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Determination of appropriate radio resource to be requested in case of a circuit-switched (CS) fallback procedure

  • US 10,172,045 B2
  • Filed: 12/21/2016
  • Issued: 01/01/2019
  • Est. Priority Date: 11/09/2009
  • Status: Active Grant
First Claim
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1. A method, the method comprising:

  • receiving, at a second network, from a wireless device, a request message for initiating establishment of an initial radio connection with the second network, wherein the request message identifies a channel type indication from a plurality of channel type indications, the channel type indication determined by the wireless device based on a particular circuit switched domain service from a plurality of circuit switched domain services, the wireless device transmits the request message in response to receiving, from a first wireless network, a paging message indicative of the particular circuit switched domain service, and the first wireless network is different than the second network, wherein the particular circuit switched domain service indicated in the paging message is in a first category of service including CS speech calls and CS services requiring a traffic channel or conversational resources, and the channel type indication identified in the request message is “

    half-rate traffic channel TCH/H or full-rate traffic channel TCH/F”

    .

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