Patent ID: 8792907

Claim:
A method of receiving a message at a movable unit in a wireless mobile network, comprising: determining, using a processor, a potential trajectory of the movable unit over a pre-determined time period, the determining including: adding a current spatial position of the movable unit to a trajectory history of the movable unit, identifying, from the trajectory history, paths that cross into a target geographical region, tracing the identified paths away from the target geographical region for the pre-determined time period to establish a set of candidate path segments, determining a radial distance of the current spatial position of the movable unit, identifying a path segment, among the set of candidate path segments, that falls within the radial distance of the current spatial position of the movable unit, computing a travel direction for the movable unit based on the trajectory history, and selecting the identified path segment that falls within the radial distance of the current spatial position as the potential trajectory; receiving at the movable unit, a generally broadcast message relating to the target geographical region; storing the generally broadcast-message at the movable unit; and outputting the generally broadcast-message in response to the potential trajectory crossing into the target geographical region and falling within the radial distance of the current spatial position.