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1.发明授权公开(公告)号：US09723649B2
公开(公告)日：2017-08-01
申请号：US14755527
申请日：2015-06-30
Applicant: Samsung Electronics Co., Ltd.
Inventor： Bharat Bhat , Anand Biradar , Ananth Kumar Ramasamy
Abstract: A method and an apparatus are provided for improving availability of a circuit switched (CS) service to a user equipment (UE). The UE sends at least one location area update (LAU) message, to a core network (CN), to initiate an LAU procedure. A release of a CS signaling connection between the UE and the CN is detected due to a failure in the LAU procedure. An ongoing PS signaling connection between the UE and the CN is identified, when the CS signaling connection between the UE and the CN is released. The ongoing PS signaling connection is released. A public land mobile network (PLMN) is selected for obtaining CS services from the core network, when the ongoing PS signaling connection is released.
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公开(公告)号：US09992810B2
公开(公告)日：2018-06-05
申请号：US15221181
申请日：2016-07-27
Applicant: Samsung Electronics Co., Ltd.
Inventor： Ananth Kumar Ramasamy , Bharat Vinayak Bhat , Nitin Jain
CPC classification number: H04W76/18 , H04W4/16 , H04W8/183 , H04W68/02 , H04W76/16 , H04W76/27 , H04W88/06
Abstract: Methods and apparatuses are provided for providing integrity protection in a dual subscriber identity module (SIM) dual standby (DSDS) device. A first message is received on a first SIM of the DSDS device before a radio resource of the DSDS device is tuned away from the first SIM to a second SIM by performing a tune-away procedure. A second message is received after completion of the tune-away procedure. The second message is validated. It is determined whether a first payload of the first message matches a second payload of the second message, when the first message and the second message have a same message sequence number. It is determined that the second message is a duplicate message, when the first payload matches the second payload.
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