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

Abstract

The invention provides a 370MHz emergency communication network frequency planning and interference coordination system and method, and the system comprises an information collection and management module, a central coordination processing module, a database module, and a man-machine exchange and instruction issuing module. Wherein the information acquisition and management module is used for collecting and managing state information of all base stations in the emergency communication network; the central coordination processing module performs frequency planning, interference analysis prediction and coordination frequency decision according to the state information of all the base stations, and generates a corresponding decision instruction; the database module is used for storing data required by system operation; the man-machine exchange and instruction issuing module is used for providing a visual interface, displaying system information for an operator to operate, and issuing the decision instruction generated by the central coordination processing module to the outside; the method adopts the system to realize frequency planning and interference coordination of the emergency communication network.

Description

Technical Field

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

[0002] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Natural disasters pose extremely high requirements for emergency communication guarantee. It has been clearly stated to build a dedicated narrowband wireless communication network for emergency command using the 370 MHz frequency band, adopting the PDT digital trunking system. This network aims to be "vertically and horizontally connected" and serves as a backup voice communication means for emergency communication command.

[0004] In the prior art, "Frequency Planning for Narrowband Wireless Communication for Emergency Command" (hereinafter referred to as: Frequency Planning) has preliminarily divided the frequencies for fixed base stations and mobile base stations, and reserved expansion frequencies (KR), coordination frequencies (XT), and reserved frequencies for major events (ZD). Its planning principles include avoiding third-order intermodulation and adjacent-channel interference, and stipulating the minimum frequency interval for the same station (not less than 300 kHz for fixed stations and not less than 50 kHz for mobile stations) and the minimum distance between co-frequency base stations in different locations (not less than 80 km). In addition, the "General Technical Specification for Narrowband Wireless Communication Network for Emergency Command" (hereinafter referred to as: Technical Specification) issued separately defines the system architecture, technical system, interface specifications, etc.

[0005] However, in actual rescue operations, especially when a major disaster causes widespread communication paralysis, the established fixed base station network will be fully activated, and at the same time, a large number of mobile base stations (such as vehicle-mounted and backpack-mounted) will be dynamically deployed to key areas according to rescue needs.

[0006] The existing problems and disadvantages are mainly reflected in: Most of the existing frequency planning is regional static allocation, which is difficult to adapt to the dynamic frequency requirements and complex electromagnetic environment brought about by the simultaneous deployment of mobile base stations by a large number of rescue teams on a large scale and across regions.

[0007] In the case of the temporary and rapid deployment of a large number of mobile base stations, without effective real-time frequency coordination, it is extremely easy to generate co-frequency and adjacent-channel interference in the "last mile" or the core rescue area, affecting the command and dispatch efficiency and even causing communication interruption.

[0008] Traditionally relying on manual or offline tools for frequency assignment and interference troubleshooting has a slow response speed and cannot meet the immediacy requirements for communication establishment in emergency scenarios.

[0009] 4. Lack of intelligent coordination means may lead to tension in some frequency resources, while some other frequencies are not effectively utilized in a specific time and space, especially in the use of coordination frequencies (XT) and expanded capacity frequencies (KR).

[0010] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0011] Object of the Invention: The technical problem to be solved by the present invention is to provide a 370 MHz emergency communication network frequency planning and interference coordination system and method in view of the deficiencies of the prior art.

[0012] To solve the above technical problem, the present invention discloses a 370 MHz emergency communication network frequency planning and interference coordination system and method. The system includes: An information collection and management module, a central coordination and processing module, a database module, and a human-computer interaction and instruction issuing 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 and processing module, based on the status information of all base stations, conducts frequency planning, interference analysis and prediction, and coordination frequency decision-making, and generates corresponding decision instructions; The database module is used to store the data required for the operation of the system; The human-computer interaction and instruction issuing module is used to provide a visual interface, display system information and allow operators to perform operations, and issue the decision instructions generated by the central coordination and processing module externally.

[0013] Further, the information collection and management module includes: Connect to emergency command centers at all levels, network management systems or base stations to collect the basic information, location information, and working parameters of the base stations in the emergency communication network; wherein, the basic information includes: base station ID, base station type, and the area to which the base station belongs; the base station location information includes the longitude and latitude coordinates of the base station; the base station working parameters include: the currently used frequency, channel number, transmission power, antenna parameters, working mode, and current service load; And import the preset frequency allocation table and frequency grouping.

[0014] Further, the central coordination and processing module includes: A dynamic frequency planning sub-module, an interference analysis and early warning sub-module, and a coordination decision-making sub-module; wherein, The dynamic frequency planning sub-module conducts frequency planning for the base stations and allocates the optimal working frequencies for each base station; The interference analysis and early warning sub-module calculates the potential co-channel or adjacent-channel interference levels between any two or more base stations and issues interference early warnings. The coordination decision-making sub-module makes coordination decisions based on the interference early warnings and adjusts the base stations.

[0015] Furthermore, the dynamic frequency planning sub-module includes: When there is a new base station deployment request, frequency planning for the new base station is performed according to the new base station deployment request and the information of the already deployed base stations in the surrounding area, in combination with the preset static planning scheme and the currently available frequency resources. Among them, the specific method for performing frequency planning for the new base station is as follows: Step A1, information extraction and initialization, which is specifically as follows: Extract the predetermined 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 already deployed base stations BS_existing within the preset area D_scan from the database module, including: location, type, currently used 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 within each frequency group in the preset static planning scheme. Step A2, candidate frequency iteration and evaluation, traverse each frequency group in the order of the frequency group priority S_priority, and perform iterative selection of candidate frequencies f_candidate for the available channel list CH_avail within the group, that is, for each candidate frequency f_candidate, execute the screening rules. Step A3, select the best operating frequency according to the results of executing the screening rules, 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 the preset strategy. Step A4, ZD frequency processing, when performing frequency planning for the new base station, avoid assigning ZD frequencies.

[0016] Furthermore, the screening rules described in Step A2 are specifically as follows: Third-order intermodulation avoidance rule R1, for a new base station with a multi-channel configuration, the candidate frequency f_candidate and the channel combinations planned to work simultaneously on this base station will not generate harmful third-order intermodulation products that fall into the receiving frequency band. Minimum co-site and different-site frequency interval rule R2. If the new base station has a multi-channel configuration, the interval between the candidate frequency f_candidate and other selected channels of this base station shall be no less than the preset minimum co-site frequency interval; Minimum geographical 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 within the preset area D_scan, the geographical distance between the new base station P_new and this deployed base station BS_existing shall be no less than the preset minimum geographical 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, determine whether the candidate frequency f_candidate meets the expected coverage requirement at this frequency point, and consider the signal strength; Pre-interference evaluation rule R5. Using the candidate frequency f_candidate as the test frequency, calculate 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 after the deployment of the new base station P_new, and ensure that they are all greater than the preset interference decision threshold; Furthermore, the specific method for the interference analysis and early warning sub-module to conduct interference analysis and early warning includes: Step B1. Let the two base stations to be analyzed be base station BS_A and base station BS_B respectively. Obtain their status parameters from the database module, including: location coordinates, operating frequency, transmit power, antenna parameters, and receiver sensitivity; and preset parameters, including: radio wave propagation model, interference decision threshold, and adjacent channel interference suppression ratio; Step B2. Calculate the interference level, that is, calculate the potential interference of base station BS_A to base station BS_B, that is, the carrier-to-interference ratio C / I or carrier-to-noise-plus-interference ratio C / (N + I) of base station BS_A to base station BS_B; Step B3. Conduct interference early warning determination, that is, if the potential interference of base station BS_A to base station BS_B is less than the threshold, it is determined that there is potential interference of base station BS_A to base station BS_B, and an interference early warning is generated; Step B4. Calculate the interference early warning between multiple base stations, specifically as follows: For the case of multiple interference sources to 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; Subsequently, replace the potential interference of base station BS_A on base station BS_B in step 2 with the total interference power I_total_on_B, execute steps B2 to B3, calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I), and perform interference early warning.

[0017] Furthermore, the calculation described in step B2 for the potential interference of base station BS_A on base station BS_B specifically includes: Step B2-1, path loss calculation, specifically as follows: Calculate the geographical distance d_AB as follows: d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B) where CalculateDistance represents calculating the distance based on coordinates; According to the geographical distance d_AB, calculate the path loss L_p_AB 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 station BS_A and base station BS_B, and TerrainType_AB represents the terrain type on the path between base station BS_A and base station BS_B; Step B2-2, calculate the signal power P_rx_AB received by base station BS_B from base station BS_A, specifically as follows: P_rx_AB (dBm) = P_tx_A + G_tx_A + G_rx_B - L_p_AB where P_tx_A represents the transmission power of base station BS_A, and G_tx_A and G_rx_B represent the antenna gains of base station BS_A and base station BS_B respectively; Step B2-3, calculate the interference power I_A_on_B according to the interference type, specifically as follows: When the interference type is co-channel interference, if: |f_A - f_B| < Δf_co Then: 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 Then: I_A_on_B = P_rx_AB - ACIR_B Where Δf_adj is the adjacent channel determination bandwidth, and ACIR_B is the interference suppression ability of base station BS_B to the adjacent channel; Step B2-4, calculate the received desired signal power P_desired_B at base station BS_B, specifically as follows: If base station BS_B is in communication, the desired signal power P_desired_B is the received power from the mobile station it serves to base station BS_B; If base station BS_B is in the planning stage, the desired signal power P_desired_B is the minimum desired 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), specifically 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)) Where C / I_A_on_B and C / (N+I)_A_on_B are 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 respectively.

[0018] Furthermore, the coordination decision sub-module includes: Step C1, after receiving the interference warning, parse the warning information; Step C2, generate a coordination plan according to the preset coordination strategy; Step C3, use the interference analysis and warning sub-module to evaluate the generated coordination plan, and select the optimal coordination plan according to the interference evaluation result; Step C4, convert the optimal coordination plan into an instruction and hand it over to the human-machine interaction and instruction issuing module for processing.

[0019] Furthermore, the coordination strategy in step C2 includes: ZD frequency interference rule CS1: If the interfering source BS_source is a non-ZD frequency user, immediately switch the interfering source BS_source to an available coordinated frequency XT or an expanded frequency KR; if there is no available frequency, instruct the interfering source BS_source to reduce the transmission power or temporarily shut down. If the interfering 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 interfering source BS_source is a mobile base station or the preset priority is lower than the threshold, adjust its frequency to the XT or KR channel, and this new frequency needs to pass interference evaluation. If the interfered base station BS_victim is a mobile base station or the preset priority is lower than the threshold, and the interfering source BS_source cannot be adjusted, adjust its frequency to the XT or KR channel, and this new frequency needs to pass interference evaluation. When the interference is less than the threshold: If the frequency resource is less than the threshold, reduce the transmission power of the interfering source BS_source until the interference is eliminated or the minimum allowable power is reached. If both the interfering source BS_source and the interfered base station BS_victim are mobile base stations and the foregoing measures are 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 interfering source BS_source or the interfered base station BS_victim within the original frequency group to an adjacent available channel with a greater interval from the other party; if ineffective, adjust it with reference to the co-channel interference rule CS2. Prompt to check the equipment parameters of the interfered base station BS_victim. Multi-interfering-source rule CS4: Identify the interfering source with the greatest contribution and process it according to the co-channel interference rule CS2 or the adjacent-channel interference rule CS3.

[0020] The present invention also proposes a 370 MHz emergency communication network frequency planning and interference coordination method. Using the foregoing system, perform frequency planning and interference coordination on the 370 MHz emergency communication network, including the following steps: Step 1, initialization and data loading, specifically as follows: Set the 370 MHz frequency allocation planning table, frequency group definition, interference judgment rule, GIS data, and radio wave propagation model parameters. Step 2, real-time collection and update of base station information, specifically as follows: Receive the status information reported by each deployed base station or pushed by the superior 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 early warning, specifically as follows: Triggered according to a preset period or preset conditions, calculate the interference between all base stations in the emergency communication network pairwise and among multiple base stations. If it is found that the interference value between any base stations exceeds the preset threshold, generate interference early warning information. Step 5: Interference coordination and decision execution, specifically as follows: According to the interference early warning information, combined with the preset coordination strategy, automatically generate a coordination plan. After the coordination plan is manually reviewed or modified, send it for execution, and at the same time execute Step 3 to update the emergency communication network. Step 6: Status feedback and database update, specifically as follows: After updating the emergency communication network, record the latest status information and conduct visual analysis.

[0021] Beneficial effects

[0022] 1. In response to the suddenness and uncertainty of mobile base stations in emergency scenarios, the present invention can dynamically plan and allocate frequencies in real time, quickly respond to deployment requirements, ensure the smooth communication of the "last mile", and is significantly superior to traditional static plans.

[0023] 2. The present invention predicts and actively coordinates interference by integrating multi-dimensional information (base station parameters, GIS, propagation model), effectively reducing the co-channel / adjacent-channel interference between fixed and mobile base stations and between mobile base stations, and improving the stability and reliability of communication links.

[0024] 3. The present invention can intelligently schedule frequency groups with different attributes such as Yd, XT, KR, and ZD, dynamically adjust according to actual needs and interference situations, and significantly improve the utilization efficiency of 370 MHz spectrum resources, especially in large-scale emergency responses.

[0025] 4. The present invention provides visual situations and intelligent suggestions, reduces the dependence on manual experience, improves the decision-making efficiency and deployment speed of emergency communication guarantee, and enhances the communication guarantee ability of multi-team collaborative operations. Description of the drawings

[0026] The following further specifically describes the present invention in conjunction with the drawings and specific embodiments, and the above and / or other advantages of the present invention will become clearer.

[0027] Figure 1 It is a schematic diagram of the system architecture of the present invention.

[0028] Figure 2Schematic diagram of the method of the present invention.

[0029] Figure 3 Schematic diagram of human-machine interface interaction.

[0030] Figure 4 Schematic diagram of interference analysis. Detailed implementation manners

[0031] The present invention provides a 370MHz emergency communication network frequency planning and interference coordination system and method, which is used to realize dynamic and real-time frequency planning and allocation in emergency scenarios, especially for temporarily deployed mobile / backpack base stations. It can effectively predict, identify and coordinate potential frequency interferences, reduce the interference risks between fixed base stations and mobile base stations, and between mobile base stations. Improve the utilization efficiency of 370MHz frequency resources and the overall performance of the emergency communication network. Support rapid response and deployment, and provide stable and reliable narrowband voice communication guarantee for emergency command. The overall technical solution idea of the present invention is as follows: 1. System level Set up an information module: used to collect and manage dynamic parameters such as the positions and frequencies of fixed and mobile base stations in real time (compatible with JSON format) Set up a central processing module: including three core functions of dynamic frequency planning, interference analysis and early warning, and coordination decision-making.

[0032] Set up a database: store static planning data (including Gd / Yd / XT / KR / ZD frequency group definitions), real-time network status and GIS data.

[0033] Set up an interaction module: provide visual operation and instruction issuance.

[0034] 2. Method level Adopt the dynamic frequency allocation method: for newly deployed (especially mobile) base stations, it can be based on Adopt the real-time network environment, preset frequency group strategies (Yd priority, XT coordination, etc.) and interference avoidance principles (minimum frequency interval, geographical reuse), and automatically recommend and allocate operating frequencies.

[0035] Adopt the active interference early warning and coordination method: based on multi-dimensional information (base station parameters, GIS, propagation model), predict and quantify potential interferences in real time, trigger an alarm when exceeding the limit, and intelligently generate a coordination plan including measures such as frequency adjustment (such as switching to the XT / ZD group) and power control.

[0036] Adopt a closed-loop processing flow: form a closed loop from information collection, dynamic planning / interference analysis, plan generation, instruction issuance to status feedback, and realize continuous optimization and adaptive adjustment.

[0037] The specific technical solution of the present invention is as follows: The system, as Figure 1 shown, mainly includes: an information collection and management module, a central coordination and processing module, a database module, and a human-machine interaction and instruction issuing module.

[0038] 1. Information collection and management module Responsible for collecting and managing the real-time or near-real-time status information of all fixed base stations and mobile / backpack base stations in the network. Collect the basic information of the base station (base station ID, base station type, affiliated area), the location information of the base station (latitude and longitude coordinates), the operating parameters of the base station (currently used frequency, channel number, transmission power, antenna parameters, operating mode, current service load, etc.), and import the national frequency allocation table and frequency grouping plan in the "Frequency Planning". Connect to emergency command centers at all levels, network management systems or directly to base stations with reporting functions through wired / wireless means.

[0039] 2. Central coordination and processing module The core of the system, which executes frequency planning algorithms, interference analysis and prediction, and coordination decision-making. It is divided into 3 sub-modules: Module 1: Dynamic frequency planning sub-module When receiving a deployment request for a new base station (e.g., a mobile / backpack base station), its workflow is as follows: 1) Information extraction and initialization: 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 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 priority (S_priority = {Yd_local, XT, KR, Gd_idel}) and the available channel list (CH_avail) within each frequency group.

[0040] 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: * Rule R1 (Third-order intermodulation avoidance): For mobile base stations with multi-channel configurations, ensure that f_candidate and the channel combinations that are planned to work simultaneously on this base station will not generate harmful third-order intermodulation products that fall into the receiving frequency band.

[0041] Application steps of R1: Assume that the new base station is planned to be configured with N channels. Currently, the frequency f_candidate is being selected for the K-th channel (1 ≤ k ≤ N), and the frequencies f_1, f_2, ..., f_{k - 1} have been selected for the previous k - 1 channels.

[0042] (1) Construct frequency combinations: Combine f_candidate with f_1, f_2, ..., f_{k - 1} that have been selected for this base station. Check pairwise. For each selected frequency f_i (i < k), calculate the third-order intermodulation products generated by f_candidate and f_i: f_imp1 = 2 * f_candidate - f_i f_imp2 = 2 * f_i - f_candidate (2) Determine the receiving frequency band: Obtain the receiving frequency range (Rx_Band_Start, Rx_Band_End) of this base station.

[0043] (3) Harmfulness judgment: For each calculated intermodulation product frequency f_imp: Judge whether it falls into the receiving frequency band, and check Rx_Band_Start ≤ f_imp ≤ Rx_Band_End.

[0044] (4) Rule verification result: If any calculated f_imp is judged to be harmful, the current f_candidate does not meet rule R1 and should be excluded.

[0045] If all calculated f_imp do not fall into the receiving frequency band or its actual receiving channels, or their estimated intensities are much lower than the receiver sensitivity, then f_candidate passes the rule R1 verification.

[0046] * Rule R2 (Minimum co - site / co - channel frequency separation) If the new base station is configured with multiple channels, the separation between f_candidate and other selected channels of this base station should be not less than the preset minimum co - site frequency separation (for example, 50 kHz for mobile stations).

[0047] The frequency separation between f_candidate and f_used used by any BS_existing within the surrounding D_scan range should satisfy: If BS_existing is a fixed station, the separation >= 300 kHz.

[0048] If BS_existing is a mobile station, the interval >= 50 kHz.

[0049] If BS_existing and the new base station are of different types (one fixed and one mobile), the interval >= the preset hybrid safety threshold (e.g., 150 kHz).

[0050] * Rule R3 (Minimum geographical reuse distance): If f_candidate and f_used used by any BS_existing within the D_scan range are of the same frequency, the geographical distance between the new base station P_new and this BS_existing should be no less than the preset minimum geographical reuse distance (e.g., 80 km).

[0051] * Rule R4 (Expected coverage and signal strength compatibility): Based on the terrain features of R_new and P_new, preliminarily judge whether f_candidate can meet the basic coverage expectations at this frequency point, and consider the signal strength.

[0052] * Rule R5 (Pre-interference assessment): Invoke the assessment logic of the interference analysis and warning sub-module. Using f_candidate as the test frequency, calculate the potential C / I or C / (N+I) between the new base station deployed at the P_new location and all BS_existing within the D_scan range, as well as the impact on BS_existing. Ensure that the predicted C / I or C / (N+I) is greater than the preset interference decision threshold.

[0053] 1) Optimal operating frequency selection: Select the first f_candidate that passes all the checks of Rules R1 - R5 as the recommended optimal operating frequency.

[0054] Optional optimization: If there are multiple f_candidates passing the checks, they can be further selected according to the following strategies: Strategy O1 (Largest interference margin): Select the f_candidate with the largest predicted C / I or C / (N+I) margin in Rule R5.

[0055] Strategy O2 (Load balancing): If the system has the ability to statistically analyze frequency load, select the f_candidate with the lowest historical occupancy or real-time traffic volume in the current area (or within the affiliated frequency group).

[0056] 2) ZD frequency processing: For the reserved frequency (ZD) for major emergencies at the ministerial dispatching level, it does not participate in the above automatic planning process. Its use is uniformly assigned by the highest command agency according to the emergency response level and requirements. This module should avoid assigning the ZD frequency during planning and ensure that the communication of the ZD frequency is not affected during interference analysis.

[0057] Module 2: Interference Analysis and Early Warning Sub-module The working method is as follows: 1) Parameter Definition and Acquisition For any two base stations BS_A (potential interference source or affected object) and BS_B (potential affected object or interference source), obtain their status parameters from the database module: Location coordinates: (Lat_A, Lon_A), (Lat_B, Lon_B) Operating frequency: f_A, f_B (center frequency) Transmit power: P_tx_A (dBm) Antenna parameters: antenna gains G_tx_A, G_rx_B (dBi); antenna heights h_tx_A, h_rx_B (m); antenna radiation pattern.

[0058] Receiver sensitivity: S_rx_B (dBm) or noise floor P_noise_B (dBm).

[0059] Preset parameters: Radio wave propagation model (M_prop): such as Okumura-Hata, Longley-Rice or a model optimized for specific terrain. This model calculates the path loss L_p (dB) based on frequency, distance, antenna height, and terrain type (obtained from GIS data).

[0060] 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).

[0061] Adjacent channel interference rejection ratio (ACIR_B): the interference rejection ability of base station B for adjacent channels (dB).

[0062] 2) Interference level calculation (for the potential interference of BS_A on BS_B): Step 2.1 (Path loss calculation): Geographical distance d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B).

[0063] The path loss L_p_AB = M_prop(f_A, d_AB, h_tx_A, h_rx_B, TerrainType_AB).

[0064] Step 2.2 (Signal power P_rx_AB received at BS_B from BS_A): P_rx_AB (dBm) = P_tx_A + G_tx_A + G_rx_B - L_p_AB.

[0065] Step 2.3 (Interference type judgment and interference power I_A_on_B calculation): Co-channel interference (CCI): If |f_A - f_B| < Δf_co (Δf_co is the co-channel determination bandwidth, such as 1 kHz), then I_A_on_B = P_rx_AB.

[0066] Adjacent-channel interference (ACI): If Δf_co ≤ |f_A - f_B| < Δf_adj (Δf_adj is the adjacent-channel determination bandwidth, such as 25 kHz), then I_A_on_B = P_rx_AB - ACIR_B.

[0067] Other remote interference: Can be ignored in this model.

[0068] Step 2.4 (Desired signal power P_desired_B 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.

[0069] Step 2.5 (Carrier-to-interference ratio C / I or carrier-to-noise-plus-interference ratio C / (N+I) calculation): C / I_A_on_B (dB) = P_desired_B - I_A_on_B。

[0070] If considering the background noise: 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))。

[0071] 3) Interference early warning determination If C / I_A_on_B < C / I_req (or C / (N+I)_A_on_B < C / (N+I)_req), it is determined that there is potential interference from BS_A to BS_B, and an interference early warning is generated.

[0072] 4) Module application scenario "Pre-interference assessment" takes the newly deployed base station as BS_A, the candidate frequency as f_A, and the surrounding deployed base stations as BS_B, and performs the above calculations to ensure that the new frequency will not cause unacceptable interference to the existing network and that the new base station itself will not be overly interfered with by the existing base stations.

[0073] "Does not meet the interference-free condition": When the dynamic frequency planning sub-module attempts all available channels in a certain frequency group (such as group Yd) for "pre-interference assessment", if all channels result in the calculated C / I (or C / (N+I)) < the corresponding threshold, it is determined that this frequency group "does not meet the interference-free condition".

[0074] "Interference calculation": Triggered periodically by the system (such as every N minutes) or when any significant change occurs in the status (location, frequency, power) of any base station, the above interference level calculation is performed on all base station pairs (BS_i, BS_j) that may affect each other in the network.

[0075] 5) Interference between multiple base stations For the case where multiple interfering sources affect a single victim object, 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 interfering source on BS_B. Subsequently, C / I or C / (N+I) is calculated using I_total_on_B.

[0076] Module 3: Coordination decision-making sub-module After receiving the interference warning from the interference analysis and early warning sub-module, its workflow and coordination plan generation logic are as follows: (1) Warning information parsing: Extract the key information of the interference warning, including: interfering source base station (BS_source), victim base station (BS_victim), interference type (T_interf: co-channel CCI, adjacent-channel ACI, etc.), interference severity (S_interf: such as the difference ΔC / I between the C / I value and the threshold), and the importance of the affected service (P_service: such as whether it involves the command link, ZD frequency, etc.).

[0077] (2) Definition of coordination strategy priorities: P0 (highest): Guarantee absolute priority for ZD frequency communication, and any interference to the ZD frequency must be coordinated immediately.

[0078] P1: Guarantee the core emergency command link (which can be pre-marked or dynamically identified).

[0079] P2: Prioritize adjusting the base stations that are easier to adjust (such as: mobile base stations prior to fixed base stations, non-critical service base stations prior to critical service base stations).

[0080] P3: Prioritize the coordination measures with the least cost (e.g., small power adjustment takes precedence over frequency change, and frequency change takes precedence over physical relocation).

[0081] P4: After coordination, re - conduct interference assessment to ensure that the new plan does not introduce new severe interference.

[0082] (3) Coordination plan generation rule set: * Rule CS1 (ZD frequency disturbed): Action A1.1: If BS_source is not a ZD - frequency user, immediately try to switch BS_source to an available coordination frequency XT or expansion frequency KR. If there is no available frequency, instruct BS_source to significantly reduce the transmission power or temporarily shut down.

[0083] Action A1.2: If BS_source is also a ZD - frequency user, immediately report to the highest command authority for adjudication.

[0084] * Rule CS2 (Co - channel interference CCI): Prerequisite: ΔC / I is large (severe interference).

[0085] Action A2.1 (Adjust the interfering source): If BS_source is a mobile base station or has a lower priority, try to adjust its frequency to an available XT or KR channel. The new frequency needs to pass the pre - interference assessment.

[0086] Action A2.2 (Adjust the victim): If BS_victim is a mobile base station or has a lower priority and it is difficult to adjust BS_source, try to adjust its frequency to an available XT or KR channel. The new frequency needs to pass the pre - interference assessment.

[0087] Action A2.3 (Power control): If ΔC / I is small and frequency resources are tight, try to gradually reduce the transmission power of BS_source until the interference is eliminated or the minimum allowable power is reached.

[0088] Action A2.4 (Physical relocation suggestion): If both BS_source and BS_victim are mobile base stations and the above measures are ineffective or infeasible, suggest increasing the physical distance between them.

[0089] * Rule CS3 (Adjacent - channel interference ACI): Prerequisite: ΔC / I is large.

[0090] Action A3.1 (Increase Frequency Separation): If there is an adjustable range for BS_source or BS_victim, attempt to adjust its frequency to an adjacent available channel with a greater separation from the other party (still within the original frequency group or XT / KR group).

[0091] Action A3.2 (Frequency Adjustment and Power Control Referencing CS2): If A3.1 is ineffective, then refer to the frequency adjustment and power control actions in CS2.

[0092] Action A3.3 (Check Equipment Parameters): Prompt to check whether the adjacent channel selectivity of BS_victim or the out-of-band leakage of BS_source complies with the specifications.

[0093] * Rule CS4 (Multiple Interference Sources): Action A4.1: Identify the main interference source (the one with the greatest contribution), and preferentially process the main interference source according to CS2 or CS3.

[0094] Action A4.2: If there is no single main interference source, or there is still interference after processing, then comprehensively consider adjusting the frequencies or powers of multiple secondary interference sources.

[0095] (4)Coordination Plan Evaluation and Selection: For each generated candidate coordination plan, call the interference analysis and early warning sub-module for "post-effect evaluation" to predict the network interference situation after implementing the plan.

[0096] Select one or more (sorted by recommendation degree) plans that can effectively eliminate or significantly reduce the current interference and introduce the least new interference (or no new interference).

[0097] (5)Generate Coordination Instructions: Convert the selected coordination plan into specific instructions, such as: Instruction 1: "Base station ID [BS_source_ID], switch the operating frequency to channel number [New_Channel_Num]".

[0098] Instruction 2: "Base station ID [BS_source_ID], adjust the transmit power to [New_Power_Level] dBm".

[0099] Instruction 3: "Recommend that mobile base station ID [Mobile_BS_ID] migrate [Distance] kilometers in the [Direction] direction".

[0100] (6)Human-Machine Interaction and Issuance: Display the recommended coordination instructions and evaluation results to the operator through the human-machine interaction module, and the operator can review, modify, or directly confirm and issue them.

[0101] 3. Database Module Stores various types of data required for the operation of the storage system, including static data (national 370 MHz frequency allocation plan table, correspondence between channel numbers and specific frequencies of each frequency group (Gd, Yd, KR, XT, ZD), radio wave propagation model parameters, geographic information system data, interference decision rule library), and dynamic data (status information of each base station collected in real time, historical interference event records, current frequency occupancy status map, etc.).

[0102] 4. Human-Machine Interaction and Instruction Issuance Module Provides a visual interface for operators to monitor the network status, receive warnings, execute or adjust coordination instructions, as Figure 3 shown, and issues the final instructions to the relevant base stations or network management systems. Allows operators to manually input new deployed base station information, query the frequency usage in a specific area, confirm or modify the frequency planning scheme and interference coordination scheme recommended by the system. Through a predefined interface (issue instructions such as frequency adjustment and power control to the base station controller or base stations with remote configuration capabilities).

[0103] In addition, as Figure 2 shown, the method proposed by the present invention specifically includes the following steps: Step 1: Initialization and Data Loading When the system starts, load the national 370 MHz frequency allocation plan table, frequency group definition, interference decision rules, GIS data, and radio wave propagation model parameters from the database module.

[0104] Step 2: Real-Time Acquisition and Update of Base Station Information The information acquisition and management module continuously receives the status information (location, frequency, power, etc.) reported by each deployed fixed base station and mobile / backpack base station or pushed by the superior network management system, and updates it to the database module in real time. The information format follows the JSON specification.

[0105] Step 3: Processing of Frequency Planning Requests for New Base Station Deployment When a new mobile / backpack base station (or temporary fixed base station) needs to be deployed, the operator inputs the predetermined deployment location, type (such as backpack), expected coverage requirements, and optional antenna parameters of the base station through the human-machine interaction module. The central coordination processing module receives the request and the dynamic frequency planning sub-module is started.

[0106] Step 4: Dynamic Frequency Planning and Allocation The dynamic frequency planning sub-module queries the information of other existing base stations within a certain geographical range (such as a radius of 5 - 100 km, adjustable according to the base station type and power) at the predetermined location of the newly deployed base station in the database. Considering the following factors, select the best operating frequency: 1) Availability: Prioritize selection from the pre-allocated mobile frequency group Yd of this city. If the frequencies in group Yd do not meet the interference-free condition, consider using the coordinated frequency XT group. In special cases, with authorization, consider using the expanded frequency KR group or the Gd group frequencies not used by fixed stations in this area. During major disasters, the ministerial reserved ZD frequencies are uniformly dispatched and used by the highest command agency.

[0107] 2) Isolation: Ensure that the selected frequencies and the frequencies of surrounding existing base stations meet the minimum co-site / co-channel frequency separation requirements (>=300 kHz between fixed stations, >=50 kHz between mobile stations) and the geographical reuse distance requirements (such as 80 km).

[0108] 3) Interference prediction: Use the interference analysis and warning sub-module to perform pre-interference assessment on candidate frequencies and select the frequency with the least interference.

[0109] 4) Load balancing (optional): If there are multiple available frequencies, consider selecting the frequency with a lower occupancy in the current area.

[0110] The final planning results (recommended frequencies, power suggestions, etc.) are presented to the operator for confirmation through the human-machine interaction module.

[0111] Step 5: Real-time interference analysis and warning As Figure 4 shown, the interference analysis and warning sub-module periodically (or is triggered when any base station status changes) calculates the interference between all pairs of base stations and among multiple base stations in the network. If it is found that the calculated interference value between any base stations exceeds the preset threshold, an interference warning is generated and sent to the operator through the human-machine interaction module, indicating the interference source, the affected object, and the interference type.

[0112] Step 6: Interference coordination and decision execution The coordination decision sub-module automatically generates one or more coordination plans (such as adjusting frequencies, reducing power, adjusting antennas, etc.) according to the received interference warning and in combination with the preset coordination strategies (such as priority, cost-benefit, etc.); the coordination plan is submitted to the operator for review through the human-machine interaction module, and the operator can choose to accept the system-recommended plan or make modifications; the confirmed coordination instruction is transmitted to the control system or network management system of the target base station for execution through the instruction issuing interface; if the coordination involves frequency changes, part of the logic in Step 4 needs to be re-executed to ensure the applicability of the new frequencies.

[0113] Step 7: Status feedback and database update After the base station executes the coordination instruction, it reports its latest status information; the system records the operations and results of this frequency planning or interference coordination and updates the status of relevant base stations and the frequency occupancy map in the database.

[0114] Embodiment 1: Frequency Planning for Rapid Deployment of Mobile Backpack Base Stations A debris flow disaster occurred in a mountainous area, and the public network communication was interrupted. A rescue team carried a backpack PDT self-organizing network base station (with the ability of 3 hops and 4 nodes) into the core area of the disaster area.

[0115] 1. Information collection: The commander of the rescue team inputs the longitude and latitude of the predetermined erection point A of the backpack base station, the base station type is "backpack - Yd priority", and the expected coverage radius is 1 km through a handheld terminal (integrated with the function of the human-computer interaction module). The static planning data of the fixed base stations in the Gd group of this province and the real-time information of a small number of activated fixed base stations already exist in the system.

[0116] 2. Planning request: The information is submitted to the central coordination and processing module deployed in the rear command post through a wireless link (such as a satellite or a nearby temporary public network access point).

[0117] 3. Frequency planning: The dynamic frequency planning sub-module queries that there is no other used 370 MHz frequency within 20 km around point A. Taking the Yd1 group frequency of this province (such as channel numbers 8 / 103 / 208) as the first choice, channel number 8 (372.1000 / 382.1000 MHz) is selected and assigned to this backpack base station. At the same time, the initial transmit power level (such as 5W) is recommended.

[0118] 4. Result feedback: The planning result (channel number 8, power recommendation) is 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 information of this backpack base station.

[0119] Embodiment 2: Interference Warning and Coordination in the Scenario of Multiple Base Stations Coexisting During the earthquake rescue, the fixed base station group Gd2 (channel numbers 51 / 139) has been enabled in City A according to the plan. An emergency communication vehicle (mobile base station) dispatched by the neighboring County B (planned to use the Yd2 group, including channel numbers 21 / 125 / 260) is set up at point C at the junction of City A and County B, and channel number 21 of the Yd2 group is used. At the same time, a backpack base station D of another provincial support team is deployed near point C. To quickly establish communication, it also tries to use the idle channel number 125 of the Yd2 group.

[0120] 1. Information update and interference analysis: The information of each base station (including the positions and used frequencies of the mobile base station at point C and the backpack base station at point D) is reported to the system. The interference analysis and warning sub-module calculates and finds that due to the close geographical location and small frequency interval (channels 21 and 125) between the base stations at points C and D, there may be a certain risk of adjacent channel interference or intermodulation interference. At the same time, there may be a weak co-channel interference in a specific direction between the edge of the coverage area of the base station at point D and a certain edge coverage area of the Gd2 fixed base station in City A (if the actual used frequency of point D conflicts with Gd2).

[0121] 2. Warning and Decision-making: The system highlights points C and D on the human-machine interface and issues an interference warning. The coordination decision-making sub-module analyzes that the distance between points C and D is too close, and recommends switching the frequency of the base station at point D. Querying the database, it is found that channel number 122 (373.5250 / 383.5250 MHz) in the coordination frequency XT group is available in the current area and has good isolation from other base stations.

[0122] 3. Coordination Execution: The system recommends adjusting the frequency of the backpack base station at point D to channel number 122. After the operator confirms, the instruction is sent wirelessly to the D base station for adjustment. After the adjustment, the system re-evaluates the interference and confirms that the risk is lifted.

[0123] In a specific implementation, the present application provides a computer storage medium and a corresponding data processing unit. Among them, the computer storage medium can store a computer program, and when the computer program is executed by the data processing unit, it can run the invention content of a 370 MHz emergency communication network frequency planning and interference coordination system and method provided by the present invention and some or all of the steps in each embodiment. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0124] Those skilled in the art can clearly understand that the technical solutions in the embodiments of the present invention can be implemented by means of a computer program and its corresponding general hardware platform. Based on such an understanding, the essence of the technical solutions in the embodiments of the present invention, or the part that contributes to the prior art, can be embodied in the form of a computer program, that is, a software product. The computer program software product can be stored in a storage medium, including several instructions for causing a device (which can be a personal computer, a server, a single-chip microcomputer, an MCU, or a network device, etc.) containing a data processing unit to execute the methods described in each embodiment or some parts of the embodiments of the present invention.

[0125] The present invention provides an idea and method for a 370 MHz emergency communication network frequency planning and interference coordination system and method. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented by the prior art.

Claims

1. A 370MHz emergency communication network frequency planning and interference coordination system, characterized in that It includes: An information collection and management module, a central coordination and processing module, a database module, and a human-machine interaction and instruction distribution 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 and processing module, based on the status information of all base stations, conducts frequency planning, interference analysis and prediction, and coordinated frequency decision-making, and generates corresponding decision instructions; The database module is used to store the data required for system operation; The human-machine interaction and instruction distribution module is used to provide a visual interface, display system information and allow operators to operate, and distribute the decision instructions generated by the central coordination and processing module externally.

2. The 370MHz emergency communication network frequency planning and interference coordination system according to claim 1, wherein The information collection and management module described above includes: Connect to emergency command centers at all levels, network management systems or base stations, and collect the basic information, location information, and working parameters of base stations in the emergency communication network; among them, the basic information includes: base station ID, base station type, and the area to which the base station belongs; the base station location information includes the longitude and latitude coordinates of the base station; the base station working parameters include: the currently used frequency, channel number, transmission power, antenna parameters, working mode, and current service load; And import the preset frequency allocation table and frequency grouping.

3. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 2, characterized in that, The central coordination and processing module described above includes: A dynamic frequency planning sub-module, an interference analysis and early warning sub-module, and a coordinated decision-making sub-module; among them, The dynamic frequency planning sub-module conducts frequency planning for base stations and allocates the best working frequencies for each base station; The interference analysis and early warning sub-module calculates the potential co-frequency or adjacent-frequency interference levels between any two or more base stations and conducts interference early warning; The coordinated decision-making sub-module conducts coordinated decision-making based on the interference early warning and adjusts the base stations.

4. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 3, characterized in that, The dynamic frequency planning sub-module described above includes: When there is a new base station deployment request, according to the new base station deployment request and the information of the surrounding deployed base stations, combined with the preset static planning scheme and the current available frequency resources, conduct frequency planning for the new base station; Among them, the specific method for conducting frequency planning for the new base station is as follows: Step A1, information extraction and initialization, specifically as follows: Extract the predetermined position 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 stations BS_existing within the preset area D_scan from the database module, including: location, type, currently used frequency f_used, transmission power P_tx, and antenna parameters A_param; Load the frequency group priority S_priority and the available channel list CH_avail within each frequency group in the preset static planning scheme; Step A2, candidate frequency iteration and evaluation, traverse each frequency group in the order of the frequency group priority S_priority, and iteratively select candidate frequencies f_candidate from the available channel list CH_avail within the group, that is, for each candidate frequency f_candidate, execute the screening rules; Step A3, according to the result of executing the screening rules, select the optimal operating frequency. Select the first candidate frequency f_candidate that passes all the screening rules as the recommended optimal operating frequency, or when multiple candidate frequencies f_candidate pass all the screening rules, select the recommended optimal operating frequency according to a preset strategy; Step A4, ZD frequency processing. When performing frequency planning for a new base station, avoid assigning ZD frequencies.

5. A 370MHz emergency communication network frequency planning and interference coordination system according to claim 4, characterized in that, The screening rules described in Step A2 are specifically as follows: Third-order intermodulation avoidance rule R1. For a new base station with a multi-channel configuration, the candidate frequency f_candidate and the channel combinations that are planned to work simultaneously on this base station will not generate harmful third-order intermodulation products that fall into the receiving frequency band; Minimum co-site and co-channel frequency separation rule R2. If the new base station has a multi-channel configuration, the separation between the candidate frequency f_candidate and the other selected channels of this base station should not be less than the preset minimum co-site frequency separation; Minimum geographical reuse distance rule R3. If the candidate frequency f_candidate is the same frequency as the candidate frequency f_used used by any deployed base station BS_existing within the preset area D_scan, the geographical distance between the new base station P_new and this deployed base station BS_existing should not be less than the preset minimum geographical 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, determine whether the candidate frequency f_candidate meets the expected coverage requirement at this frequency point and consider the signal strength; Pre-interference evaluation rule R5. Using the candidate frequency f_candidate as the test frequency, calculate 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 after the new base station P_new is deployed, and ensure that they are all greater than the preset interference decision threshold.

6. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 5, characterized in that The specific methods for the interference analysis and early warning sub-module to perform interference analysis and early warning include: Step B1, set the two base stations to be analyzed as base station BS_A and base station BS_B respectively, and obtain their status parameters from the database module, including: location coordinates, operating frequency, transmit power, antenna parameters, and receiver sensitivity; and preset parameters, including: radio wave propagation model, interference decision threshold, and adjacent channel interference suppression ratio; Step B2, calculate the interference level, that is, calculate the potential interference of base station BS_A to base station BS_B, that is, the carrier-to-interference ratio C / I or carrier-to-noise-plus-interference ratio C / (N + I) of base station BS_A to base station BS_B; Step B3, perform interference early warning determination. That is, if the potential interference of base station BS_A to base station BS_B is less than the threshold, it is determined that there is potential interference of base station BS_A to base station BS_B, and an interference early warning is generated; Step B4, calculate the interference early warning between multiple base stations, specifically as follows: For the case of multiple interfering sources on base station BS_B, the total interference power I_total_on_B is calculated by power combination: I_total_on_B = 10*log10(Σ10^(I_k_on_B / 10)) where I_k_on_B is the interference power of the k-th interfering source on base station BS_B; Subsequently, use the total interference power I_total_on_B to replace the potential interference of base station BS_A on base station BS_B in step 2, and execute steps B2 to B3 to calculate the carrier-to-interference ratio C / I or the carrier-to-noise-plus-interference ratio C / (N+I) for interference warning.

7. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 6, characterized in that, The calculation described in step B2 for the potential interference of base station BS_A on base station BS_B specifically includes: Step B2-1, path loss calculation, specifically as follows: Calculate the geographical distance d_AB as follows: d_AB = CalculateDistance(Lat_A, Lon_A, Lat_B, Lon_B) where CalculateDistance represents calculating the distance according to coordinates; According to the geographical distance d_AB, calculate the path loss L_p_AB 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 station BS_A and base station BS_B, and TerrainType_AB represents the terrain type on the path between base station BS_A and base station BS_B; Step B2-2, calculate the signal power P_rx_AB received at base station BS_B from base station BS_A, specifically 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, and G_tx_A and G_rx_B represent the antenna gains of base station BS_A and base station BS_B respectively; Step B2-3, calculate the interference power I_A_on_B according to the interference type, specifically as follows: When the interference type is co-channel interference, if: |f_A - f_B| < Δf_co then: 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 then: I_A_on_B = P_rx_AB - ACIR_B where Δf_adj is the adjacent-channel determination bandwidth, and ACIR_B is the interference suppression ability of base station BS_B for adjacent channels; Step B2-4, calculate the desired signal power P_desired_B received at base station BS_B, specifically as follows: If base station BS_B is in communication, the desired signal power P_desired_B is the received power from the mobile station it serves to base station BS_B; If base station BS_B is in the planning stage, the desired signal power P_desired_B is the minimum desired received power at the edge of its target coverage; Step B2-5, calculate the carrier-to-interference ratio C / I or carrier-to-noise-plus-interference ratio C / (N+I), specifically 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)) Where, C / I_A_on_B and C / (N+I)_A_on_B are the carrier-to-interference ratio C / I and carrier-to-noise-plus-interference ratio C / (N+I) of base station BS_A to base station BS_B respectively.

8. A 370 MHz emergency communication network frequency planning and interference coordination system according to claim 7, characterized in that, The described coordination decision sub-module includes: Step C1, after receiving the interference warning, perform warning information analysis; Step C2, generate a coordination plan according to the preset coordination strategy; Step C3, use the interference analysis and warning sub-module to perform interference evaluation on the generated coordination plan, and select the optimal coordination plan according to the interference evaluation result; Step C4, convert the optimal coordination plan into an instruction and hand it over to the human-machine interaction and instruction issuing module for processing.

9. A 370MHz emergency communication network frequency planning and interference coordination system according to claim 8, characterized in that, The coordination strategy described in Step C2 includes: ZD frequency interference rule CS1: If the interfering source BS_source is a non-ZD frequency user, immediately switch the interfering source BS_source to an available coordination frequency XT or an expanded capacity frequency KR; if there is no available frequency, instruct the interfering source BS_source to reduce the transmission power or temporarily shut down If the interfering source BS_source is a ZD frequency user, immediately report it; Co-channel interference rule CS2: When the interference is greater than the threshold: If the interfering source BS_source is a mobile base station or the preset priority is lower than the threshold, adjust its frequency to the XT or KR channel, and this new frequency needs to pass the interference evaluation; If the interfered base station BS_victim is a mobile base station or the preset priority is lower than the threshold, and the interfering source BS_sourc cannot be adjusted, adjust its frequency to the XT or KR channel, and this new frequency needs to pass the interference evaluation; When the interference is less than the threshold: If the frequency resource is less than the threshold, reduce the transmission power of the interfering source BS_source until the interference is eliminated or the minimum allowable power is reached; If both the interfering source BS_source and the interfered base station BS_victim are mobile base stations and the foregoing measures are ineffective, then increase the physical distance between them; Adjacent-channel interference rule CS3: When the interference is greater than the threshold: Adjust the frequency of the interfering source BS_source or the interfered base station BS_victim within the original frequency group to an adjacent available channel with a greater interval from the other party; if it is ineffective, adjust it according to the co-channel interference rule CS2; Prompt to check the device parameters of the interfered base station BS_victim; Multi-interference source rule CS4: Identify the interference source with the greatest contribution and handle it according to the co-frequency interference rule CS2 or the adjacent-frequency interference rule CS3.

10. A frequency planning and interference coordination method for a 370 MHz emergency communication network, characterized in that, Adopt any of the systems described in claims 1-6 to perform frequency planning and interference coordination for the 370 MHz emergency communication network, including the following steps: Step 1, initialization and data loading, specifically as follows: Set the 370 MHz frequency allocation plan table, frequency group definition, interference judgment rules, GIS data, and radio wave propagation model parameters; Step 2, real-time collection and update of base station information, specifically as follows: Receive the status information reported by each deployed base station or pushed by the superior 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 early warning, specifically as follows: Trigger according to the preset period or preset conditions to calculate the interference between all base stations in the emergency communication network pairwise and among multiple base stations; If it is found that the interference value between any base stations exceeds the preset threshold, generate an interference early warning message; Step 5, interference coordination and decision execution, specifically as follows: According to the interference early warning message, combined with the preset coordination strategy, automatically generate a coordination plan; After the coordination plan is reviewed or modified manually, send it for execution, and at the same time execute step 3 to update the emergency communication network; Step 6, status feedback and database update, specifically as follows: After updating the emergency communication network, record the latest status information and perform visual analysis.

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