ATN传输层网关的研究

Research of ATN Transport Gateway

为解决开放系统互连协议(OSI)主机与传输控制协议/网际协议(TCP/IP)主机互联互通,国际标准化组织开发环境(ISODE)建议方法为传输层网桥,但该方法要求重新编写主机传输层应用编程接口(API).在对比分析TCP和4类传输协议(TP4)特性后,提出了一种具有TCP和TP4协议转换功能的传输层网关设计方法.与网桥方法相比,此方法具有主机软件移植复杂度更低的优点.此外,所设计的自适应算法通过动态调整TCP、TP4流控窗口实现了传输层网关的拥塞控制,并自动平滑2种网络速率差异.经下一代航空电信网(ATN)试验网测试表明,该网关能有效实现异构主机互联并保证了传输服务质量.

Although the transport bridge proposed by international standardization organization development environment (ISODE) is a workable solution which interconnects the open system interconnection (OSI) hosts with the transmission control protocol/Internet protocol (TCP/IP) hosts, it requires that the transport application protocol interface (API) in the TCP hosts should be rewritten. A new transport gateway approach with better portability is proposed which implements the protocol translation function between TCP and transport protocol 4 (TP4). Furthermore, a novel adaptive congestion control algorithm is designed in the gateway which smoothes the rate difference between TCP and TP4 automatically through adjusting the flow control window dynamically. The test in the aeronautical telecommunication network (ATN) validates that the gateway achieves good performance with quality of service (QoS) guaranteed.