Handover is one of the key technology for mobile communication

it will directly affect the capacity and the quality of 3G system

smoothness handover in achieving continuous without interruption communication of the mobile terminal is essential. Based on the analysis of mobile communication handover technology

this paper concentrates on the networking solutions of 3G indoor coverage and the design methods of handover

the details of sub-area and handover region design

especially the solutions of indoor coverage of more sub-area inter-frequency combined with intra-frequency are presented. The discussion could provide certain reference and help for engineering construction of 3G In-building coverage networking.