channel lists (CH_avail) within each frequency group.

[0150] 2) Candidate frequency iteration and evaluation: Traverse each frequency group in the order of S_priority, and iteratively select candidate frequencies (f_candidate) from the CH_avail within the group. For each f_candidate, perform the following rule checks:

[0151] * Rule R1 (Third-order intermodulation avoidance):

[0152] For a mobile base station with a multi-channel configuration, ensure that f_candidate and the channel combinations that are planned to work simultaneously on this base station do not generate harmful third-order intermodulation products that fall into the receiving frequency band.

[0153] Application steps of R1:

[0154] Assume that the new base station is planned to be configured with N channels, and currently, the frequency f_candidate is being selected for the Kth channel (1 ≤ k ≤ N), and the frequencies f_1, f_2,..., f_{k - 1} have been selected for the previous k - 1 channels.

[0155] (1) Construct frequency combinations: Combine f_candidate with f_1, f_2,..., f_{k - 1} that have already been selected for this base station. Check pairwise. For each selected frequency f_i (i < k), calculate the third-order intermodulation product generated by f_candidate and f_i:

[0156] f_imp1 = 2 * f_candidate - f_i

[0157] f_imp2 = 2 * f_i - f_candidate

[0158] (2) Determine the receiving frequency band: Get the receiving frequency range of the base station (Rx_Band_Start, Rx_Band_End).

[0159] (3) Harmfulness judgment: For each calculated intermodulation product frequency f_imp: determine whether it falls into the receiving frequency band, and check Rx_Band_Start ≤ f_imp ≤ Rx_Band_End.

[0160] (4) Rule verification results:

[0161] If any of the calculated f_imp is judged to be harmful, the current f_candidate does not satisfy rule R1 and should be excluded.

[0162] If all calculated f_imp do not fall within the receiving frequency band or its actual receiving channel, or their estimated strengths are much lower than the receiver sensitivity, f_candidate passes the rule R1 check.

[0163] * Rule R2 (minimum frequency separation between the same station and different stations)

[0164] If the new base station is configured with multiple channels, the interval between f_candidate and other selected channels of the base station should be no less than the preset minimum co-station frequency interval (e.g., 50kHz for mobile stations).

[0165] The frequency interval between f_candidate and f_used used by any BS_existing within the surrounding D_scan range should meet the following requirements:

[0166] If BS_existing is a fixed station, the interval is >= 300kHz.

[0167] If BS_existing is a mobile station, the interval is >= 50kHz.

[0168] If the BS_existing and the new base station are of different types (one fixed and one mobile), the interval is >= the preset hybrid safety threshold (e.g., 150kHz).

[0169] * Rule R3 (Minimum Geographic Reuse Distance):

[0170] If f_candidate and f_used used by any BS_existing within the D_scan range are the same frequency, the geographical distance between the new base station P_new and the BS_existing should not be less than the preset minimum geographical reuse distance (e.g., 80 km).

[0171] * Rule R4 (Expected Coverage and Signal Strength Compatibility):

[0172] Based on the terrain characteristics of R_new and P_new, a preliminary judgment is made as to whether f_candidate can meet basic coverage expectations at this frequency point, taking into account the signal strength.

[0173] * Rule R5 (Pre-interference Assessment): Invoke the evaluation logic of the Interference Analysis and Warning submodule, using f_candidate as the test frequency, and calculate the potential C / I or C / (N+I) between the new base station deployed at location P_new and all existing BSs within D_scan, as well as the potential C / I or C / (N+I) generated by the new base station to all existing BSs within D_scan. Ensure that the predicted C / I or C / (N+I) is greater than the preset interference decision threshold.

[0174] 1) Optimal operating frequency selection:

[0175] The first f_candidate that passes all the rules R1-R5 is selected as the recommended optimal operating frequency.

[0176] Optional optimization: If multiple f_candidates pass the verification, you can further select according to the following strategy:

[0177] Strategy O1 (maximum interference margin): select the f_candidate that has the largest predicted C / I or C / (N+I) margin in rule R5.

[0178] Strategy O2 (Load Balancing): If the system has frequency load statistics capability, select the f_candidate with the lowest historical occupancy or real-time traffic in the current area (or within the frequency group to which it belongs).

[0179] 2) ZD frequency processing:

[0180] The reserved frequencies (ZD) for major emergencies dispatched by the ministry are not involved in the above automatic planning process. Their use is uniformly assigned by the highest command organization based on the emergency response level and needs. This module should avoid assigning ZD frequencies during planning and ensure that communications on ZD frequencies are not affected during interference analysis.

[0181] Module 2: Interference Analysis and Warning Submodule

[0182] The working method is as follows:

[0183] 1) Parameter definition and acquisition

[0184] For any two base stations BS_A (potential interference source or interfered object) and BS_B (potential interfered object or interference source), obtain their state parameters from the database module:

[0185] Position coordinates: (Lat_A, Lon_A), (Lat_B, Lon_B)

[0186] Operating frequency: f_A, f_B (center frequency)

[0187] Transmit power: P_tx_A (dBm)

[0188] Antenna parameters: antenna gain G_tx_A, G_rx_B (dBi); antenna height h_tx_A, h_rx_B (m); antenna radiation pattern.

[0189] Receiver sensitivity: S_rx_B (dBm) or noise floor P_noise_B (dBm).

[0190] Preset parameters:

[0191] Radio wave propagation model (M_prop): such as Okumura-Hata, Longley-Rice, or a model optimized for a specific terrain. This model calculates the path loss L_p (dB) based on frequency, distance, antenna height, and terrain type (obtained from GIS data).

[0192] Interference decision threshold (Threshold_interf): Such as the required minimum C / I value C / I_req (dB) or the minimum C / (N+I) value C / (N+I)_req (dB).

[0193] Adjacent channel interference rejection ratio (ACIR_B): The interference suppression capability of base station B to adjacent channels (dB).

[0194] 2) Interference level calculation (for potential interference from BS_A to BS_B):

[0195] Step 2.1 (Path loss calculation):

[0196] Geographic distance d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B).

[0197] Path loss \(L_p_{AB}=M_{prop}(f_A, d_{AB}, h_{txA}, h_{rxB}, TerrainType_{AB})\).

[0198] Step 2.2 (Received signal power \(P_{rxAB}\) from \(BS_A\) at \(BS_B\)):

[0199] \(P_{rxAB}(dBm)=P_{txA}+G_{txA}+G_{rxB}-L_p_{AB}\).

[0200] Step 2.3 (Interference type judgment and interference power \(I_{AonB}\) calculation):

[0201] Co-channel interference (CCI): If \(|f_A - f_B|\lt\Delta f_{co}\) (\(\Delta f_{co}\) is the co-channel decision bandwidth, e.g., 1 kHz), then \(I_{AonB}=P_{rxAB}\).

[0202] Adjacent-channel interference (ACI): If \(\Delta f_{co}\leq|f_A - f_B|\lt\Delta f_{adj}\) (\(\Delta f_{adj}\) is the adjacent-channel decision bandwidth, e.g., 25 kHz), then \(I_{AonB}=P_{rxAB}-ACIR_B\).

[0203] Other remote interference: Can be ignored in this model.

[0204] Step 2.4 (Desired signal power \(P_{desiredB}\) received at \(BS_B\)): This value depends on the communication link of \(BS_B\) itself. If \(BS_B\) is in communication, it can be the received power from the mobile station served by it to \(BS_B\); or in the planning stage, it is the minimum desired received power at the target coverage edge of it.

[0205] Step 2.5 (Calculation of carrier-to-interference ratio \(C / I\) or carrier-to-noise-plus-interference ratio \(C / (N + I)\)):

[0206] C / I_A_on_B (dB) = P_desired_B - I_A_on_B.

[0207] [[ID=3X]]If considering the background noise:

[0208] P_noise_B: C / (N+I)_A_on_B (dB) = P_desired_B - 10*log10(10^(P_noise_ B / 10) + 10^(I_A_on_B / 10)).

[0209] 3) Interference warning determination

[0210] If \(C / I_{AonB}\lt C / I_{req}\) (or \(C / (N + I)_{AonB}\lt C / (N + I)_{req}\)), it is determined that there is potential interference from \(BS_A\) to \(BS_B\), and an interference warning is generated.

[0211] 4) Module application scenarios

[0212] Pre-interference assessment uses the newly deployed base station as BS_A, the candidate frequency as f_A, and the surrounding existing base stations as BS_B to perform the above calculations to ensure that the new frequency does not cause unacceptable interference to the existing network and that the new base station itself is not subject to excessive interference from existing base stations.

[0213] "Failure to meet the non-interference condition": When the dynamic frequency planning submodule attempts to perform "pre-interference assessment" on all available channels in a frequency group (such as the Yd group), if all channels result in the calculated C / I (or C / (N+I)) being less than the corresponding threshold, the frequency group is determined to "failure to meet the non-interference condition."

[0214] Interference calculation: The system periodically (e.g., every N minutes) or when any base station status (location, frequency, power) changes significantly, performs the above interference level calculation for all base station pairs (BS_i, BS_j) in the network that may affect each other.

[0215] 5) Interference between multiple base stations

[0216] For the case of multiple interference sources to a single victim, the total interference power I_total_on_B can be calculated by power synthesis. :I_total_on_B = 10*log10(Σ 10^(I_k_on_B / 10)) , where I_k_on_B is the interference power of the kth interferer on BS_B. I_total_on_B is then used to calculate C / I or C / (N+I).

[0217] Module 3: Coordination and Decision-making Submodule

[0218] After receiving the interference warning from the interference analysis and warning submodule, the workflow and coordination plan generation logic are as follows:

[0219] (1) Analysis of warning information: Extract key information of interference warning, including: interference source base station (BS_source), interfered base station (BS_victim), interference type (T_interf: same-frequency CCI, adjacent-frequency ACI, etc.), interference severity (S_interf: such as the difference between the C / I value and the threshold ΔC / I), and the importance of the affected service (P_service: such as whether it involves the command link, ZD frequency, etc.).

[0220] (2) Definition of coordination strategy priority:

[0221] P0 (highest): Securing ZD frequency communications is an absolute priority and any interference with the ZD frequency must be coordinated immediately.

[0222] P1: Ensure the core link of emergency command (can be pre-marked or dynamically identified).

[0223] P2: Prioritize base stations that are easier to adjust (e.g., mobile base stations take precedence over fixed base stations, and non-critical service base stations take precedence over critical service base stations).

[0224] P3: Prioritize the coordination measures with the lowest cost (e.g., small power adjustments take precedence over frequency changes, and frequency changes take precedence over physical migration).

[0225] P4: After coordination, interference assessment must be conducted again to ensure that the new plan does not introduce new serious interference.

[0226] (3) Coordination scheme generation rule set:

[0227] * Rule CS1 (ZD frequency disturbed):

[0228] Action A1.1: If BS_source is not a ZD frequency user, immediately attempt to switch BS_source to an available coordinated frequency XT or expansion frequency KR. If no frequency is available, instruct BS_source to significantly reduce its transmit power or temporarily shut down.

[0229] Action A1.2: If BS_source is also a ZD frequency user, immediately report to the highest command organization for decision.

[0230] * Rule CS2 (Co-channel Interference CCI):

[0231] Prerequisite: ΔC / I is large (severe interference).

[0232] Action A2.1 (Adjust interference source): If BS_source is a mobile base station or has a low priority, try to adjust its frequency to an available XT or KR channel. The new frequency must pass the pre-interference assessment.

[0233] Action A2.2 (Adjust victim): If BS_victim is a mobile base station or has a low priority, and adjusting BS_source is difficult, try adjusting its frequency to an available XT or KR channel. The new frequency must pass the pre-interference assessment.

[0234] Action A2.3 (power control): If ΔC / I is small and frequency resources are limited, try to gradually reduce the transmit power of BS_source until the interference is eliminated or the minimum allowed power is reached.

[0235] Action A2.4 (Physical relocation suggestion): If both BS_source and BS_victim are mobile base stations and the above measures are ineffective or not feasible, it is recommended to increase the physical distance between them.

[0236] * Rule CS3 (Adjacent Channel Interference ACI):

[0237] Prerequisite: ΔC / I is large.

[0238] Action A3.1 (Increase frequency separation): If BS_source or BS_victim has room to adjust, try to adjust its frequency to a nearby available channel with a larger separation from the other party (still within the original frequency group or XT / KR group).

[0239] Action A3.2 (refer to frequency adjustment and power control in CS2): If A3.1 is invalid, refer to the frequency adjustment and power control actions in CS2.

[0240] Action A3.3 (Check device parameters): Prompt to check whether the adjacent channel selectivity of BS_victim or the out-of-band leakage of BS_source meets the specifications.

[0241] * Rule CS4 (Multiple Interference Sources):

[0242] Action A4.1: Identify the main interference source (the one with the largest contribution) and prioritize handling it according to CS2 or CS3.

[0243] Action A4.2: If there is no single primary interference source, or if interference still exists after treatment, consider adjusting the frequency or power of multiple secondary interference sources.

[0244] (4) Coordinate program evaluation and selection:

[0245] For each generated candidate coordination plan, the interference analysis and warning submodule is called to perform "post-effect evaluation" to predict the network interference situation after the plan is executed.

[0246] Select one or more solutions (sorted by recommendation) that can effectively eliminate or significantly reduce the current interference and introduce minimal (or no) new interference.

[0247] (5) Generate coordination instructions: Convert the selected coordination scheme into specific instructions, for example:

[0248] Command 1: "Base station ID [BS_source_ID], switch operating frequency to channel number [New_Channel_Num]".

[0249] Command 2: "Base station ID [BS_source_ID], transmit power adjusted to [New_Power_Level] dBm."

[0250] Command 3: "Recommend moving base station ID [Mobile_BS_ID] in the direction [Direction] by [Distance] kilometers."

[0251] (6) Human-computer interaction and issuance: The recommended coordination instructions and evaluation results are displayed to the

[0252] Operator: The operator can review, modify or directly confirm and issue.

[0253] 3. Database module

[0254] This system stores various data required for system operation. This includes static data (the national 370MHz frequency allocation plan, the correspondence between channel numbers and specific frequencies for each frequency group (Gd, Yd, KR, XT, ZD), radio wave propagation model parameters, geographic information system data, and an interference decision rule library). It also stores dynamic data (real-time base station status information, historical interference event records, and current frequency occupancy status maps).

[0255] 4. Human-computer interaction and command issuance module

[0256] Provides a visual interface for operators to monitor network status, receive warnings, and execute or adjust coordination instructions, such as Figure 3 The final command is then sent to the relevant base station or network management system. This allows operators to manually enter information about newly deployed base stations, query frequency usage in a specific area, and confirm or modify the system's recommended frequency planning and interference coordination plans. Frequency adjustment, power control, and other commands are sent to the base station controller or a base station with remote configuration capabilities through a predefined interface.

[0257] In addition, if Figure 2 As shown, the method proposed by the present invention specifically includes the following steps:

[0258] Step 1: Initialization and data loading

[0259] When the system starts, the national 370MHz frequency allocation plan, frequency group definitions, interference decision rules, GIS data and radio wave propagation model parameters are loaded from the database module.

[0260] Step 2: Real-time collection and update of base station information

[0261] The information collection and management module continuously receives status information (such as location, frequency, and power) from each deployed fixed base station and mobile / backpack base station, or from the upper-level network management system, and updates the database module in real time. The information format follows the JSON specification.

[0262] Step 3: Frequency planning request processing for new base station deployment

[0263] When a new mobile / manpack base station (or temporary fixed base station) needs to be deployed, the operator enters the base station's intended deployment location, type (e.g., manpack), expected coverage requirements, and optional antenna parameters through the human-computer interaction module. The central coordination processing module receives the request, and the dynamic frequency planning submodule is activated.

[0264] Step 4: Dynamic Frequency Planning and Allocation

[0265] The dynamic frequency planning submodule queries the database for information about existing base stations within a certain geographical range (e.g., a radius of 5-100 kilometers, adjustable based on base station type and power) based on the planned location of the newly deployed base station. The optimal operating frequency is selected by comprehensively considering the following factors:

[0266] 1) Availability: Priority is given to selecting from the pre-allocated mobile frequency group Yd in the city. If frequencies in group Yd do not meet the interference-free condition, the coordinated frequency group XT will be considered. In special circumstances, with authorization, the expanded frequency group KR or frequencies in group Gd not used by fixed stations in the area may be considered. In the event of a major disaster, the ministerial-level reserved ZD frequencies will be centrally dispatched by the highest command organization.

[0267] 2) Isolation: Ensure that the selected frequency and the frequencies of existing surrounding base stations meet the minimum same-site / different-site frequency separation requirements (>=300kHz between fixed sites, >=50kHz between mobile sites) and the geographical reuse distance requirements (e.g., 80km).

[0268] 3) Interference prediction: Use the interference analysis and early warning submodule to perform pre-interference assessment on candidate frequencies and select the frequency with the least interference.

[0269] 4) Load balancing (optional): If there are multiple available frequencies, consider selecting a frequency with lower occupancy in the current area.

[0270] The final planning results (recommended frequency, power recommendations, etc.) are displayed to the operator for confirmation through the human-computer interaction module.

[0271] Step 5: Real-time interference analysis and warning

[0272] like Figure 4 As shown, the interference analysis and warning submodule periodically (or triggered by a change in any base station status) calculates interference between all base stations in the network, both pairwise and across multiple base stations. If the calculated interference value between any base stations exceeds a preset threshold, an interference warning is generated and alerted to the operator through the human-computer interaction module, indicating the interference source, the target being interfered with, and the type of interference.

[0273] Step 6: Interference Coordination and Decision Execution

[0274] The coordination decision submodule automatically generates one or more coordination plans (such as adjusting frequency, reducing power, adjusting antennas, etc.) based on the received interference warnings and combined with preset coordination strategies (such as priority, cost-effectiveness, etc.). The coordination plan is submitted to the operator for review through the human-computer interaction module. The operator can choose to accept the system-recommended plan or modify it. The confirmed coordination command is transmitted to the control system or network management system of the target base station through the command issuance interface for execution. If the coordination involves a frequency change, part of the logic in step 4 needs to be re-executed to ensure the applicability of the new frequency.

[0275] Step 7: Status feedback and database update

[0276] After executing the coordination instruction, the base station reports its latest status information; the system records the operation and results of this frequency planning or interference coordination, and updates the status and frequency occupancy map of the relevant base stations in the database.

[0277] Example 1: Frequency Planning for Rapid Deployment of Mobile Backpack Base Stations

[0278] A mudslide struck a mountainous area, disrupting public network communications. A rescue team, carrying a backpack-mounted PDT ad hoc network base station (with a 3-hop, 4-node capability), entered the disaster zone.

[0279] 1. Information Collection: The rescue team commander uses a handheld terminal (with an integrated human-computer interaction module) to input the latitude and longitude of the planned backpack base station installation point A, the base station type as "Backpack - Yd Priority," and the desired coverage radius of 1 kilometer. The system already contains static planning data for the Gd group of fixed base stations in the province and city, as well as real-time information for a small number of activated fixed base stations.

[0280] 2. Planning request: Information is submitted to the central coordination and processing module deployed in the rear command post via a wireless link (such as satellite or a nearby temporary public network access point).

[0281] 3. Frequency Planning: The dynamic frequency planning submodule determines that there are no other occupied 370MHz frequencies within 20 kilometers of Point A. Based on the Yd1 group frequencies in the province (e.g., channels 8 / 103 / 208) as the preferred frequency, channel 8 (372.1000 / 382.1000MHz) is selected and assigned to the backpack base station. An initial transmit power level (e.g., 5W) is also recommended.

[0282] 4. Result Feedback: The planning results (channel number 8, power recommendation) are returned to the rescue team's handheld terminal. After the commander confirms, the backpack base station is configured and started according to these parameters. The system database updates the backpack base station information.

[0283] Example 2: Interference warning and coordination in a scenario with multiple base stations

[0284] During the earthquake relief efforts, City A activated fixed base station group Gd2 (channels 51 / 139) as planned. Neighboring County B (which planned to use group Yd2, including channels 21 / 125 / 260) deployed an emergency communications vehicle (mobile base station) at Point C, the border between City A and County B, using channel 21 of the Yd2 group. Simultaneously, another provincial support team deployed their backpack base station D near Point C. To quickly establish communications, they also attempted to use the unused Yd2 group channel 125.

[0285] 1. Information Update and Interference Analysis: Each base station's information (including the location and frequency of the mobile base station at Point C and the piggyback base station at Point D) is reported to the system. The interference analysis and warning submodule calculates that due to the geographical proximity and small frequency separation between the base stations at Points C and D (channels 21 and 125), there may be a certain risk of adjacent-channel interference or intermodulation interference. Furthermore, the edge of Point D's coverage area may cause weak co-channel interference in a specific direction with a certain edge coverage area of the Gd2 fixed base station in City A (if the actual frequency used at Point D conflicts with Gd2).

[0286] 2. Warning and Decision: The system highlights points C and D on the user interface and issues an interference warning. The coordination decision submodule analyzes the proximity between points C and D and recommends switching frequencies for the base station at point D. A database query indicates that channel 122 (373.5250 / 383.5250 MHz) in the coordinated frequency group XT is available in the current area and has good isolation from other base stations.

[0287] 3. Coordinated Execution: The system recommends adjusting the frequency of the piggyback base station at point D to channel 122. After the operator confirms the recommendation, the command is wirelessly transmitted to base station D for adjustment. After the adjustment, the system re-evaluates the interference and confirms that the risk has been eliminated.

[0288] In a specific implementation, this application provides a computer storage medium and a corresponding data processing unit. The computer storage medium is capable of storing a computer program that, when executed by the data processing unit, executes the invention disclosure of a 370 MHz emergency communication network frequency planning and interference coordination system and method provided by the present invention, as well as some or all of the steps in each embodiment. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0289] Those skilled in the art will clearly understand that the technical solutions in the embodiments of the present invention can be implemented using computer programs and their corresponding general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a computer program, i.e., a software product. This computer program software product can be stored in a storage medium and includes instructions for enabling a device including a data processing unit (such as a personal computer, server, single-chip microcomputer, MCU, or network device) to execute the methods described in various embodiments of the present invention or certain portions of these embodiments.

[0290] The present invention provides a system and method for frequency planning and interference coordination of a 370 MHz emergency communication network. There are numerous methods and approaches for implementing this technical solution. The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A 370MHz emergency communication network frequency planning and interference coordination system, characterized in that: include: Information collection and management module, central coordination processing module, database module and human-computer exchange and instruction issuance module; among them, The information collection and management module is used to collect and manage the status information of all base stations in the emergency communication network; The central coordination processing module performs frequency planning, interference analysis and prediction, and coordinated frequency decision-making based on the status information of all base stations, and generates corresponding decision instructions; The database module is used to store data required for system operation; The human-machine exchange and instruction issuing module is used to provide a visual interface, display system information and allow operators to operate, and issue the decision instructions generated by the central coordination processing module to the outside; Wherein, the information collection and management module is used to: Connect with emergency command centers, network management systems, or base stations at all levels to collect basic information, base station location information, and base station operating parameters in the emergency communication network, and import preset frequency allocation tables and frequency groups; wherein the basic information includes: base station ID, base station type, and base station area; base station location information includes the latitude and longitude coordinates of the base station; base station operating parameters include: currently used frequency, channel number, transmit power, antenna parameters, operating mode, and current service load; The central coordination processing module includes: Dynamic frequency planning submodule, interference analysis and warning submodule and coordination decision submodule; among them, The dynamic frequency planning submodule performs frequency planning on base stations and allocates the optimal operating frequency to each base station; The interference analysis and early warning submodule calculates the potential co-frequency or adjacent-frequency interference level between any two or more base stations and provides interference early warning; The coordination decision submodule makes coordination decisions and adjusts the base station according to the interference warning; The dynamic frequency planning submodule is used to: When a new base station deployment request is received, frequency planning is performed for the new base station based on the new base station deployment request and information about surrounding deployed base stations, combined with the preset static planning scheme and currently available frequency resources. The frequency planning for the new base station may be performed in the following manner: Step A1, information extraction and initialization, is as follows: Extract the planned location P_new, type T_new and expected coverage requirement R_new of the new base station from the new base station deployment request; Obtain the status information of the deployed base station BS_existing in the preset area D_scan from the database module, including: location, type, current frequency f_used, transmit power P_tx, and antenna parameters A_param; Load the frequency group priority S_priority and the available channel list CH_avail in each frequency group in the preset static planning scheme; Step A2, iteration and evaluation of candidate frequencies, traversing each frequency group in order of frequency group priority S_priority, and iterating the available channel list CH_avail in the group to select candidate frequencies f_candidate, that is, executing the screening rule for each candidate frequency f_candidate; Step A3: Select the best operating frequency based on the result of executing the screening rules, and select the first candidate frequency f_candidate that passes all the screening rules as the recommended best operating frequency, or when multiple candidate frequencies f_candidate pass all the screening rules, select the recommended best operating frequency according to a preset strategy; Step A4: Processing of the frequency reserved for major events, i.e., ZD frequency. When performing frequency planning for new base stations, avoid assigning ZD frequencies.

2. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 1, characterized in that: The screening rules described in step A2 are as follows: Third-order intermodulation avoidance rule R1: For a new base station with multi-channel configuration, the combination of the candidate frequency f_candidate and other channels planned to operate simultaneously on the base station will not produce harmful third-order intermodulation products falling into the receiving frequency band; Minimum co-station and inter-station frequency separation rule R2: If the new base station is configured with multiple channels, the interval between the candidate frequency f_candidate and other selected channels of the base station should not be less than the preset minimum co-station frequency separation; Minimum geographic reuse distance rule R3: If the candidate frequency f_candidate is the same as the candidate frequency f_used used by any deployed base station BS_existing in the preset area D_scan, then the geographic distance between the new base station P_new and the deployed base station BS_existing is not less than the preset minimum geographic reuse distance; Expected coverage and signal strength compatibility rule R4, based on the expected coverage requirement R_new and the terrain characteristics of the new base station P_new, determines whether the candidate frequency f_candidate meets the expected coverage requirement, and takes into account the signal strength; Pre-interference assessment rule R5 uses the candidate frequency f_candidate as the test frequency and calculates the carrier-to-interference ratio (C / I) or carrier-to-noise-plus-interference ratio (C / (N+I)) between the deployed new base station P_new and all deployed base stations BS_existing within the preset area D_scan, as well as the carrier-to-interference ratio (C / (I)) generated by the deployed base station BS_existing, to ensure that both are greater than the preset interference decision threshold.

3. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 2, characterized in that: The interference analysis and early warning submodule performs interference analysis and early warning in the following specific methods: In step B1, assume that the two base stations to be analyzed are BS_A and BS_B. Their status parameters, including location coordinates, operating frequency, transmit power, antenna parameters, and receiver sensitivity, are obtained from the database module. Preset parameters include the radio wave propagation model, interference decision threshold, and adjacent channel interference rejection ratio. Step B2: Calculate the interference level, i.e., calculate the potential interference of base station BS_A to base station BS_B, i.e., the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I) of base station BS_A to base station BS_B; Step B3: Perform interference warning determination. If the potential interference of base station BS_A on base station BS_B is less than a threshold, it is determined that base station BS_A has potential interference with base station BS_B, and an interference warning is generated. Step B4, calculating the early warning of interference between multiple base stations, specifically as follows: For the case of multiple interference sources on base station BS_B, the total interference power I_total_on_B is calculated by power synthesis: I_total_on_B = 10*log10(Σ10^(I_k_on_B / 10)) Where, I_k_on_B is the interference power of the kth interference source to base station BS_B; The total interference power I_total_on_B is then used to replace the potential interference of base station BS_A on base station BS_B in step 2. Steps B2 to B3 are executed to calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I) and perform interference warning.

4. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 3, characterized in that: The specific method for calculating the potential interference of base station BS_A to base station BS_B in step B2 includes: Step B2-1, path loss calculation, is as follows: Calculate the geographic distance d_AB as follows: d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B) Among them, CalculateDistance means calculating the distance based on the coordinates; Based on the geographical distance d_AB, the path loss L_p_AB is calculated as follows: L_p_AB = M_prop(f_A, d_AB, h_tx_A, h_rx_B, TerrainType_AB) Where M_prop represents the radio wave propagation model, f_A represents the operating frequency of base station BS_A, h_tx_A and h_rx_B represent the antenna heights of base stations BS_A and BS_B, and TerrainType_AB represents the terrain type on the path between base stations BS_A and BS_B. Step B2-2: Calculate the signal power P_rx_AB received at base station BS_B from base station BS_A, as follows: P_rx_AB (dBm) = P_tx_A + G_tx_A + G_rx_B - L_p_AB Where P_tx_A represents the transmit power of base station BS_A, G_tx_A and G_rx_B represent the antenna gains of base stations BS_A and BS_B, respectively. Step B2-3, calculate the interference power I_A_on_B according to the interference type, as follows: When the interference type is co-channel interference, if: |f_A - f_B| < Δf_co but: I_A_on_B = P_rx_AB Where f_B represents the operating frequency of base station BS_B, and Δf_co is the co-channel determination bandwidth; When the interference type is adjacent channel interference, if: Δf_co ≤ |f_A - f_B| < Δf_adj but: I_A_on_B = P_rx_AB - ACIR_B Wherein, Δf_adj is the adjacent channel determination bandwidth, ACIR_B is the interference suppression capability of base station BS_B to the adjacent channel; Step B2-4, calculate the expected signal power P_desired_B received at base station BS_B, as follows: If the base station BS_B is communicating, the expected signal power P_desired_B is the received power of the mobile station it serves to the base station BS_B; If the base station BS_B is in the planning stage, the expected signal power P_desired_B is the minimum expected received power at the edge of its target coverage; Step B2-5, calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I), as follows: C / I_A_on_B (dB) = P_desired_B - I_A_on_B Considering the background noise P_noise_B, then: C / (N+I)_A_on_B (dB) = P_desired_B - 10*log10(10^(P_noise_B / 10) + 10^(I_A_on_B / 10)) Wherein, C / I_A_on_B and C / (N+I)_A_on_B are respectively the carrier-to-interference ratio C / I and the carrier-to-noise-plus-interference ratio C / (N+I) of base station BS_A to base station BS_B.

5. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 4, characterized in that: The coordination decision submodule is used to: Step C1: After receiving the interference warning, analyze the warning information; Step C2: Generate a coordination plan based on the preset coordination strategy; Step C3: Use the interference analysis and warning submodule to perform interference evaluation on the generated coordination plan, and select the optimal coordination plan based on the interference evaluation result; Step C4: convert the optimal coordination solution into an instruction and hand it over to the human-machine exchange and instruction issuing module for processing.

6. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 5, characterized in that: The coordination strategy described in step C2 includes: ZD Frequency Disturbance Rules CS1: If the interference source BS_source is not a ZD frequency user, immediately switch the interference source BS_source to an available coordination frequency XT or expansion frequency KR; if there is no available frequency, instruct the interference source BS_source to reduce the transmission power or temporarily shut down If the interference source BS_source is a ZD frequency user, report it immediately; Co-channel interference rule CS2: When the interference is greater than the threshold: If the interference source BS_source is a mobile base station or the preset priority is lower than the threshold, its frequency is adjusted to the XT or KR channel. The adjusted new frequency must pass the interference assessment; If the interfered base station BS_victim is a mobile base station or its preset priority is lower than the threshold, and the interference source BS_source cannot be adjusted, its frequency is adjusted to the XT or KR channel. The adjusted new frequency must pass the interference assessment. When the interference is less than the threshold: If the frequency resource is less than the threshold, the transmit power of the interference source BS_source is reduced until the interference is eliminated or the minimum allowed power is reached; If both the interference source BS_source and the interfered base station BS_victim are mobile base stations and the frequency adjustment measure is ineffective, increase the physical distance between them; Adjacent channel interference rule CS3: When the interference is greater than the threshold: Adjust the frequency of the interference source BS_source or the interfered base station BS_victim to an adjacent available channel with a larger separation from the other within the original frequency group; if this is ineffective, adjust it according to the co-channel interference rule CS2; Prompt to check the equipment parameters of the interfered base station BS_victim; Multiple Interference Source Rule CS4: Identify the interference source with the largest contribution and handle it according to the co-channel interference rule CS2 or the adjacent channel interference rule CS3.

7. A 370MHz emergency communication network frequency planning and interference coordination method, characterized in that: Using any of the systems described in claims 1 to 6 to perform frequency planning and interference coordination on a 370 MHz emergency communication network, the method comprises the following steps: Step 1: Initialization and data loading, as follows: Set up 370MHz frequency allocation planning table, frequency group definition, interference decision rules, GIS data and radio wave propagation model parameters; Step 2: Real-time collection and update of base station information, as follows: Receive status information reported by each deployed base station or pushed by the upper-level network management system, and update it in real time; Step 3: When a new base station needs to be deployed, process the frequency planning request for the new base station deployment; Step 4: Real-time interference analysis and warning, as follows: Perform interference calculations between all base stations in the emergency communication network, as well as between multiple base stations, according to a preset periodicity or triggered by preset conditions; If the interference value between any base stations exceeds the preset threshold, an interference warning message is generated; Step 5, interference coordination and decision execution, is as follows: Automatically generate a coordination plan based on interference warning information and preset coordination strategies; After the coordination plan passes manual review or modification, it is sent for execution and step 3 is executed simultaneously to update the emergency communication network; Step 6, status feedback and database update, as follows: After updating the emergency communication network, record the latest status information and perform visual analysis.

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