Patent ID: 6909895

Claim:
A method for performing a relocation procedure for a user equipment (UE) communicating in a packet oriented communication network and being movable therein, said packet oriented communication network comprising at least two serving nodes (SGSN 1 , SGSN 2 ) of a core network of said packet oriented communication network, each of which serving nodes being connected to at least one access network controller (RNC 1 , RNC 2 ) of a access network of said packet oriented communication network, each of which access network controllers being adapted to perform a communication with said user equipment (UE) within its coverage area, and each serving node being assigned to a respective routing area (RA 1 , RA 2 ), said method comprising the steps of: monitoring (S 100 ,S 200 ) the occurrence of a relocation condition, deciding (S 300 , S 400 ), whether said relocation condition is an inter serving node relocation condition, switching (S 400 ) the communication from a first access network controller (RNC 1 ) of a first serving node (SGSN 1 ) to a second access network controller (RNC 2 ) of a second serving node (SGSN 2 ), when the decision in said decision step (S 300 ) is positive; maintaining (S 500 ) the control of communication in the core network anchored in the first serving node (SGSN 1 ) while the communication connection is in a first state in which it stays as long as there are data to be transmitted; and changing (S 600 ) the control of communication in the core network to the second serving node (SGSN 2 ), when a changing condition is detected.