Nokia Siemens Networks Oy

Nokia Siemens Networks S.p.a.

Wartsila Finland Oy

Alessandro De Sanctis

Daniele Tortora

Marco Rastelli

Euro Strain

Giorgio Zarattini

Odorico Contento

To prevent a handover ping-pong effect between base-station in WiMAX-compliant networks, a priority level is assigned to the trigger causes for handover, and the prioritized causes are coded. Then codes are subdivided into a first class of unrestricted handovers and a second class of restricted handovers. The first class includes the highest priority handovers. The second class includes a subset of handovers with a high or normal priority intended for optimizing resources. Outside this subset the second class also includes handovers for power budget having a normal priority level. When an outgoing handover is decided, the actual serving BS permits or selectively suppresses the Handover Request to the target BS when the latter corresponds to the preceding serving BS for that mobile. The selection mechanism operates on the second class of restricted handovers, during a penalty time triggered by the occurrence of handover causes included in the second class subset.

Method for preventing ping-pong handover effect in mobile WiMAX networks

Growing community of inventors

Milan, Italy

Alessandro De Sanctis