Methods and Apparatus for Mobility Influenced Handoff
First Claim
Patent Images
1. A method of handoff in a wireless system, the method comprising:
- determining a first value of a mobility factor indicative of a relative motion of a subscriber station communicating using a first service type;
determining an availability of an alternative service type; and
transferring communications to the alternative service type if the first value indicates that the subscriber station has been in a low mobility state for at least a predetermined period of time.
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Abstract
In a wireless communication system, a mobility factor is used to influence handoff. If a subscriber station has been in a low mobility state for some period of time, the system may handoff operation from a first service type to a second service type. If the mobility factor indicates that the subscriber station is moving, the system may handoff operation from the second service type back to the first service type.
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Citations
20 Claims
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1. A method of handoff in a wireless system, the method comprising:
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determining a first value of a mobility factor indicative of a relative motion of a subscriber station communicating using a first service type; determining an availability of an alternative service type; and transferring communications to the alternative service type if the first value indicates that the subscriber station has been in a low mobility state for at least a predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A processor-readable storage medium containing one or more instructions for a processor, the processor executing the one or more instructions performing the method comprising:
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determining a first value of a mobility factor indicative of a relative motion of a subscriber station communicating using a first service type; determining an availability of an alternative service type; and transferring communications to the alternative service type if the first value indicates that the subscriber station has been in a low mobility state for at least a predetermined period of time.
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10. A subscriber station comprising:
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means for determining a first value of a mobility factor indicative of a relative motion of the subscriber station communicating using a first service type; means for determining an availability of an alternative service type; and means for transferring communications to the alternative service type if the first value indicates that the subscriber station has been in a low mobility state for some period of time.
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11. A base station comprising:
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a monitoring module that determines a mobility factor of a subscriber station serviced over a first service type; a timing module that generates a handoff indication based on the mobility factor when the subscriber station has been in a low mobility state for an extend period of time; and a message generator coupled to the timing module that sends a command to the subscriber station commanding the subscriber station to report an availability of an alternative service type in response to the handoff indication.
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12. A subscriber station comprising:
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a monitoring module that determines a mobility factor indicative of subscriber station motion; a timing module that generates a handoff indication based on the mobility factor when the subscriber station has been in a low mobility state for an extend period of time; a scanner that searches for a second service type and determines the availability of the second service type; and a message generator that requests a handoff to the second service type in response to the handoff indication. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A communication system comprising:
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a base station that offers licensed service and license exempt service; and a subscriber station capable of wirelessly communicating with the base station over both licensed service and license exempt service and that determines to handoff from the licensed service to the license exempt service based in part on a mobility factor. - View Dependent Claims (20)
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Specification