The invention relates to method and device for detecting a business time slot same frequency interference
cell. The method comprises the following steps: storing Midamble partial data on a
signal received by
user equipment in a business time slot by setting a same frequency
cell list; carrying out shift correlation on a basic Midamble code and the stored Midamble partial data of a detected same frequency
cell and obtaining a correlated power spectrum of each cell; then obtaining the multipath information of each Midamble code; calculating the correlated power of each Midamble code according tothe multipath information and the power spectrum and obtaining an average power value; repeating the steps and periodically judging whether the
signal still forms same frequency interference or not;and if the
signal does not meet the condition of the same frequency interference, deleting the signal from the same frequency cell
list. The detecting precision of the same frequency interference cellis greatly improved by introducing a multi-cell Midamble code correlated unit.