Patent ID: 8125966
Filing Date: 2012-02-28
Classification: H04L,H04W

Abstract:
1. A method of handing over a call involving a mobile equipment that has set up an IP call with a communication equipment via an agent equipment providing a home agent function for said mobile equipment, an anchor point including a control device configured to analyze an information bit and to temporarily store a first and a second local care-of address in corresponding relationship to a same regional care of address used to transfer identical data in parallel to the mobile equipment as designated by the first and a second local care-of addresses such that the local care-of address and the regional care-of address are used by the anchor point and the mobile equipment, respectively, and a first radio access equipment belonging to an Internet Protocol communication network using hierarchical mobility management, said mobile equipment having the first local and the regional care-of addresses stored at said anchor point, said method of handing a call over comprising: detecting, by said mobile equipment, a second access equipment connected to said anchor point; receiving, by said mobile equipment, the address prefix of said second access equipment; constructing, by said mobile equipment, the second local care-of address based on the address prefix of said second access equipment, using a stateless autoconfiguration procedure; communicating, by said mobile equipment, said second local care-of address, said first regional care-of address and the information bit having a value indicating double temporary addressing to said anchor point in order for said anchor point to store the second local care-of address in relationship to the first regional care-of address; receiving, by said mobile equipment, packets addressed to said mobile equipment via the first and second access equipments and designated by said first and second local care-of addresses; and communicating using a local binding update type message, by said mobile equipment, a message requesting the anchor point to disconnect said mobile equipment from the first access equipment and to delete the first local care-of address of the mobile equipment stored at said anchor point in order to forward packets that are addressed to said anchor point to the mobile equipment via said home agent equipment, said anchor point and said second access equipment.