The majority of 3G service occurs in the indoor environment

which is reported in the NTT DoCoMo’s statistics. There is a big amount indoor coverage BTS in the 2G mobile network

so TD-SCDMA indoor coverage network update should not alter original equipment as far as possible. It is dicussed in this paper that indicate the points for attentions in TD-SCDMA and 2G co-existing indoor coverage mobile network

and cite an example.