Patent ID: 8542634

Claim:
A method for providing mobility to a mobile node within a packet based communications system, the method comprising: initiating a communication session between the mobile node and a corresponding node via a first access point providing a point of attachment; receiving in the mobile node from the first access point, a signed session information package comprising routing information relating to the communications session and being signed by the first access point changing by the mobile node, the point of attachment from the first access point to a further access point; sending the signed information package from the mobile node to the further access point; sending from the further access point to the first access point, a forwarding request message requesting the first access point to forward to the further access point any datagrams sent from the corresponding node to the mobile node; sending and receiving datagrams between the mobile node and the corresponding node via the further access point and the first access point acting as an anchor point for the communication session, wherein the sending an receiving datagrams further includes establishing by the first access point, a tunnel to the further access point; and tearing down the tunnel to the further access point and establishing by the first access point, a second tunnel to a second further access point upon receiving a second forwarding request message from the second further access point and upon verifying a signature of the second further access point contained in the second forwarding request message.