Patent ID: 7606201

Claim:
A system for enabling a handover in a data communications network of a mobile node (MN), the MN having a home address HoA, the system comprising: a current serving access router (PAR) with which the MN has a first address, the first address being different from the HoA; a next serving access router (NAR) with which the MN is capable of forming a second address, wherein at least one tunnel is present between the PAR and the NAR to enable data exchange therebetween; the MN: sends a handover request towards the PAR; and completes the handover with the NAR without discarding its first address; the PAR: forwards traffic received for the MN on its first address on the tunnel; and the NAR: following completion of the handover of the MN with the NAR, forwards traffic received for the MN on the tunnel to the first address of the MN.