Patent ID: 8467787

Claim:
A method for searching for modes and frequencies by a User Equipment (UE), the method comprising: obtaining, by the UE, signal energy of all frequency grids within a frequency range; obtaining for each mode, using the obtained signal energy of all frequency grids, the signal energy in each of a plurality of smallest bandwidths within the mode over the frequency range; sorting the energy on the smallest bandwidths of all modes; accessing a specified number of frequencies and modes of highest energy in the sorting result; and wherein obtaining the signal energy in each of a plurality of smallest bandwidths within the mode over the frequency range comprises: opening a window according to the smallest bandwidth of a selected mode, wherein the number of the frequency grids included in the window is equal to the number of the frequency grids of the smallest bandwidth of the selected mode, sliding over the frequency range the smallest bandwidth window by one frequency grid in each slide and obtaining a sum of signal energy of frequency grids in the smallest bandwidth window in each slide as the energy on each smallest bandwidth of the mode, and marking the energy on each smallest bandwidth of the mode according to the amount of energy.