Abstract: The boundary switching of local mobile network composed of different equipments is hard switching most of the time.The author has opitized and designed the CDMA boundary switching in Yongzhou and Hengyang of Hunan Province.Starting from analysing the reasons for high dropped call rate caused by boundary switching,the author has analyzed and changed the switching mannar.Through reasonable setting the wireless switching parameters,scientific configuration of MSCe date in Yongzhou and MSC data in Hengyang,and wireless side data,the CDMA network boundary switching in Yongzhou and Hengyang is solved through test validation and signaling analysis.

Key words: CDMA, boundary, hard switching, optimization, design