Patent ID: 7907948
Filing Date: 2011-03-15
Classification: H04L,H04W

Abstract:
1. A method of providing unlinkability to a mobile node in a session with a correspondent node, the method comprising the steps of: receiving a first update from said mobile node at said correspondent node, said first update comprising a first sequence value; said first update further comprises a first pseudo care-of address equal to a home address if said mobile node is in a home network for said mobile node or equal to a care-of address if said mobile node is in a foreign network; calculating at said correspondent node an expected sequence value based at least in part on said first sequence value, using a first hashing mechanism; creating at said correspondent node a table entry for said session, said table entry for storing said expected sequence value and storing said first pseudo care-of address in said table entry; receiving from said mobile node at said correspondent node a second update comprising a second sequence value, said second sequence value based at least in part on said first sequence value, using said first hashing mechanism; said second update further comprises a second pseudo care-of address equal to said home address if said mobile node is in said home network for said mobile node or equal to a new care-of address if said mobile node is in a new foreign network; said second update is sent responsive to a change of a location of said mobile node; identifying at said correspondent node said table entry by looking through said table for a match between said expected sequence value and said second sequence value; and overwriting said pseudo care-of address with said second pseudo care-of address in said table entry.