摘要 |
Location information about a communicating entity ( 41 ), in particular a mobile entity, is derived by identifying intermediate nodes ( 42 ) along the communication path being used by the entity, and then looking up, in a database ( 44 ), the geographic significance of at least one of these nodes when considered in a direction along the communication path towards the entity of interest. Preferably, account is taken of any identified downstream/upstream nodes to refine the geographic significance of a node. The geographic significance information can be compiled by taking location fixes at a plurality of endpoint locations and associating the location data thus obtained with the intermediate nodes traversed when communication is effected from the corresponding endpoint locations.
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