Apparatus, and associated method, for improvement in facilitating routing of data by a mobile node operable in a packet radio communication system

Apparatus for a packet radio communication system having a network part formed of a first network portion and at least a second network portion and a mobile node selectably operable to communicate data by way of the first network portion when positioned within a first coverage area associated with the first network portion and to communicate data by way of the at least the second network portion when positioned within at least a second coverage area associated with the at least the second network portion, the network part including a registration entity having at least a first registration entity list, said apparatus for facilitating routing of the data packets originated by the mobile node, when the mobile node is positioned in any of the first and at least second coverage areas, for delivery to a data destination, said apparatus comprising:

• a clone-list depository embodied at the mobile node, said clone-list depository for storing a clone list provided to the mobile node, the clone list stored at the mobile node and including a copy of a selected one of the first registration entity list, the clone list comprised of routing information that is used by the mobile node to populate header portions of data packets that are formed and formatted at the mobile node and which provide information by which data packets originated by the mobile node can be routed to a destination for said data packets when said mobile node is positioned at any location within a selected one of the first and at least second coverage areas, the clone list provided to the mobile node dependent, in part, upon in which of the first and at least second coverage areas that the mobile node is positioned;
• an accessor, which accesses entries of the clone list stored at said clone-list depository, the entries accessed by said accessor being used to route the data packets originated by the mobile node through a network part in which the mobile node is located;
• a header formatter, which receives routing information from the accessor is provided, said header formatter formatting data packages to include routing information from the clone list and providing formatted data packets to a transmit part of the mobile node;
• and
• wherein the mobile node is selectably operable to generate and send a registration request to request registration of the mobile node with the network part of the communication system, and wherein the clone list is provided to the mobile node, and stored at said clone-list depository responsive to receipt of the registration request at the network part.