Handover method for next generation mobile communication system having overlapping area

A handover method for an Internet protocol (IP)-based next generation mobile communication system arranging in borders between access routers managing cell groups an overlapping area to which all of the neighboring access routers have access, the handover method comprising the steps of:

• 1) determining whether a predetermined mobile terminal goes into the overlapping area;
• 2) starting a Layer 3 (L3) handover operation between the neighboring access routers as the mobile terminal goes into the overlapping area;
• 3) if the Layer 3 handover operation between the neighboring access routers is completed, establishing a data path for the mobile terminal to pass through an access router after the Layer 3 handover;
• 4) if the mobile terminal leaves a cell area including the mobile terminal in steps 2) and 3), performing Layer 2 handover in the mobile terminal between cells and data through a cell base station to the mobile terminal after the Layer 2 handover and through an access router to the mobile terminal before the Layer 3 handover;
• and
• 5) if the mobile terminal leaves the cell area including the mobile terminal after step 3), performing the Layer 2 handover in the mobile terminal between cells and receiving data through the cell base station to the mobile terminal after the Layer 2 handover and through an access router to the mobile terminal after the Layer 3 handover.

A handover method for an Internet protocol (IP)-based next generation mobile communication system, the handover method comprising the steps of:

• arranging at borders between access routers managing cell groups, an overlapping area to which all of the neighboring access routers have access;
• and
• if a predetermined terminal enters the overlapping area, performing Layer 3 (L3) handover between the neighboring access routers with respect to the mobile terminal,
• wherein the mobile terminal independently performs Layer 2 (L2) handover according to movement between cells from execution of the L3 handover.