Interaction of HLA and TCP/IP subsystems in C^3I system

Aiming to the fact that the distribution modules of the C31 simulation system originally developed based on TCP/IP protocol has to be compatible with the present HLA （High Level of Architecture） rules, three methods for implementing the interaction of HLA and TCP/IP subsystems are presented to make the original TCP/IP modules directly used in the HLA-based C^3I system without redevelopment. The three methods are agent method, middlewarc method and gateway method. Moreover, the implementation of gateway method via VC ＋＋ as well as the key technology is discussed.