Method and system for station location based neighbor determination and handover probability estimation
First Claim
1. A method for dynamic estimation of probability and initiation time for handover of a station (STA) in a wireless communication system having a serving access point (AP) and a plurality of neighboring APs, the method comprising:
- determining the location of the STA and speed and direction of movement;
reporting coordinates of cell boundaries of neighboring APs;
the STA sending a request for system information to the serving AP;
the serving AP providing the system information; and
determining probability of handover to each neighboring AP and an estimate of the initiation time for handover based on the STA location and speed and direction of movement and the cell boundary coordinates.
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Abstract
The present invention is a method and system for station location based neighbor determination and handover probability estimation. A serving access point determines the location and movement measurements of a station (STA). Neighboring access points report coordinates of cell fringes of the neighboring access points. The STA sends a request for system information to the current access point along with current location of the STA. The current access point provides the system information, and the STA utilizes the system information to determine best handover candidate from among neighboring access points and an estimate of the time for handover.
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Citations
20 Claims
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1. A method for dynamic estimation of probability and initiation time for handover of a station (STA) in a wireless communication system having a serving access point (AP) and a plurality of neighboring APs, the method comprising:
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determining the location of the STA and speed and direction of movement;
reporting coordinates of cell boundaries of neighboring APs;
the STA sending a request for system information to the serving AP;
the serving AP providing the system information; and
determining probability of handover to each neighboring AP and an estimate of the initiation time for handover based on the STA location and speed and direction of movement and the cell boundary coordinates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for dynamic estimation of probability and initiation time for handover of a station (STA) in a wireless communication network having an access controller (AC), a serving access point (AP) and a plurality of neighboring APs, the method comprising:
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determining the location and direction of movement of the STA by the AC;
reporting coordinates of cell boundaries of neighboring APs;
the STA sending a request for system information to the AC;
the serving AC providing the system information; and
the STA utilizing the system information to determine probability of handover to each neighboring AP and an estimate of the initiation time for handover. - View Dependent Claims (12, 13)
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14. In a wireless network having a plurality of access points, a mobile wireless transmit/receive unit (WTRU), comprising:
a processor configured to determine geographical coordinates of the WTRU, determine signal strengths of signals received from neighboring access points, and calculate a probability of handover for at least one neighboring access point. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A wireless network having a plurality of access points (AP), comprising:
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a mobile station (STA) configured to determine its geographical coordinates and its speed and direction of movement;
an access controller configured to report network topology information to the STA including cell boundaries of the APs; and
a serving access point (AP) configured to handover the STA to the target AP according to an estimated handover initiation time;
wherein the STA estimates the handover initiation time based on the network topology information and the determination of speed and direction of movement.
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Specification