| 摘要 |
The present invention relates to a method and system of computer communication through an infrastructure multicast IP network, between one or several determined central stations and undetermined groups of receiving stations, especially mobile stations. According to the invention, every mobile station sends its geographical status, e.g. its position, in an IP unicast message to the central station. In response, the mobile station receives an IP unicast message comprising one or more IP multicast addresses corresponding to the transmitted geographical status. The central station also has the necessary routers subscribed or unsubscribed to these multicast addresses, according to the local presence of such receiving stations. Receiving stations may then subscribe such localized multicast addresses, and receive the corresponding multicast messages.
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