A bus-type network load adaptive communication method

Abstract

The invention provides a bus type network load self-adaptive communication method for realizing load self-adaptive scheduling. The mode switching and the bus polling are realized through a mode flag bit A and a token flag bit B in a MAC frame produced through a network node, a corresponding counter and a related register. By use of the method, a network terminal can be located in a CSMA / CD mode under the high network load, and is located in a virtual token mode under the low network load, so that the network can maintain high throughput under the high network load and maintain the high use rate under the low network load. The mode information and the token information in the method are hidden in the flag bits, and a dedicated information frame is unnecessary to transmit in the bus. The system adopting the method provided by the invention is free from deadlock after the key MAC frame is lost, and problems of high conflict rate under the high load and the low use rate under the low load in the current single bus type scheduling algorithm are overcome at the same time; the data scheduling method under the virtual token model solves the network error problem that the token frame is lost in the existing token ring technology.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a bus type network load self-adaptive communication method. Background technique [0002] The bus is one of the earliest network topologies used in data communications. In the bus structure, multiple network nodes are connected to the same bus, and data transmission is performed in the form of time-division multiplexing. The data sent to the bus can be received by all network nodes on the bus. After receiving, the network nodes judge according to the destination address in the MAC frame. Whether to receive data. The bus structure is widely used in chip-level and printed circuit board-level system communications, and is also often used in industrial field bus and local area network structures. It has the characteristics of simple structure and good stability. [0003] The data scheduling of the bus structure often adopts methods such as CDMA / CD and token bus. The CSMA / CD metho...

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Problems solved by technology

[0004] The present invention aims at the disadvantages of the two commonly used bus data communication methods, combines the two commonly used bus data scheduling methods, and at the same time solves the problem of poor network performance of the CSMA / CD bus under high load and the network failure of the token bus under low load. The problem of low utilization

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