Provided is a method of getting an energy level of a communication channel including skipping two channels and performing energy detection scanning when an energy level higher than an energy threshold of a wireless LAN network is detected during a process of sequentially performing the energy detection scanning according to channels, reducing a time consumed for the energy detection scanning. The semiconductor integrated circuit includes: a cladding layer disposed on a semiconductor substrate; a grating coupler including an optical waveguide on the cladding layer and a grating on the optical waveguide; and at least one reflector formed in the cladding layer below the grating. The channel region includes a first region adjacent to the source region and a second region adjacent to the drain region. The airbag-attaching portion faces the inflator bracket with a gap therebetween. The mobile subscribers each have a home region. The helical fractionating column has many advantages, such as having enhanced integrity of separation, decoloration and deodorization, simple structure, convenient manufacturing and maintenance, and low investment cost as well as high product quality etc.