CAJ | 학술논문

针对以文字书写教学装置为终端的教室系统的数据传输要求和特性，分析已有协议处于该环境下所面临的局限性，提出一种适合该类教室系统的嵌入式局域网协议CSELP。在以太网帧的基础上扩展8个字节实现确认、超时重传、流量控制等功能，提供面向连接的可靠传输服务，简化数据处理和状态机制；采用改进的带宽预估算法估计可用带宽大小，在拥塞避免阶段根据预测的窗口大小变化调整拥塞窗口；设计重传队列实现面向组的确认机制，从而提高系统的实时性和传输效率。实验结果表明，该协议能满足文字书写教学教室系统的应用需求，并且可推广到非文字书写教学的教室系统。
침대이문자서사교학장치위종단적교실계통적수거전수요구화특성，분석이유협의처우해배경하소면림적국한성，제출일충괄합해류교실계통적감입식국역망협의CSELP。재이태망정적기출상확전8개자절실현학인、초시중전、류량공제등공능，제공면향련접적가고전수복무，간화수거처리화상태궤제；채용개진적대관예고산법고계가용대관대소，재옹새피면계단근거예측적창구대소변화조정옹새창구；설계중전대렬실현면향조적학인궤제，종이제고계통적실시성화전수효솔。실험결과표명，해협의능만족문자서사교학교실계통적응용수구，병차가추엄도비문자서사교학적교실계통。
According to the requirements and features of data transmission in a classroom system with writing teaching equipment for terminal,across analyzing the limitations of other protocols under this situation,an embedded LAN protocol is proposed based on Ethernet,which is suitable for the classroom system CSELP. Both the real-time performance and transmission efficiency are improved. Data frame expansion of 8 Byte achieves recognition,retransmission,flow control and other functions to provide connection-oriented reliable transmission service,and the data processing and sates method are simplified. The size of available bandwidth with improved bandwidth estimate algorithm is estimated and the congestion window by the prediction window size change in congestion avoidance is adjusted. The new design retransmission queue is used to implement the package-based ACK mechanism. Example application result shows that the protocol can satisfy the application requirements of the writing teaching classroom system,and can spread to other non-writing teaching classroom system.