Abstract: The topology optimization of CCS7 network in China is studied, several mathematical models are built in light of the decomposition of the problem, and correspondent algorithms are provided. The computing resultswith the network of 123 nodes show that the models and algorithms are quite satisfied, the partition of 9 to 12 signaling regions is suitable and economical inChina, and the location and matching of HTSPs are reasonable.

Key words: No.7 signaling, signaling networks, topology optimization