| 摘要 |
<p>The present invention relates to an art which effectively realizes a security service for a prescribed security space such as a home, an office, etc. by connecting to a broadband network such as the internet and a mobile communication network. More specifically, the present invention assumes detection of a Doppler shift of a security space in a wireless LAN access point widely distributed nowadays to be an attention-requiring situation such as trespassing from the outside, notifies a user of the detection on a smartphone via a broadband network, and provides an indoor camera photograph image. Afterwards, if the user confirms the Doppler shift to be an attention-requiring situation, a security service (e.g., dispatch of a security guard) is operated. Specifically, the present invention adaptively controls an OFDM subcarrier in the wireless LAN access point to achieve optimization between trespassing detection performance and a standby power source, and tracks a trespasser in the security area through magnetic propagation signal identification of the access point by a wireless LAN beacon frame.</p> |
