Methods for handing over, by double transmission of data, a call involving a mobile node in a micromobility or macromobility situation in an ip communication network using hierarchical mobility management

Abstract

A call handover method for an Internet Protocol communication network using hierarchical mobility management comprising a mobility anchor point connected to first and second access routers and to a home agent of a mobile node having first local and regional care-of addresses and communicating with another node consists in, if the mobile node detects the second access router: i) communicating the address prefix of the second access router to the mobile node in order for it to construct a second local care-of address, ii) communicating the second local care-of address, the first regional care-of address and an information bit having a value indicating double temporary addressing to the anchor point in order for it to store the second local care-of address in corresponding relationship to the first regional care-of address and then forward packets addressed to the mobile node to the first and second access routers, and iii) disconnecting the mobile node from the first access node and then deleting the first local care-of address of the mobile node stored at the anchor point in order to forward packets that are addressed to it to the mobile node via the home agent equipment, the anchor point and the second access router.