Patent ID: 7324830

Claim:
A method in a first mobile station comprising: providing in storage area in the first mobile station a mapping table for storing permanent address information and network identification information for a plurality of associate mobile stations that connect to a wireless network, the network identification information being dynamically assigned by the wireless network; storing in the mapping table the permanent address information for all of the associate mobile stations and the network identification information for at least two of the associate mobile stations, the network identification information being received from the associate mobile station via a communication path that utilizes a first service gateway type; receiving and storing a first network identification code for the first mobile station that is different from a previously assigned first network identification code; detecting that the first network identification code is different from the previously assigned first network identification code; and transmitting to all associate mobile stations, in response to the detecting step, the first network identification code of the first mobile station via predetermined communication paths using the permanent address information of the associate mobile stations and at least the first service gateway type or a second gateway type.