| 摘要 |
A communication system of the type in which a base station, which can take the form of an electronic tag, is used to send data to users of wireless mobile units. The tags are used in environments such as on poster panels and in football grounds to deliver information relevant to that environment, e.g. information concerning the product advertised on the poster. A problem is that people who do not want the information offered by the base station will receive an invitation that they regard as a nuisance leading to negative association towards the brand. The invention seeks to overcome this problem by transmitting an enquiry signal at a relatively low power so that only mobile units in relatively close proximity to the base station will receive an invitation but uses a relatively high power when transmitting information to mobile units that have accepted the invitation.
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