CN108566626A - A kind of Wireless Mesh emergency communication system and method based on intelligent terminal - Google Patents

Abstract

The present invention proposes a wireless Mesh emergency communication system and method based on an intelligent terminal. The intelligent terminal of the current mainstream operating system is combined with the wireless Mesh communication module to form a portable communication terminal, and the communication between users is realized through the application program integrated and developed on the intelligent terminal. , which solves the communication network congestion and interruption in emergency scenarios, and ensures the information exchange in various emergency communication scenarios. The system consists of two or more portable communication terminals. By integrating PTT voice dispatch communication and multimedia data communication, the system can not only guarantee fast, smooth and real-time PTT voice dispatch communication in emergencies, But also provides a variety of high-speed, reliable data transmission services.

Description

A wireless Mesh emergency communication system and method based on an intelligent terminal

technical field

The invention relates to a wireless Mesh network technology and an emergency communication system, and belongs to the technical field of wireless communication, in particular to a wireless Mesh emergency communication system and method based on an intelligent terminal.

Background technique

At present, only within the coverage of mobile communication base stations in the existing cellular mobile communication, people can communicate flexibly and conveniently. Once major emergencies such as earthquakes, tsunamis, and fires occur, there will be serious damage to the infrastructure of communication, broadcasting, and electricity. The facility caused great damage, paralyzing communications throughout the coverage area, turning the disaster area into an information island. At present, the existing emergency communication systems for emergencies are mostly composed of mobile emergency command vehicles, individual equipment carried by rescuers, and remote command centers. However, in some specific scenarios, due to the limitation of the geographical environment, the mobile emergency command vehicle cannot reach the disaster site in time and quickly deploy and build a network, and the individual equipment carried by the rescuers is large in size, expensive, and has a single communication service function. Meet the needs of various emergency communication scenarios. Therefore, how to quickly build an emergency communication network at the scene of a major disaster and some special scenarios to ensure the smooth flow of information is a key issue that needs to be solved in the current wireless communication field.

With the rapid development of wireless communication and Internet technology, wireless Mesh network, as a new type of mobile wireless communication technology, is suitable for regional environmental coverage and broadband high-speed wireless access, and has outstanding features such as dynamic self-organization, self-configuration, and self-repair. , has become a hotspot in current wireless communication research. At the same time, once an emergency occurs, the general public has higher requirements for voice communication than other communication methods. How to ensure high-quality voice communication in emergencies, realize on-site interconnection, and ensure the rapid development and implementation of rescue work. At present, the traditional ways of data interaction between smart terminal devices and the outside world are mostly based on Bluetooth, WIFI and Micro USB serial ports. Among them, Bluetooth and WIFI both work in the 2.4GHz frequency band. During the transmission of voice data, due to emergency communication Due to the particularity of the system, the transmission performance is unstable, and it is easy to be interfered by the external environment, causing voice packet loss, delay, etc., and this situation is often unacceptable to people. However, Micro USB is not subject to external environment interference, can achieve high-speed or higher-speed data transmission, and the quality of voice calls is better than Bluetooth and WIFI. Therefore, there is a need for an emergency communication system and communication method based on a wireless Mesh network to ensure that the network is unblocked in any emergency or in a special scenario, and to ensure rapid networking and high-quality non-delay voice communication of users in a mobile working state. It communicates with other multimedia services, and is a portable terminal with base station and relay functions to further meet the needs of users.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems such as insufficiency in the existing emergency communication system and single emergency communication service in emergencies and special scenarios. The present invention provides a wireless Mesh emergency communication system and method based on an intelligent terminal, which solves communication obstacles such as no signal, blind spot coverage, and communication distance, realizes rapid construction of an emergency communication network without relying on additional infrastructure, and integrates PTT voice dispatch communication and The data and multimedia business communication are integrated to ensure the portability and timeliness of the emergency communication system. The general public users and rescuers can choose the appropriate business communication method according to actual needs, and ensure the information exchange and communication quality in special situations, which has a good application prospect.

In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

An intelligent terminal-based wireless Mesh emergency communication system includes two or more portable communication terminals. in,

The portable communication terminal is composed of a wireless Mesh communication module connected with an intelligent terminal through a Micro USB interface.

The smart terminal is installed with an application program for realizing the communication function of the user, and may be one of a computer, a tablet or a mobile phone.

The wireless Mesh communication module completes the initialization operation by loading the module driver through the application program.

Further, the wireless Mesh communication module is composed of a controller, a vocoder module, a GPS positioning module, a 2.4GHz radio frequency module, a virtual network card module, a serial communication module, and a power supply module. Among them, the smart terminal provides signal access for the 3.3V and 1.5V power supplies in the power module through the Micro USB interface.

Further, the controller uses FPGA chip technology to implement the Mesh routing algorithm and Mesh networking technology.

Further, the virtual network card module builds a virtual network environment by adding a virtual IP address to expand the communication services of the emergency communication system by loading the module driver.

Further, the vocoder adopts an innovative speech optimization path algorithm to realize high-quality speech communication with QOS guarantee.

Further, the application program installed on the intelligent terminal is responsible for completing the communication function between users in the Mesh network environment, specifically including PTT voice scheduling communication based on serial port communication and multimedia data communication based on IP network. Among them, PTT voice scheduling communication includes broadcasting, private conversations, group conversations and other cluster scheduling functions; multimedia data communication includes text messages, file transfers, voice and video calls between users and other functions.

Further, the PTT voice scheduling communication can manage PTT voice communication and enhance network bearing capacity by setting communication priority, adjusting network resources.

A kind of communication method of wireless Mesh emergency communication system based on intelligent terminal, its specific steps are as follows:

S10, the terminal user starts corresponding application software;

S20, the application software loads the driver program of the wireless Mesh communication module, and completes the corresponding initialization operation;

S30, judge according to the communication mode required by the user, if it is a PTT voice scheduling communication mode, then go to S40, otherwise it is a broadband data communication mode and go to S50;

S40. Select a PTT voice scheduling communication mode, and complete corresponding inter-user voice communication according to the corresponding communication mode. When communication between users is completed, transfer to S70;

S50, the application software sends a heartbeat packet every 5 seconds to detect online users, the terminal user selects corresponding online users to send different request instructions, the requested user parses the request instructions, and feeds back corresponding operations to the requesting user;

S60, requesting the user to analyze the feedback information, if accepted, establish a corresponding communication session with the requested user, and complete the session, otherwise go to S70;

S70, end;

Advantage of the present invention and effective effect are as follows:

The present invention proposes a wireless Mesh emergency communication system and method based on intelligent terminals through the research on the new wireless broadband access network technology and the current problems of the emergency communication system. The module constitutes a portable communication terminal, and the communication between users is realized through the application program integrated and developed on the smart terminal, which solves the communication network congestion and interruption in emergency scenarios, and ensures the information exchange in various emergency communication scenarios. This system has emergency characteristics such as fast and flexible network deployment and construction. The emergency communication terminal is portable, low power consumption, and low price. It can meet the communication needs of emergency command communication, emergency rescue, team field activities, and the Internet of Things.

This system integrates and develops application software based on wireless Mesh networks through intelligent terminals to realize user communication in emergency communication scenarios. Among them, the system adopts serial port communication to ensure the voice call quality and communication rate under the trunking dispatching communication mode. Through the management of network resources and communication priorities, the network carrying capacity and communication scheduling are enhanced; IP technology is used to expand text messages, file Transmission, two-way voice calls and video calls and other multimedia data communication services, the integration of multimedia data communication and trunking dispatch communication, so that the system can not only guarantee fast, smooth, real-time PTT voice dispatch communication in emergencies, but also It provides diversified, high-speed and reliable data transmission services.

Description of drawings

Fig. 1 is a structural diagram of a portable communication terminal;

Figure 2 is a network topology diagram of a wireless Mesh emergency communication system based on an intelligent terminal;

Fig. 3 is a flowchart of a communication method of a wireless Mesh emergency communication system based on an intelligent terminal.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Figure 1, the portable communication terminal is composed of a smart terminal and a wireless Mesh communication module, wherein the wireless Mesh communication module uses a USB communication module inserted into the Mini PCIE interface and is physically connected to the Micro USB interface of the smart terminal through an OTG data cable; The smart terminal supplies power to each functional module in the wireless Mesh communication module, and the initialization operation is completed by installing the application loading module driver developed based on the smart terminal. As shown in Figure 2, two or more portable communication terminals can be quickly deployed without relying on additional communication infrastructure to build a stable and reliable wireless Mesh network. At the same time, other portable terminals can also automatically monitor the network without interfering with other terminal users , discover and join the wireless Mesh network. Each portable communication terminal under the constructed wireless Mesh network realizes non-line-of-sight network connection through multi-hop communication to expand network coverage. The relay jump capability supports a maximum of 8 hops, and the single-hop communication distance is about 500 meters to 1000 meters . At the same time, its operating frequency range is 2.4GHz to 2.485GHz, which can be divided into 40 operating frequency bands, and 64 users can be accommodated in the same frequency band for communication.

Different users in different scenarios can choose different communication methods according to actual needs. In order to meet the user's requirements for voice communication quality and communication speed in the emergency communication scenario, the PTT voice scheduling communication under broadcast, private session and group session is completed by designing the serial port application layer communication protocol and related API functions. At the same time, in order to meet the diversified needs of users for emergency communication system services, an IP network platform is built through the virtual network card device provided by the wireless Mesh communication module, and IP technology is used to expand communication service types (such as text messages, file transfers, voice calls, video calls, etc.) Wait). By integrating trunking dispatch communication and multimedia data communication, high-quality voice and high-speed data communication between multiple users can be realized anytime and anywhere, meeting the communication needs of various emergency communication scenarios.

The communication method of the emergency communication system based on wireless Mesh is shown in Figure 3.

S10, the terminal user starts corresponding application software;

S20, the application software loads the driver program of the wireless Mesh communication module, and completes the corresponding initialization operation;

S30, judge according to the communication mode required by the user, if it is a PTT voice scheduling communication mode, then go to S40, otherwise it is a broadband data communication mode and go to S50;

S40. Select a PTT voice scheduling communication mode, and complete corresponding inter-user voice communication according to the corresponding communication mode. When communication between users is completed, transfer to S70;

S50, the application software sends a heartbeat packet every 5 seconds to detect online users, the terminal user selects corresponding online users to send different request instructions, the requested user parses the request instructions, and feeds back corresponding operations to the requesting user;

S60, requesting the user to analyze the feedback information, if accepted, establish a corresponding communication session with the requested user, and complete the session, otherwise go to S70;

S70, end.

Claims (9)

1. A wireless Mesh emergency communication system based on an intelligent terminal comprises: two or more portable communication terminals, characterized by:

the portable communication terminal is formed by connecting a wireless Mesh communication module with an intelligent terminal through a Micro USB interface.

The intelligent terminal is provided with an application program for realizing a user communication function, and the application program can be one of a computer, a tablet or a mobile phone.

The wireless Mesh communication module completes initialization operation through the driving of the application program loading module.

2. The emergency communication system of claim 1, wherein the wireless Mesh communication module comprises a controller, a vocoder module, a GPS positioning module, a 2.4GHz rf module, a virtual network card module, a serial communication module, and a power module.

3. The emergency communication system according to claim 2, wherein the controller module uses an alteracycle iii chip to implement an FPGA system to complete a Mesh routing algorithm and a Mesh networking technology, and implements broadband data transmission during high-speed movement.

4. The emergency communication system of claim 2, wherein the vocoder module enables QOS-guaranteed high quality voice communication by employing a novel voice-optimized path algorithm.

5. The emergency communication system of claim 2, wherein the GPS location module provides location information of the user.

6. The emergency communication system according to claim 2, wherein the emergency communication system adds a virtual IP address to build a local area network environment through a virtual network card module.

7. The emergency communication system of claim 1, wherein the intelligent terminal integrates PTT voice dispatch communication and multimedia data communication services through the wireless Mesh communication module, thereby expanding the service types of the conventional emergency communication system.

8. The emergency communication system of claim 7, wherein the PTT voice dispatch communication implements cluster dispatch functions of broadcasting, private conversation, group conversation, etc. in a cluster communication system based on a serial communication manner; the multimedia data communication realizes the functions of text message, file transmission, two-way voice call, video call and the like among intelligent terminal users based on the local area network built by the virtual network card.

9. A communication method of a wireless Mesh emergency communication system based on an intelligent terminal comprises the following steps:

s10, starting corresponding application software by the terminal user;

s20, loading a wireless Mesh communication module driver by the application software, and completing corresponding initialization operation;

s30, judging according to the communication mode needed by the user, if the communication mode is PTT voice scheduling communication mode, switching to S40, otherwise, switching to S50 for broadband data communication mode;

s40, selecting the PTT voice dispatching communication mode, and completing the corresponding voice communication between users according to the corresponding communication mode. If the communication between the users is completed, the step goes to S70;

s50, the application software sends heartbeat packets every 5 seconds to detect the online users, the terminal user selects the corresponding online user to send different request instructions, the requested user analyzes the request instructions, and corresponding operations are fed back to the requesting user;

s60, requesting the user to analyze the feedback information, if the feedback information is accepted, establishing a corresponding communication session with the requested user, and completing the session, otherwise, turning to S70;

and S70, ending.