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    METHOD AND APPARATUS FOR HANDLING CIRCUIT SWITCHED CALLS AT A USER EQUIPMENT
    8.
    发明公开
    METHOD AND APPARATUS FOR HANDLING CIRCUIT SWITCHED CALLS AT A USER EQUIPMENT 审中-实审

    公开(公告)号：EP4362548A2

    公开(公告)日：2024-05-01

    申请号：EP24156145.5

    申请日：2014-10-06

    申请人： BlackBerry Limited

    发明人： MAHMOOD, Hamid ,  WADJEU, Mathurin

    IPC分类号： H04W36/00

    CPC分类号： H04W60/005 ,  H04W76/18 ,  H04W76/16 ,  H04W88/06 ,  H04W36/144 ,  H04W36/00224

    摘要： A method at a user equipment comprising detecting that a CS service has been requested at the user equipment and determining if a most recent registration attempt or registration update attempt with a network of a first radio access technology, RAT, resulted in an abnormal state. If the abnormal state is detected, the method further includes reselecting to a network of a second RAT and registering with the network of the second RAT regardless of whether a tracking area code or a location area code of a last successful network registration matches the tracking area code or location area code in a broadcast message from the network of the second RAT. The registering includes transmission of an indicator to instruct the network of the second RAT not to release radio resources following completion of a location area update. The method further includes initiating the CS service with the network of the second RAT.