A method for treating patients after a myocardial infarction which includes pacing therapy is disclosed. The antenna device includes a radiation patch in a shape of a flat plate, a first feed point configured in a side region of the radiation patch, and a second feed point configured in another side region of the radiation patch. A mobile node send a provisional new care-of-address with an aggregate prefix part to its previous access router, which forwards the address to a new access router.