A multimedia communication system for intelligent dispatching emergency command vehicles

Abstract

The invention relates to the field of multimedia communication control, and specifically discloses an intelligent dispatching type multimedia communication system for an emergency command vehicle. The invention reduces the interference of the surrounding environment of the emergency command vehicle on the multimedia communication by surveying the communication environment at the accident site and analyzing the suitable parking position of the emergency command vehicle; performs network switching test and fault warning on the communication equipment of the emergency command vehicle to avoid affecting its normal network communication and service due to the failure of the communication equipment; detects the network load of the wireless communication of the emergency command vehicle in real time, and further dynamically adjusts and allocates the bandwidth according to the load of the network, thereby avoiding network congestion and ensuring the stability of the multimedia communication system of the emergency command vehicle when running under high load; monitors the communication quality of the wireless communication link of the emergency command vehicle in real time, and switches the satellite communication link in time when the communication quality is poor, thereby ensuring the uninterrupted communication and improving the communication reliability of the multimedia communication system in a complex environment.

Description

Technical Field

[0001] The invention relates to the field of multimedia communication control and regulation, and relates to a multimedia communication system for an intelligent dispatching emergency command vehicle. Background Art

[0002] With the continuous advancement of computer technology, communication technology and digital signal processing technology, multimedia communication has gradually developed from simple text and voice communication to complex communication systems that integrate multiple media forms such as audio, video, images, text, etc., and has been widely used in many fields.

[0003] Among them, the multimedia communication system on the emergency command vehicle is mainly used for rapid response and efficient command in emergencies. It can realize real-time transmission, interaction and processing of multimedia information such as voice, video, and data between the scene and the command center, provide strong support for emergency command decision-making, and ensure that command and dispatch work can be carried out quickly and efficiently at the scene of the emergency.

[0004] However, the existing multimedia communication system still has some limitations and deficiencies in practical applications, and such limitations and deficiencies are also reflected in the multimedia communication system of the emergency command vehicle.

[0005] For example, the existing Chinese patent with publication number CN101147364A discloses an integrated system and method for routing an optimized communication path of multimedia data according to the communication configuration of the user, a multimedia integrated communication system for analyzing appropriate communication routes and connecting calls based on various multimedia communication devices of the user, including a communication device for sending and receiving multimedia communication data of the user; a multimedia routing platform for sending and receiving the multimedia communication data to / from the communication device by combining / aggregating different types of communication devices, and controlling the communication device so that voice and image signals are communicated via an appropriate communication route; a network including a wired / wireless telephone network and a wired / wireless data communication network, for sending and receiving multimedia communication data; and a proxy server for obtaining communication environment information of the communication device through the platform, and determining an appropriate multimedia communication route before the call is connected, and then transmitting the multimedia communication data through the route. The system can perform multimedia communication with appropriate charges, quality and security.

[0006] For example, the existing Chinese patent with publication number CN1939032A discloses a multimedia communication and collaboration system and protocol, including a real-time routing server for transmitting and processing multimedia communication sessions through a network. The system also includes a group server for managing multimedia communication sessions through a network. The group server is connected to the routing server. The system also includes a plurality of endpoint processing devices for arranging and managing multimedia communication sessions through a network, and the plurality of endpoint processing devices are connected to the routing server and the group server. The protocol determines the topology of the network, reserves bandwidth, reserves media processing resources, and finds the optimal path and the optimal real-time routing server to transmit and process multimedia data.

[0007] Most of the above patents focus on analyzing the appropriate communication routes, optimal paths, optimal real-time routing servers, etc. of multimedia communications, so as to switch the communication links or communication methods in time when the communication quality is poor and ensure the stability of multimedia communications. However, the above patents do not involve the analysis of how to schedule and allocate resources such as dynamic bandwidth allocation when the multimedia communication network is overloaded, and thus cannot ensure the stability of the multimedia communication system when running under high load.

[0008] When emergency command vehicles face large-scale emergencies, many rescue forces are connected to the multimedia communication system at the same time, and a large amount of multimedia information such as high-definition audio and video, map data, and on-site inspection reports need to be transmitted. The communication bandwidth is easily insufficient, and there is an urgent need to schedule and allocate resources for the multimedia communication system to ensure that the commander can accurately judge the on-site situation and make timely scheduling decisions. Summary of the invention

[0009] In view of the above problems, the present invention proposes an intelligent dispatching type emergency command vehicle multimedia communication system to realize the function of multimedia communication regulation.

[0010] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides an intelligent dispatching emergency command vehicle multimedia communication system, including: an accident site communication environment survey module: used to obtain communication environment information of each sub-area of ​​the accident site, wherein the communication environment information includes topographic information, building information, vegetation coverage information, and electromagnetic interference equipment information, and analyzes the communication impact degree index of each sub-area of ​​the accident site.

[0011] Emergency command vehicle parking location selection module: used to screen the appropriate parking location for the emergency command vehicle based on the communication impact index of each sub-area at the accident site and provide feedback.

[0012] Communication equipment trial operation test module: used to test the communication equipment in the emergency command vehicle, perform network switching tests on the communication equipment in the emergency command vehicle, and evaluate the communication stability coefficient of the communication equipment in the emergency command vehicle.

[0013] Communication equipment fault warning feedback module: used to judge whether there is a fault in each communication device in the emergency command vehicle according to the communication stability coefficient of each communication device in the emergency command vehicle, and issue a warning.

[0014] Wireless communication transmission bandwidth adjustment and allocation module: used to detect the data flow information of each branch of the wireless communication link during the wireless communication of the emergency command vehicle in real time, analyze the network load overload coefficient of the wireless communication link, determine whether the transmission bandwidth of the wireless communication link needs to be adjusted, and further allocate the transmission bandwidth.

[0015] Wireless communication quality poor monitoring and processing module: used to monitor the communication quality information of the wireless communication link of the emergency command vehicle in real time, where the communication quality information includes signal strength, data transmission rate, jitter degree, and delay, to determine whether the communication quality of the wireless communication link is poor and switch the satellite communication link.

[0016] Database: used to store the set of electromagnetic interference devices, the maximum data transmission volume of wireless communication links, and the transmission bandwidth reduction ratio corresponding to each communication application type when the communication network is in a high-load state.

[0017] Compared with the prior art, the intelligent dispatching emergency command vehicle multimedia communication system described in the present invention has the following beneficial effects: 1. The present invention further analyzes the appropriate parking position of the emergency command vehicle by surveying the communication environment at the accident site, thereby reducing the impact and interference of the surrounding environment of the emergency command vehicle on multimedia communications.

[0018] 2. The present invention conducts network switching tests such as switching between wireless communication link branches, switching between satellite communication link branches, and switching between wireless communication links and satellite communication links on the communication equipment of the emergency command vehicle by trial running the communication equipment of the emergency command vehicle, so as to determine whether the communication equipment of the emergency command vehicle is faulty and issue an early warning to avoid affecting its normal network communication and services due to the failure of the communication equipment.

[0019] 3. The present invention detects the data flow information of the wireless communication link of the emergency command vehicle in real time, analyzes the network load overload coefficient of the wireless communication link, and determines whether it is necessary to adjust the transmission bandwidth of the wireless communication link and allocate the transmission bandwidth. It can dynamically adjust and allocate bandwidth according to the load conditions of the network, thereby avoiding network congestion and ensuring the stability of the multimedia communication system of the emergency command vehicle when running under high load.

[0020] 4. The present invention monitors the communication quality of the wireless communication link of the emergency command vehicle in real time, and promptly switches the satellite communication link when the communication quality is poor, thereby realizing the seamless integration of the satellite communication link and the wireless communication link. According to the real-time communication quality and data transmission requirements, the optimal communication link is automatically selected for data transmission, thereby ensuring the uninterrupted communication and improving the communication reliability of the multimedia communication system in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 This is a system module connection diagram of the present invention.

[0023] Figure 2 It is a flow chart of the wireless communication transmission bandwidth adjustment allocation module of the present invention.

[0024] Figure 3 It is a flow chart of the poor wireless communication quality monitoring and processing module of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 As shown, the present invention provides an intelligent dispatching type emergency command vehicle multimedia communication system, including an accident site communication environment survey module, an emergency command vehicle parking position selection module, a communication equipment trial operation test module, a communication equipment fault warning feedback module, a wireless communication transmission bandwidth adjustment and allocation module, a wireless communication poor quality monitoring and processing module, and a database.

[0027] The emergency command vehicle parking position selection module is respectively connected to the accident site communication environment survey module and the communication equipment trial operation test module; the communication equipment fault warning feedback module is respectively connected to the communication equipment trial operation test module and the wireless communication transmission bandwidth adjustment allocation module; the wireless communication poor quality monitoring and processing module is respectively connected to the wireless communication transmission bandwidth adjustment allocation module; and the database is respectively connected to the accident site communication environment survey module and the wireless communication transmission bandwidth adjustment allocation module.

[0028] The accident site communication environment survey module is used to obtain the communication environment information of each sub-area of ​​the accident site, wherein the communication environment information includes topographic information, building information, vegetation coverage information, and electromagnetic interference equipment information, and analyze the communication impact degree index of each sub-area of ​​the accident site.

[0029] Furthermore, the specific working process of the accident scene communication environment survey module includes: D1: After the emergency command vehicle arrives at the accident scene, it obtains the geographical location of the area where the accident scene is located, and further obtains an online map and satellite remote sensing image of the area where the accident scene is located.

[0030] As a preferred solution, the geographical location of the accident site can be obtained through a navigation system installed in the emergency command vehicle.

[0031] As a preferred option, the emergency command vehicle can update map data and satellite remote sensing data in real time by connecting to the Internet.

[0032] The area where the accident scene is located is divided according to the preset principles to obtain sub-areas of the accident scene.

[0033] Based on the online map and satellite remote sensing image of the area where the accident site is located, the online map and satellite remote sensing image of each sub-area of ​​the accident site are intercepted.

[0034] D2: According to the online map of each sub-area of ​​the accident site, obtain the topographic information of each sub-area of ​​the accident site, obtain the terrain type of each sub-area of ​​the accident site, set the communication impact factor corresponding to each terrain type, and filter out the communication impact factor corresponding to the terrain type of each sub-area of ​​the accident site, which is recorded as , The accident scene The number of the sub-regions, .

[0035] As a preferred solution, the terrain types include but are not limited to: plateau, plain, basin, hill, mountain and the like.

[0036] As a preferred solution, the communication impact factor corresponding to the terrain type of each sub-area of ​​the accident site refers to a value used to measure the degree of influence of different terrain types on the communication of each sub-area of ​​the accident site, and the acquisition method is as follows: 1. Determine the terrain type: According to the online map of each sub-area of ​​the accident site, obtain the terrain and geomorphic information of each sub-area, and determine its terrain type, such as plateau, plain, basin, hill, mountain, etc.; 2. Set the communication impact factor: For different terrain types, set the corresponding communication impact factor according to the law of its influence on the propagation of wireless signals. For example, terrains such as plateaus and hills will block the propagation of wireless signals, causing signal shadow areas, weakening the strength of received signals or even making them unreceivable. A relatively large communication impact factor can be set, such as 0.6; while in plains, signal propagation is relatively smooth, and a relatively small communication impact factor can be set, such as 0.2; 3. Filter the corresponding factor: According to the terrain type of each sub-area, filter out the corresponding factor from the set communication impact factor.

[0037] D3: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the building information of each sub-area of ​​the accident site, obtain the cumulative area, average height and density of the buildings in each sub-area of ​​the accident site, analyze the impact factor of the building obstruction in each sub-area of ​​the accident site on communication, and record it as .

[0038] As a preferred solution, the influence factors of the building obstruction on communication in each sub-area of ​​the accident site are analyzed. The specific method is as follows: the cumulative area, average height and density of the buildings in each sub-area of ​​the accident site are recorded as , , , by analyzing the formula Obtain the impact factor of building obstruction on communication in each sub-area of ​​the accident scene ,in They respectively represent the preset thresholds for the cumulative area, average height and density of buildings.

[0039] As a preferred solution, the building information of each sub-area of ​​the accident site can also be obtained through online maps, aerial remote sensing images, etc.

[0040] As a preferred solution, the density of buildings may represent the number of buildings per unit area or the building area per unit area.

[0041] As a preferred solution, buildings such as high-rise buildings will block and reflect wireless signals, change the signal propagation path, produce multipath effects and shadow effects, and thus affect the signal strength and quality.

[0042] D4: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the vegetation coverage information of each sub-area of ​​the accident site, obtain the coverage area, density and height of the vegetation in each sub-area of ​​the accident site, analyze the impact factor of the vegetation coverage of each sub-area of ​​the accident site on communication, and record it as .

[0043] As a preferred solution, the influence factors of vegetation coverage in each sub-area of ​​the accident site on communication are analyzed. The specific method is as follows: the coverage area, density and height of vegetation in each sub-area of ​​the accident site are recorded as , by analyzing the formula Obtain the impact factor of vegetation coverage in each sub-area of ​​the accident site on communication ,in They respectively represent the preset thresholds of vegetation coverage area, density and height.

[0044] As a preferred solution, the vegetation coverage information of each sub-area of ​​the accident site can also be obtained through online maps, aerial remote sensing images, etc.

[0045] As a preferred solution, vegetation such as trees and forests absorb and scatter wireless signals, which will weaken the signal strength. In addition, factors such as the density and height of vegetation will also affect the degree of signal attenuation. In areas with dense vegetation, the coverage range and signal quality of wireless communication will be greatly affected.

[0046] D5: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the information of electromagnetic interference equipment in each sub-area of ​​the accident site, obtain each electromagnetic interference equipment in each sub-area of ​​the accident site, set the interference signal level corresponding to each electromagnetic interference equipment, count the number of electromagnetic interference equipment of each interference signal level in each sub-area of ​​the accident site, analyze the impact factor of electromagnetic interference in each sub-area of ​​the accident site on communication, and record it as .

[0047] As a preferred solution, the influence factors of electromagnetic interference on communication in each sub-area of ​​the accident site are analyzed. The specific method is as follows: the number of electromagnetic interference devices with each interference signal level in each sub-area of ​​the accident site is recorded as , Indicates The number of the interference signal level, , by analyzing the formula Obtain the impact factor of electromagnetic interference on communication in each sub-area of ​​the accident site ,in represents a natural constant, Indicates the preset The weight of the interference signal level, , Indicates the impact factor corresponding to the preset number of unit electromagnetic interference devices.

[0048] As a preferred solution, each electromagnetic interference device in each sub-area of ​​the accident site is obtained. The specific method is: through the satellite remote sensing images of each sub-area of ​​the accident site, the real-life images of each sub-area of ​​the accident site are obtained, and the power equipment in each sub-area of ​​the accident site is further identified through image recognition technology. The power equipment in each sub-area of ​​the accident site is compared with the set of electromagnetic interference devices stored in the database, and the electromagnetic interference devices in each sub-area of ​​the accident site are screened.

[0049] As a preferred solution, the electromagnetic interference equipment includes but is not limited to: radio transmission equipment such as radio stations, television stations, wireless communication base stations, and power system equipment such as high-voltage transmission lines and substations.

[0050] As a preferred solution, electromagnetic interference may be generated near radio transmission sources and strong electromagnetic radiation sources, affecting the reception and transmission of satellite communication and wireless communication signals.

[0051] As a preferred solution, the higher the interference signal level is, the greater the weight of the interference signal level is.

[0052] Furthermore, the specific working process of the accident scene communication environment survey module also includes: by analyzing the formula Get the communication impact index of each sub-area at the accident site ,in They represent the communication impact factors corresponding to the preset terrain types and the weights of the impact factors of building blocking, vegetation coverage, and electromagnetic interference on communication. .

[0053] As a preferred solution, the weights of the communication impact factor corresponding to the terrain type and the impact factors of building obstruction, vegetation coverage, and electromagnetic interference on communication are set according to the importance of the impact of terrain, building obstruction, vegetation coverage, and electromagnetic interference on communication when evaluating the appropriate parking location of the emergency command vehicle. In a specific embodiment, the weights of the communication impact factor corresponding to the terrain type and the impact factors of building obstruction, vegetation coverage, and electromagnetic interference on communication are 0.1, 0.3, 0.3, and 0.3, respectively.

[0054] The emergency command vehicle parking position selection module is used to select a suitable parking position for the emergency command vehicle according to the communication impact index of each sub-area at the accident site and provide feedback.

[0055] Furthermore, the specific working process of the emergency command vehicle parking position selection module is: comparing the communication impact degree indexes of various sub-areas of the accident scene, obtaining the sub-area corresponding to the minimum communication impact degree index, and using it as a suitable parking position for the emergency command vehicle for feedback.

[0056] It should be noted that the present invention further analyzes the appropriate parking position of the emergency command vehicle by surveying the communication environment at the accident site, thereby reducing the impact and interference of the environment surrounding the emergency command vehicle on multimedia communications.

[0057] The communication equipment trial operation test module is used to trial operate each communication equipment in the emergency command vehicle, perform a network switching test on each communication equipment in the emergency command vehicle, and evaluate the communication stability coefficient of each communication equipment in the emergency command vehicle.

[0058] Furthermore, the specific working process of the communication equipment trial operation test module includes: F1: trial operation of each communication device in the emergency command vehicle, performing a network switching test on each communication device in the emergency command vehicle, obtaining the communication status information of each communication device in the emergency command vehicle switching between wireless communication link branches, and obtaining the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle switching between each branch of the wireless communication link, and recording them as , Indicates The number of the communication device, , Indicates The number of the secondary branch switch, .

[0059] As a preferred solution, a branch represents a branch part in a communication link. For example, in a multiple-input multiple-output wireless communication system, there are multiple communication branches from multiple antennas at the transmitting end to multiple antennas at the receiving end, and each communication branch carries a part of the information transmission task.

[0060] By analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication branches ,in Indicates the number of branch switching. represents a natural constant, They respectively represent the thresholds of preset communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation.

[0061] F2: Obtain the communication status information of each communication device in the emergency command vehicle when switching between satellite communication link branches, analyze the communication stability factor of each communication device in the emergency command vehicle based on switching between satellite communication branches, and record it as .

[0062] As a preferred solution, the communication stability factor of each communication device in the emergency command vehicle based on the switching between satellite communication branches is analyzed. The specific method is: obtain the communication status information of each communication device in the emergency command vehicle when switching between satellite communication link branches, and obtain the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle when switching between satellite communication link branches, and record them as , Satellite communication link The number of the secondary branch switch, .

[0063] By analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between satellite communication branches ,in Indicates the number of satellite communication link branch switching times.

[0064] F3: Obtain the communication status information of each communication device in the emergency command vehicle when switching between the wireless communication link and the satellite communication link, analyze the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication, and record it as .

[0065] As a preferred solution, the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication is analyzed. The specific method is: obtain the communication status information of each communication device in the emergency command vehicle when switching between wireless communication and satellite communication, and obtain the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle when switching between wireless communication and satellite communication, and record them as , by analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication .

[0066] Furthermore, the specific working process of the communication equipment trial operation test module also includes: calculating the weighted average of the communication stability factors of each communication equipment in the emergency command vehicle based on switching between wireless communication branches, switching between satellite communication branches, and switching between wireless communication and satellite communication, to obtain the communication stability coefficient of each communication equipment in the emergency command vehicle.

[0067] As a preferred solution, the weights of the communication stability factors based on switching between wireless communication branches, switching between satellite communication branches, and switching between wireless communication and satellite communication are set values ​​and the cumulative sum is 1. In a specific embodiment, the weights of the communication stability factors based on switching between wireless communication branches, switching between satellite communication branches, and switching between wireless communication and satellite communication are 0.3, 0.3, and 0.4, respectively.

[0068] As a preferred solution, the communication equipment should be able to complete network switching quickly and smoothly. The communication interruption time during the network switching process should be as short as possible. Normal communication can be restored quickly after switching, and the communication quality is not significantly affected.

[0069] The communication equipment failure early warning feedback module is used to determine whether each communication device in the emergency command vehicle has a failure according to the communication stability coefficient of each communication device in the emergency command vehicle, and to issue an early warning.

[0070] Furthermore, the specific working process of the communication equipment fault warning feedback module is: comparing the communication stability coefficient of each communication device in the emergency command vehicle with a preset communication stability coefficient threshold; if the communication stability coefficient of a communication device in the emergency command vehicle is less than the preset communication stability coefficient threshold, then the communication device has a fault; statistics are collected on each communication device with a fault in the emergency command vehicle, and a warning is issued.

[0071] It should be noted that the present invention conducts network switching tests such as switching between wireless communication link branches, switching between satellite communication link branches, and switching between wireless communication links and satellite communication links on the communication equipment of the emergency command vehicle by trial running the communication equipment of the emergency command vehicle, so as to determine whether the communication equipment of the emergency command vehicle is faulty and issue an early warning to avoid affecting its normal network communication and services due to the failure of the communication equipment.

[0072] The wireless communication transmission bandwidth adjustment and allocation module is used to detect in real time the data flow information of each branch of the wireless communication link during the wireless communication process of the emergency command vehicle, analyze the network load overload coefficient of the wireless communication link, determine whether the transmission bandwidth of the wireless communication link needs to be adjusted, and further allocate the transmission bandwidth.

[0073] Further, see Figure 2 As shown, the specific working process of the wireless communication transmission bandwidth adjustment and allocation module includes: using the built-in flow monitoring tool of the network equipment in the emergency rescue vehicle, real-time detection of the data flow information of each branch of the wireless communication link during the wireless communication of the emergency command vehicle is performed, and the data volume and flow of each branch of the wireless communication link are obtained, and the link utilization rate, average flow rate and peak flow rate of the wireless communication link are further obtained, which are recorded as , by analyzing the formula Get the network load overload factor of the wireless communication link ,in They respectively represent the link utilization, average flow, and peak flow thresholds of the preset wireless communication link.

[0074] As a preferred solution, the network equipment includes but is not limited to: routers, switches, etc.

[0075] As a preferred solution, the link utilization of the wireless communication link is obtained. The specific method is: obtain the ratio between the cumulative data volume of the wireless communication link branch and the maximum transmission data volume of the wireless communication link stored in the database, and record it as the link utilization of the wireless communication link.

[0076] As a preferred solution, the average flow of the wireless communication link is obtained. The specific method is: average the flow of each branch of the wireless communication link is calculated to obtain the average flow of the wireless communication link.

[0077] As a preferred solution, the peak flow of the wireless communication link is obtained. The specific method is: compare the flow of each branch of the wireless communication link with each other, obtain the maximum flow of the wireless communication link branch, and record it as the peak flow of the wireless communication link.

[0078] As a preferred solution, the link utilization, average flow, and peak flow thresholds of the wireless communication link can be set and adjusted according to the specific requirements and performance objectives of the emergency command vehicle network.

[0079] Furthermore, the specific working process of the wireless communication transmission bandwidth adjustment and allocation module also includes: W1: comparing the network load overload coefficient of the wireless communication link with a preset network load overload coefficient threshold. If the network load overload coefficient of the wireless communication link is greater than or equal to the preset network load overload coefficient threshold, it is necessary to adjust the transmission bandwidth of the wireless communication link and execute W2. Otherwise, it is not necessary to adjust the transmission bandwidth of the wireless communication link.

[0080] W2: Obtain the communication application type of each branch of the wireless communication link, extract the transmission bandwidth reduction ratio corresponding to each communication application type when the communication network is in a high-load state stored in the database, filter out the transmission bandwidth reduction ratio of each branch of the wireless communication link, and further adjust and allocate the transmission bandwidth of each branch of the wireless communication link.

[0081] As a preferred solution, the communication application types include but are not limited to: voice calls, video conferences, image sending, text transmission, etc.

[0082] As a preferred solution, the transmission bandwidth reduction ratio refers to the ratio between the transmission bandwidth reduction amount and the transmission bandwidth before the reduction, and the transmission bandwidth reduction ratio can be a positive number, a negative number or zero.

[0083] As a preferred solution, different communication application types have different requirements and sensitivities to bandwidth. In a specific embodiment, video conferencing requires a larger bandwidth to ensure the smoothness of the picture, while text transmission has a relatively lower bandwidth requirement.

[0084] As a preferred solution, when the communication network is in a high-load state, the transmission bandwidth of communication application types with higher bandwidth demand and sensitivity can be increased slightly, remain unchanged, or slightly reduced. At this time, the corresponding transmission bandwidth reduction ratios are negative, zero, and positive, respectively.

[0085] In another specific embodiment, the bandwidth adjustment strategy when the communication network is in a high-load state may be an adjustment strategy based on user priority, a fairness adjustment strategy, and the like.

[0086] It should be noted that the present invention detects the data flow information of the wireless communication link of the emergency command vehicle in real time, analyzes the network load overload coefficient of the wireless communication link, and determines whether it is necessary to adjust the transmission bandwidth of the wireless communication link and allocate the transmission bandwidth. It can dynamically adjust and allocate bandwidth according to the load conditions of the network, thereby avoiding network congestion and ensuring the stability of the multimedia communication system of the emergency command vehicle when running under high load.

[0087] The poor wireless communication quality monitoring and processing module is used to monitor the communication quality information of the wireless communication link of the emergency command vehicle in real time, where the communication quality information includes signal strength, data transmission rate, jitter degree, and delay, to determine whether the communication quality of the wireless communication link is poor, and to switch the satellite communication link.

[0088] Further, see Figure 3 As shown, the specific working process of the poor wireless communication quality monitoring and processing module is: real-time monitoring of the signal strength, data transmission rate, and delay of the wireless communication link of the emergency command vehicle, which are respectively recorded as .

[0089] As a preferred solution, delay refers to the time delay experienced by a communication signal from a sending end to a receiving end, including transmission delay, processing delay, queuing delay, etc.

[0090] Monitor the maximum jitter amplitude and maximum jitter frequency of the wireless communication link signal, substitute them into the relationship function between the preset jitter amplitude and jitter frequency and the jitter degree, and obtain the jitter degree of the wireless communication link, which is recorded as .

[0091] As a preferred solution, the relationship function between the jitter amplitude, jitter frequency and jitter degree is a positive growth trend function, that is, the greater the jitter amplitude and the greater the jitter frequency, the greater the jitter degree.

[0092] By analyzing the formula Get the communication quality evaluation coefficient of the wireless communication link ,in They respectively represent the preset thresholds of signal strength, data transmission rate, delay, and jitter level.

[0093] As a preferred solution, the thresholds of signal strength, data transmission rate, delay, and jitter level can be set and adjusted according to the specific requirements and performance goals of the emergency command vehicle network.

[0094] The communication quality evaluation coefficient of the wireless communication link is compared with a preset communication quality evaluation coefficient threshold. If the communication quality evaluation coefficient of the wireless communication link is less than the preset communication quality evaluation coefficient threshold, the communication quality of the wireless communication link is poor, and the satellite communication link is switched.

[0095] It should be noted that the present invention realizes seamless integration of satellite communication links and wireless communication links by monitoring the communication quality of the wireless communication link of the emergency command vehicle in real time, and promptly switches to the satellite communication link when the communication quality is poor. According to the real-time communication quality and data transmission requirements, the optimal communication link is automatically selected for data transmission, thereby ensuring the uninterrupted communication and improving the communication reliability of the multimedia communication system in complex environments.

[0096] The database is used to store a set of electromagnetic interference devices, a maximum transmission data volume of a wireless communication link, and a transmission bandwidth reduction ratio corresponding to each communication application type when the communication network is in a high-load state.

[0097] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. An intelligent dispatching emergency command vehicle multimedia communication system, characterized in that: include: The accident site communication environment survey module is used to obtain the communication environment information of each sub-area of ​​the accident site, where the communication environment information includes topographic information, building information, vegetation coverage information, and electromagnetic interference equipment information, and analyze the communication impact index of each sub-area of ​​the accident site; Emergency command vehicle parking position selection module: used to select the appropriate parking position of the emergency command vehicle according to the communication impact index of each sub-area of ​​the accident site and provide feedback; Communication equipment trial operation test module: used to test the communication equipment in the emergency command vehicle, conduct network switching tests on the communication equipment in the emergency command vehicle, and evaluate the communication stability coefficient of the communication equipment in the emergency command vehicle; Communication equipment failure warning feedback module: used to determine whether there is a failure in each communication device in the emergency command vehicle according to the communication stability coefficient of each communication device in the emergency command vehicle, and issue a warning; Wireless communication transmission bandwidth adjustment and allocation module: used to detect the data flow information of each branch of the wireless communication link during the wireless communication of the emergency command vehicle in real time, analyze the network load overload coefficient of the wireless communication link, determine whether the transmission bandwidth of the wireless communication link needs to be adjusted, and further allocate the transmission bandwidth; Poor wireless communication quality monitoring and processing module: used to monitor the communication quality information of the wireless communication link of the emergency command vehicle in real time, where the communication quality information includes signal strength, data transmission rate, jitter degree and delay, determine whether the communication quality of the wireless communication link is poor, and switch the satellite communication link; Database: used to store the electromagnetic interference equipment set, the maximum transmission data volume of the wireless communication link, and the transmission bandwidth reduction ratio corresponding to each communication application type when the communication network is in a high-load state.

2. According to claim 1, a multimedia communication system for an intelligent dispatching emergency command vehicle is characterized in that: The specific working process of the accident scene communication environment survey module includes: D1: After the emergency command vehicle arrives at the accident scene, it obtains the geographical location of the accident scene, and further obtains the online map and satellite remote sensing image of the accident scene; Divide the area where the accident scene is located according to the preset principles to obtain various sub-areas of the accident scene; Based on the online maps and satellite remote sensing images of the area where the accident site is located, intercept the online maps and satellite remote sensing images of each sub-area of ​​the accident site; D2: According to the online map of each sub-area of ​​the accident site, obtain the topographic information of each sub-area of ​​the accident site, obtain the terrain type of each sub-area of ​​the accident site, set the communication impact factor corresponding to each terrain type, and filter out the communication impact factor corresponding to the terrain type of each sub-area of ​​the accident site, which is recorded as , Indicates the accident scene The number of the sub-regions, ; The communication impact factor corresponding to the terrain type of each sub-area of ​​the accident site refers to a value used to measure the degree of influence of different terrain types on the communication of each sub-area of ​​the accident site, and the acquisition method is as follows: Determine the terrain type: According to the online map of each sub-area of ​​the accident site, obtain the terrain information of each sub-area and determine its terrain type; Set the communication impact factor: For different terrain types, set the corresponding communication impact factor according to the influence law of the terrain type on the wireless signal propagation; Filter the corresponding factor: According to the terrain type of each sub-area, filter the corresponding factor from the set communication impact factor; D3: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the building information of each sub-area of ​​the accident site, obtain the cumulative area, average height and density of the buildings in each sub-area of ​​the accident site, analyze the impact factor of the building obstruction in each sub-area of ​​the accident site on communication, and record it as ; The influence factors of the building obstruction in each sub-area of ​​the accident site on the communication are analyzed. The specific method is as follows: the cumulative area, average height and density of the buildings in each sub-area of ​​the accident site are recorded as , , , by analyzing the formula Obtain the impact factor of building obstruction on communication in each sub-area of ​​the accident scene ,in They represent the preset thresholds of cumulative area, average height and density of buildings respectively; D4: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the vegetation coverage information of each sub-area of ​​the accident site, obtain the coverage area, density and height of the vegetation in each sub-area of ​​the accident site, analyze the impact factor of the vegetation coverage of each sub-area of ​​the accident site on communication, and record it as ; The influence factors of vegetation coverage in each sub-area of ​​the accident site on communication are analyzed. The specific method is as follows: the coverage area, density and height of vegetation in each sub-area of ​​the accident site are recorded as , by analyzing the formula Obtain the impact factor of vegetation coverage in each sub-area of ​​the accident site on communication ,in Respectively represent the thresholds of the preset vegetation coverage area, density and height; D5: Based on the satellite remote sensing images of each sub-area of ​​the accident site, obtain the information of electromagnetic interference equipment in each sub-area of ​​the accident site, obtain each electromagnetic interference equipment in each sub-area of ​​the accident site, set the interference signal level corresponding to each electromagnetic interference equipment, count the number of electromagnetic interference equipment of each interference signal level in each sub-area of ​​the accident site, analyze the impact factor of electromagnetic interference in each sub-area of ​​the accident site on communication, and record it as ; Analyze the impact factors of electromagnetic interference on communication in each sub-area of ​​the accident site. The specific method is: record the number of electromagnetic interference devices with each interference signal level in each sub-area of ​​the accident site as , Indicates The number of the interference signal level, , by analyzing the formula Obtain the impact factor of electromagnetic interference on communication in each sub-area of ​​the accident site ,in represents a natural constant, Indicates the preset The weight of the interference signal level, , Indicates the impact factor corresponding to the preset number of unit electromagnetic interference devices.

3. According to claim 2, a multimedia communication system for an intelligent dispatching emergency command vehicle is characterized in that: The specific working process of the accident scene communication environment survey module also includes: By analyzing the formula Get the communication impact index of each sub-area at the accident site ,in They represent the communication impact factors corresponding to the preset terrain types and the weights of the impact factors of building blocking, vegetation coverage, and electromagnetic interference on communication. .

4. The multimedia communication system for an intelligent dispatching emergency command vehicle according to claim 1 is characterized in that: The specific working process of the emergency command vehicle parking position selection module is as follows: The communication impact indexes of various sub-areas at the accident site are compared with each other, and the sub-area corresponding to the minimum communication impact index is obtained, which is used as the appropriate parking position for the emergency command vehicle and feedback is given.

5. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 1 is characterized by: The specific working process of the communication equipment trial operation test module includes: F1: Test run each communication device in the emergency command vehicle, conduct network switching test on each communication device in the emergency command vehicle, obtain the communication status information of each communication device in the emergency command vehicle when switching between wireless communication link branches, obtain the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle when switching between each branch of the wireless communication link, and record them as , Indicates The number of the communication device, , Indicates The number of the secondary branch switch, ; By analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication branches ,in Indicates the number of wireless communication link branch switching times, represents a natural constant, Respectively represent the thresholds of preset communication interruption duration, communication interruption times, signal strength change, and bit error rate fluctuation; F2: Obtain the communication status information of each communication device in the emergency command vehicle when switching between satellite communication link branches, analyze the communication stability factor of each communication device in the emergency command vehicle based on switching between satellite communication branches, and record it as ; The communication stability factor of each communication device in the emergency command vehicle based on the switching between satellite communication branches is analyzed. The specific method is as follows: the communication status information of each communication device in the emergency command vehicle switching between satellite communication link branches is obtained, and the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle switching between satellite communication link branches are obtained, which are recorded as , Satellite communication link The number of the secondary branch switch, ; By analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between satellite communication branches ,in Indicates the number of satellite communication link branch switching; F3: Obtain the communication status information of each communication device in the emergency command vehicle when switching between the wireless communication link and the satellite communication link, analyze the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication, and record it as ; The communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication is analyzed. The specific method is as follows: the communication status information of each communication device in the emergency command vehicle when switching between wireless communication and satellite communication is obtained, and the communication interruption duration, number of communication interruptions, signal strength change, and bit error rate fluctuation of each communication device in the emergency command vehicle when switching between wireless communication and satellite communication are obtained, which are recorded as , by analyzing the formula Obtain the communication stability factor of each communication device in the emergency command vehicle based on the switching between wireless communication and satellite communication .

6. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 5 is characterized by: The specific working process of the communication equipment trial operation test module also includes: The weighted average value of the communication stability factors of each communication device in the emergency command vehicle based on switching between wireless communication branches, switching between satellite communication branches, and switching between wireless communication and satellite communication is calculated to obtain the communication stability coefficient of each communication device in the emergency command vehicle.

7. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 1 is characterized by: The specific working process of the communication equipment fault early warning feedback module is as follows: The communication stability coefficient of each communication device in the emergency command vehicle is compared with the preset communication stability coefficient threshold. If the communication stability coefficient of a communication device in the emergency command vehicle is less than the preset communication stability coefficient threshold, the communication device has a fault. Statistics are collected on the communication devices with faults in the emergency command vehicle and early warning is issued.

8. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 1 is characterized by: The specific working process of the wireless communication transmission bandwidth adjustment and allocation module includes: Through the built-in traffic monitoring tool in the network equipment of the emergency rescue vehicle, the data traffic information of each branch of the wireless communication link during the wireless communication of the emergency command vehicle is detected in real time, and the data volume and traffic of each branch of the wireless communication link are obtained. The link utilization rate, average traffic and peak traffic of the wireless communication link are further obtained, which are recorded as , by analyzing the formula , represents the natural constant, and obtains the network load overload coefficient of the wireless communication link ,in They respectively represent the link utilization, average flow, and peak flow thresholds of the preset wireless communication link.

9. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 8 is characterized by: The specific working process of the wireless communication transmission bandwidth adjustment and allocation module also includes: W1: Compare the network load overload coefficient of the wireless communication link with the preset network load overload coefficient threshold. If the network load overload coefficient of the wireless communication link is greater than or equal to the preset network load overload coefficient threshold, it is necessary to adjust the transmission bandwidth of the wireless communication link and execute W2. Otherwise, it is not necessary to adjust the transmission bandwidth of the wireless communication link. W2: Obtain the communication application type of each branch of the wireless communication link, extract the transmission bandwidth reduction ratio corresponding to each communication application type when the communication network is in a high-load state stored in the database, filter out the transmission bandwidth reduction ratio of each branch of the wireless communication link, and further adjust and allocate the transmission bandwidth of each branch of the wireless communication link.

10. The intelligent dispatching emergency command vehicle multimedia communication system according to claim 1 is characterized by: The specific working process of the poor wireless communication quality monitoring and processing module is as follows: Real-time monitoring of the signal strength, data transmission rate, and delay of the wireless communication link of the emergency command vehicle are recorded as ; Monitor the maximum jitter amplitude and maximum jitter frequency of the wireless communication link signal, substitute them into the relationship function between the preset jitter amplitude and jitter frequency and the jitter degree, and obtain the jitter degree of the wireless communication link, which is recorded as ; By analyzing the formula Get the communication quality evaluation coefficient of the wireless communication link ,in Respectively represent the thresholds of preset signal strength, data transmission rate, delay, and jitter degree; The communication quality evaluation coefficient of the wireless communication link is compared with a preset communication quality evaluation coefficient threshold. If the communication quality evaluation coefficient of the wireless communication link is less than the preset communication quality evaluation coefficient threshold, the communication quality of the wireless communication link is poor, and the satellite communication link is switched.

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