Methods and apparatus for performing handoff based on the mobility of a subscriber station

  • US 9,888,425 B2
  • Filed: 03/14/2017
  • Issued: 02/06/2018
  • Est. Priority Date: 03/21/2007
  • Status: Active Grant
First Claim
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1. A subscriber station comprising:

  • a front end module configured to establish a service with a base station via a non-licensed spectrum, and to transmit a message to the base station to determine availability of the service via a licensed spectrum;

    a mobility monitoring module configured to;

    determine a first value of a mobility factor of the subscriber station communicating with the base station using the non-licensed spectrum; and

    determine the availability of the service via the licensed spectrum from the base station;

    wherein the front end module is further configured to initiate transfer of the service to the licensed spectrum if the first value of the mobility factor indicates that the subscriber station has been in a high mobility state for at least a predetermined period of time; and

    wherein the mobility factor is determined from values of one or more metrics concerning communications between the base station and the subscriber station, said metrics including one or more of frequency offsets, correlations of known signals, and variation of received signal power.

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