Real-time data transmission method based on local area network

Abstract

The invention provides a real-time data transmission method based on a local area network, comprising a real-time data user terminal, a wireless accessing point, a local area network switchboard and a real-time data transmission managing center. The real-time data transmission method can provide real-time data transmission which has fast connection speed, strong instantaneity and priority grade and has absolute enforced preferential communication for a real-time data user terminal on the basis of a network system of the existing local area network and under the condition of keeping the existing data accessing and transmission functions of the local area network; and the real-time data transmission method has general calling, group calling, announcing and urgent inserting functions and can meet the requirements of the real-time data user terminal on the transmission of voice data, video data and real-time control data.

Description

technical field [0001] The present invention is a real-time data transmission method based on a local area network. The local area network includes a wireless local area network and a wired local area network. The real-time data includes voice data, video data and real-time control data, and belongs to the technical field of local area networks. Background technique [0002] The existing local area network technology has strong and flexible data access service functions, so the local area network is widely used. Among the transmission protocols adopted in the existing local area network technology, the more common one is the WIFI authentication protocol. WIFI technology is used in wireless The transmission protocol used in transmission and access is IEEE 802.11, and the common transmission protocol in wired LAN transmission is IEEE 802.3, whose common feature is to use carrier sense and conflict detection to control the transmission of information in the network. In some LAN...

AI Technical Summary

Problems solved by technology

[0003] 1. The authentication process for LAN user terminals to access the LAN is long, which is not conducive to the rapid access of LAN user terminals and fast switching when moving, resulting in a long connection interruption time;

[0004] 2. The wireless data access transmission of the LAN user terminal adopts the user competition mode, which causes the wireless data access delay to be too large. Compared with the access of the LAN user terminal, there is no absolute priority and better reliability guarantee; Competitive working mode, due to the polling method, when there are many LAN user terminals at the same access point, the polling time will be longer, and the data transmission efficiency of the LAN user terminals will decrease; although different Different frame intervals are used to set different priorities, but this is only a way to reduce collisions and increase the transmission probability of some frames, and does not have absolute priority functions and fixed transmission rate guarantees;

[0005] 3. The wired transmission part of the LAN adopts the Ethernet transmission protocol, and its user data transmission also adopts the competition mode. In network equipment, such as LAN switches, routers, and gateways, most of them adopt the store-and-forward working mode, resulting in excessive data transmission delay. And there is no absolute priority and better reliability guarantee;

[0006] 4. Due to the large number of data terminals for monitoring and monitoring in the enterprise LAN, and the access competition of multiple users, the real-time data transmission capability of the access users is low;

[0007] The above four points lead to poor real-time performance of LAN transmission, which affects the use effect of real-time data transmission of LAN user terminals; in actual production scheduling communication work, it is necessary to have fast communication connection speed, strong real-time performance, and absolute priority level. Mandatory priority communication, and real-time data transmission technology with general call, group call, announcement and emergency insertion requirements to meet the needs of real-time data user terminals for voice data, video data and real-time control data transmission, while the existing conventional LAN data transfer protocols cannot meet these requirements

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