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Apparatus to enable fallback to circuit switched domain from packet switched domain

  • US 9,848,358 B2
  • Filed: 11/01/2013
  • Issued: 12/19/2017
  • Est. Priority Date: 03/21/2008
  • Status: Active Grant
First Claim
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1. A wireless transmit/receive unit (WTRU), comprising:

  • a transmitter configured to transmit a service request to an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN); and

    a processor, coupled to the transmitter, the processor configured to implement a Non-Access Stratum (NAS) layer to;

    determine to request a Circuit Switched (CS) fallback;

    generate, after the determining to request the CS fallback, the service request including a request to perform the CS fallback and CS service information; and

    receive, from another layer of the WTRU, an indication of a mode change to one of;

    an A/Gb mode or an Iu mode, as a notification of completion of the CS fallback.

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