Patent ID: 9148824
Filing Date: 2015-09-29
Classification: H04W

Abstract:
1. A method in a radio telecommunications network for controlling Packet Switched (PS) handover based Circuit Switched Fall Back, CSFB, of a mobile station from an Evolved Universal Terrestrial Radio Access Network, E-UTRAN, serving cell to a target Universal Terrestrial Radio Access Network, UTRAN, cell or a target GSM EDGE Radio Access Network, GERAN, cell in a PS domain, the method comprising the steps of: receiving a handover request from a Serving GPRS Support Node, SGSN; identifying a Public Land Mobile Network, PLMN, ID associated with the SGSN responsive to the handover request; identifying a set of a plurality of PLMN IDs transmitted as system information by the target UTRAN cell or the target GERAN cell; generating a PLMN ID index that indicates an association between the PLMN ID associated with the SGSN and one of the PLMN IDs of the set; and communicating the PLMN ID index in a handover command sent to the mobile station during the PS handover based CSFB.