Patent ID: 6519235
Filing Date: 2003-02-11
Classification: H04W

Abstract:
A method of providing a handoff during a mobile radio communication packet data service including a plurality of radio network controllers(RNCs), a plurality of packet data gateway nodes (PDGNs), and at least one mobile switching center (MSC), the handoff providing method comprising the steps of:instructing a handoff to the PDGN through the mobile switching center utilizing a network identification address of a previous RNC if a certain mobile station moves into a region of a new RNC in a state that a point-to-point protocol (PPP) link set between the mobile station and the PDGN is in an active state; the PDGN inquiry for performing the handoff utilizing terminal node identifiers (TNIDs) to a new RNC; the new RNC informing to the PDGN a network identification address of the new RNC and the terminal node identifier; transmitting the packet data utilizing the packet router between the new RNC and the PDGN; the previous RNC instructing the PDGN a handoff utilizing the network identification address of the mobile switching center if a certain mobile station moves into a region of a new mobile switching center in a state that the PPP link set between the mobile station and the PDGN is in the active state; the new mobile switching center informing the PDGN of the network identification address of the new mobile switching center; and transmitting the packet data using the packet router between the new mobile switching center and the PDGN.