计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2015年
13期
77-80,117
,共5页
习字%嵌入式局域网协议%教室系统%学生端%教师端%作业交互
習字%嵌入式跼域網協議%教室繫統%學生耑%教師耑%作業交互
습자%감입식국역망협의%교실계통%학생단%교사단%작업교호
writing on learning%Embedded LAN Protocol(ELP)%classroom-system%students’terminal%teachers’terminal%writing exercises send to each other
针对嵌入式平台局域网协议、师生可叠写作业原图交互等问题，根据局域网内部嵌入式设备实时通信链路状态相对较好，硬件资源要求不高等特征，设计嵌入式习字教室系统。嵌入式局域网协议（ELP）在以太网帧上扩展8字节字段的包头；使用本地和远程的端口号和MAC地址来标识一个连接；使用窗口和速率相结合的流控机制，提供面向连接的可靠传输服务；参考uip优化状态机制、重传队列机制、确认机制和拥塞控制算法。实验结果表明，该教室系统内文件传输速度方面相比嵌入式TCP/IP有较大提高，有效实现了实时性原图作业交互。
針對嵌入式平檯跼域網協議、師生可疊寫作業原圖交互等問題，根據跼域網內部嵌入式設備實時通信鏈路狀態相對較好，硬件資源要求不高等特徵，設計嵌入式習字教室繫統。嵌入式跼域網協議（ELP）在以太網幀上擴展8字節字段的包頭；使用本地和遠程的耑口號和MAC地阯來標識一箇連接；使用窗口和速率相結閤的流控機製，提供麵嚮連接的可靠傳輸服務；參攷uip優化狀態機製、重傳隊列機製、確認機製和擁塞控製算法。實驗結果錶明，該教室繫統內文件傳輸速度方麵相比嵌入式TCP/IP有較大提高，有效實現瞭實時性原圖作業交互。
침대감입식평태국역망협의、사생가첩사작업원도교호등문제，근거국역망내부감입식설비실시통신련로상태상대교호，경건자원요구불고등특정，설계감입식습자교실계통。감입식국역망협의（ELP）재이태망정상확전8자절자단적포두；사용본지화원정적단구호화MAC지지래표식일개련접；사용창구화속솔상결합적류공궤제，제공면향련접적가고전수복무；삼고uip우화상태궤제、중전대렬궤제、학인궤제화옹새공제산법。실험결과표명，해교실계통내문건전수속도방면상비감입식TCP/IP유교대제고，유효실현료실시성원도작업교호。
This paper aims at designing a LAN protocol based on embedded platform on which teachers and students can write overlapping original interaction of writing exercises, considering the state of communication channel in local area network and constraints on computation. This method is comprised by the following techniques: 8 Byte packet header expansion towards ELP(Embedded LAN Protocol), linkage identification based on local-remote port number and MAC address, traffic control based on the integration of windowing and flow, reference optimization of state mechanism, retransmission queue mechanism, ACK mechanism and congestion control algorithm of uip et al. Experimental results show that the file transfer rate of the classroom-system is higher than embedded TCP/IP and has good effect on interaction of writing exercises.
