集装箱码头中TETRA网的流量分析

Data transmission flow analysis on TETRA network applied in container terminal

为分析TETRA(TErrestrialTrunked RAd io)网在集装箱码头中应用的可行性,通过对信号覆盖和数据传输的理论分析与现场测试,发现TETRA网能够满足集装箱码头复杂环境的数据传输要求.根据理论分析和测试结果,研制基于时间窗技术的应用层数据传输协议.该协议采用半双工通信模式,应用非独立冗余发送数据再传技术,使得其传输数据速率高、丢包率低且系统开销小.该研究表明TETRA技术可以有效地应用于集装箱码头.

To analyze the application feasibility of TErrestrial Trunked RAdio （TETRA） network in container terminal, signal coverage and data transmission are theoretically analyzed and tested on site. It is found that TETRA network can meet the requirements of container terminal under complex environment. According to the theoretical analysis and test results, data transmission protocol for application layer is developed based on time-window strategy. The protocol uses half-duplex communication mode, combined with re-transmitting lost data packages technology with redundant transmission. In the TETRA network, data transmission rate is high whereas packet loss rate and system spending is low. The study indicates that the TETRA network can be effectively applied in container terminal.