Location dependent messaging

摘要

A first message M1 is made location dependent by associating it with a geographical area e.g. A1. The message is divided into portions and the separate portions are stored only by some or all of the mobile transceiver devices 10, 12 and 14 within the area A1. When a mobile transceiver device leaves the area A1 then the portion(s) of M1 that it stores (if any) are transferred to one or more mobile transceiver devices that are presently within the area A1. The portions of the message M1 are therefore stored in a first adaptive database that comprises an ad-hoc network of transceiver devices 10, 12, 14 that are distributed over an area A1 associated with the message M1. The first database can be queried by a mobile radio transceiver to retrieve the message M1.