Patent ID: 6928284
Filing Date: 2005-08-09
Classification: H04W

Abstract:
1. A method of handover of a call with a user equipment (UE) in a telecommunication system comprising a plurality of radio network controllers (RNCs) each having an associated domain and being associated with a corresponding serving general packet radio service (GPRS) support node (SGSN) and an Internet Protocol (IP) network enabling the RNCs to connect to various of the SGSNs, upon the UE relocating from the domain of a serving RNC to the domain of a target RNC, the method comprising the steps of: (a) receiving a request to handover the call from a serving RNC and its associated SGSN to the target RNC and its associated SGSN; (b) if the call with the UE is a real-time call, directly rerouting the call from the SGSN associated with the serving RNC to the target RNC through the IP network but not through the SGSN associated with the target RNC; (c) if the call is no longer a real-time call, rerouting the call to the target RNC via the SGSN associated with the target RNC.