Patent ID: 6987743

Claim:
In a third generation mobile telecommunications network, a method of delivering packets in layer 2 to a mobile node in a foreign network comprises the steps of: providing an Address Resolution Protocol (ARP) entity; setting up a home agent in a home network of the mobile node; allocating a Care of Address to the mobile node; and setting up a Dynamic Host Configuration Protocol (DHCP); setting up a proxy ARP entity; informing the proxy ARP entity of the Care of Address and the Media Access Control address of the mobile node,in which packets are transmitted from a correspondent node to the mobile node and the Care of Address is a Collocated Care of Address comprising the further steps of: a last routing switch in the foreign network broadcasting an ARP request; the proxy ARP responding with an ARP reply message containing the MAC address of the mobile node; the last routing switch updating its ARP cache table by adding a unique mapping between the Care of Address and the MAC address of the mobile node; and the last routing switch delivering the packet to said MAC address.