One: What is wireless roaming
In actual life, the development of the network has made more and more wireless application scenarios, especially data transmission when the terminal is in a mobile state, because the coverage area of a single base station is limited, the signal coverage area is not far, and the coverage strength is insufficient. Therefore, the effective coverage area can only be increased by increasing the coverage density. In this mode, the mobile terminal switches signals between multiple wireless base stations to communicate with the base stations. For traditional Internet access, the terminal switches signals between base stations, and the switching time is not high.
2: Security Roaming Requirements for Wireless Roaming
Wireless roaming is used in security systems, mainly for mobile video surveillance terminal heads to transmit data to a higher-level surveillance center through a certain wireless terminal. For the current HD surveillance system, the network HD camera video stream is large, especially in multi-channel video. In the case of transmission, the terminal returns a large amount of data, a large load, and a wide coverage area. At the same time, due to the particularity of wireless monitoring systems, video requirements are high. During the transmission of wireless video transmission signals, the communication link between the wireless mobile terminal and each base station should meet the requirements of low signal delay and continuous fluency. Ordinary wireless communication equipment is only aimed at some traditional Internet wireless coverage. Such systems have low data flow, a narrow area of Internet access, and a small amount of data carried by the terminal. None of these meet the requirements for distance and data transmission for wireless mobile monitoring. The traditional wireless overlay device firmware cannot achieve the true seamless roaming function because of different usage scenarios. The traditional wireless roaming function is only in terms of hardware. For example, after the communication link between the mobile terminal and the previous base station is disconnected, the terminal will scan faster. Instability and loss of signal. In addition, the traditional wireless coverage equipment has low power and low receiving sensitivity, which affects the effective coverage and communication effect of the signal as a whole, and cannot meet the data transmission requirements of high-definition video cameras.
Three: How to choose wireless roaming equipment for security system
Combined with wireless transmission applications, wireless communication signals require long transmission distances, high speeds, and continuous stability. It is especially critical for wireless video transmission selection that supports high-speed signal switching. Based on these requirements, our company's high-speed mobile wireless data switching equipment can meet such needs. It has the following characteristics:
1.High power and long coverage distance
The high-speed mobile wireless data transmission equipment has a radio frequency of up to 30dbm, which has a longer communication distance than traditional WiFi networks. With a professionally customized high-gain antenna, it can effectively cover a radius of more than 1 km in a barrier-free environment.
2.Fast switching speed
Our company re-customizes and optimizes the equipment software based on specific industry applications. For wireless coverage equipment in terminal mode, in order to achieve the purpose of fast switching communication between the base station and the base station. By embedding fast identification functions in the software, such as: presetting signal indicators such as communication bandwidth, signal switching, and signal floating in the wireless terminal device as required. When the wireless terminal and the base station A are in communication, follow the change of the communication signal during the movement. When the system judges that the signal reaches a preset threshold, the device in the terminal mode starts the pre-scanning signal mechanism. When the neighboring base station B is scanned, After the signal, the wireless terminal will automatically establish a communication link with the neighboring B base station. When the terminal continues to move, the terminal and the two base stations A and B automatically switch according to a preset signal threshold. Because the mobile terminal and the A / B base station are in a communication state, the data has been uploaded during the handover process, so it will not affect the wireless video signal transmission, ensuring video smoothness and continuity.
3.High transmission rate
For a high-speed mobile switching communication system, a high-bandwidth network that can support the transmission of high-definition video surveillance signals is required. Traditional network video surveillance signals have a single bitstream above 2Mbps. If a mobile terminal needs to transmit multiple HD video signals back at the same time, The video stream will reach 10Mbps or higher. Therefore, it is necessary to stably transmit such high and continuous data in a mobile state, which not only requires high data code streams, but also requires stable signal reception. By optimizing the software and hardware of the equipment, our high-speed wireless roaming transmission equipment has advantages such as transmission rate and high receiving sensitivity. Meet the requirements of HD wireless monitoring for data transmission.
Four: The main introduction and application of equipment
LA-MESH01 is a wireless base station product with MESH ad hoc networking features, with a Mini-PCI high-power wireless network card. Widely used in UAV image transmission, individual equipment, cruise ships, rail transportation, railway, emergency command, driving school subject two, subject three and other mobile network data transmission, it has online intelligent scanning, multi-path connection, intelligent path learning and other functions , Can provide high-bandwidth, low-latency data roaming services in high-speed mobile environments.