CAJ | 학술논문

空间网络具有传播延时长、信道丢包率高等特点，使得传统的地面路由协议TCP协议难以适应于空间网络。 CTCP是一种结合网络编码技术的新型传输协议，实验表明在高丢包率的空间网络环境中的性能要优于传统的TCP协议。但由于CTCP的拥塞控制方式类似于TCP-Reno，拥塞窗口的调整是静态设定的，使得CTCP的拥塞控制机制在多变复杂的空间网络环境效果并不理想。本文提出一种基于CTCP的动态调整拥塞控制算法H-CTCP，通过对空间网络中的可用带宽进行实时估算，动态设定拥塞窗口。实验证明，改进后的拥塞控制算法更能适应高丢包率的空间网络环境，大大提高CTCP的传输性能。
공간망락구유전파연시장、신도주포솔고등특점，사득전통적지면로유협의TCP협의난이괄응우공간망락。 CTCP시일충결합망락편마기술적신형전수협의，실험표명재고주포솔적공간망락배경중적성능요우우전통적TCP협의。단유우CTCP적옹새공제방식유사우TCP-Reno，옹새창구적조정시정태설정적，사득CTCP적옹새공제궤제재다변복잡적공간망락배경효과병불이상。본문제출일충기우CTCP적동태조정옹새공제산법H-CTCP，통과대공간망락중적가용대관진행실시고산，동태설정옹새창구。실험증명，개진후적옹새공제산법경능괄응고주포솔적공간망락배경，대대제고CTCP적전수성능。
Space network has some characteristics , such as long transmission delay and high packet loss rate , which lead it diffi-cult to use ground routing protocols in space network completely .CTCP is a new transport protocol using network coding technolo-gy, and experiment shows that its performance in space network environment is better than TCP ’s.However, CTCP’s congestion control mechanism is similar to TCP-Reno’ s, which congestion window is set statically , causes the result that the performance of CTCP’ s congestion control in the complex network environment is not ideal .This paper presents a dynamically adjustive conges-tion control algorithm H-CTCP based on CTCP , which in real-time estimates the available bandwidth in space network , and dy-namically sets the congestion window .Experimental results indicated that the improved congestion control algorithm H -CTCP is more suitable in space network of high packet loss rate , and increased transmission performance .