| 摘要 |
A system ( 100 ) includes a wireless device ( 101 ) and at least one transponder ( 102 ). The wireless device ( 101 ) includes a memory ( 201 ) with an area ( 202 ) for storing coupling range profiles, a processor ( 203 ), a bus ( 210 ), a receiver ( 206 ), a transmitter ( 205 ), an alarm ( 208 ), a location module ( 209 ), a user interface ( 211 ), an antenna ( 212 ) for receiving transmitted location information, a power controller ( 204 ), an antenna ( 207 ) for transmitting and receiving, and a clock ( 213 ). The transponder includes a memory ( 301 ) with an area ( 302 ) for storing a unique transponder ID, a processor ( 303 ), a bus ( 308 ), power controller ( 304 ), a receiver ( 306 ), transmitter ( 305 ), and an antenna ( 307 ). The wireless device ( 101 ) compares current context information to a coupling range profile and, based on the results of the comparison, transmits to at least one transponder ( 102 ) at an appropriate power level. If the transponder ( 102 ) is within the predetermined range, it will transmit and the wireless device ( 101 ) will receive a response signal. If the current location context changes, the wireless device ( 101 ) will automatically affect a change in coupling distance to the transponder ( 102 ).
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