Method and apparatus to enable fallback to circuit switched domain from packet switched domain

Method and apparatus to enable fallback to circuit switched domain from packet switched domain

  • CN 101,978,736 B
  • Filed: 03/19/2009
  • Issued: 12/11/2013
  • Est. Priority Date: 03/21/2008
  • Status: Active Grant
First Claim
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1. a wireless transmitter/receiver unit (WTRU), this WTRU comprises:

  • Non-Access Stratum (NAS), this NAS is configured toDetermine whether executive circuit exchange (CS) rollback based on Internet Protocol (IP) IP multimedia subsystem, IMS (IMS) login state;

    AndIn the situation that described WTRU is affixed to the CS territory, send the CS service request, this CS service request is used to indicate the request to executive circuit exchange (CS) rollback;

    And Access Layer (AS), this AS is configured toReceive the CS service request from described NAS,Control (RRC) message with radio resource and send indication to described CS service request to evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access network (E-UTRAN), wherein said RRC message comprises the CS information on services;

    AndReceive switching command in response to described CS service request.

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