SYSTEM AND METHOD FOR DETERMINING ESTABLISHMENT CAUSES FOR EMERGENCY SESSIONS
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United States of America Patent
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Issued Date -
Feb 1, 2018
app pub date -
Oct 4, 2017
filing date -
Oct 2, 2009
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Abstract
A method for initiating a Packet Switched emergency call using a user equipment (UE) is presented. The UE includes a plurality of protocol layers. The plurality of protocol layers including an IMS sublayer, a non-access stratum (NAS) layer and an access stratum (AS) layer. The method includes generating an ATTACH REQUEST using the UE. The ATTACH REQUEST has an attach type. The method includes retrieving the attach type of the ATTACH REQUEST using the NAS layer of the UE, and generating an RRC CONNECTION REQUEST. The RRC CONNECTION REQUEST includes an RRC establishment cause based upon the attach type of the attach request.
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