| 摘要 |
A tag has a receiver section, a transmitter section, and a further section, the further section being responsive to receipt by the receiver section of a wireless signpost signal from one signpost in a group of signposts for thereafter inhibiting transmission of tag signals by the transmitter section pending receipt by the receiver section of a respective signpost signal from each signpost in the group. A different configuration includes a tag having a receiver section, a transmitter section, and a further section, the further section inhibiting transmission of tag signals by the transmitter section during a time period that ends as a function of the absence of receipt by the receiver section of signpost signals, the further section responding to receipt of signpost signals by the receiver section during the time period by saving information relating to signposts that generated the signpost signals.
|
