Dynamic offset threshold for diversity handover in telecommunications system
First Claim
1. For use in a telecommunications system having a source base station and a destination base station where a specified mobile station establishes a connection with the source base station, a method comprising:
- determining a dynamic offset threshold for starting at least a portion of a soft handover sequence for the specified mobile station at the destination base station, the dynamic offset threshold being a function of a probability that the specified mobile station will engage in soft handover;
initiating the at least a portion of the soft handover sequence when a signal strength from the destination base station as received at the specified mobile station has predetermined relationship to the dynamic offset threshold.
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Accused Products
Abstract
A telecommunications system has a source base station (BSS) and a destination base station (BSD), and a handover unit (100) having a dynamic offset threshold determination unit (102) which establishes a dynamic offset threshold for starting soft handover. When the dynamic offset threshold for soft handover is exceeded, a preliminary portion of a handover sequence is initiated at the destination base station. The preliminary portion of the handover sequence is initiated so that a time-critical handover sequence activity (such as L1 uplink synchronization) is well underway, if not completed, by the time the soft handover is actually needed. The dynamic offset threshold for starting handover is based on a probability that the mobile station will engage in the handover. The probability is a statistical probability that handover will actually occur based on handover history of other mobile stations previously and similarly traveling and of the same signal strength. Another portion of the soft handover sequence (e.g., a remaining portion of the soft handover sequence) is initiated when the signal strength from the destination base station as received at the specified mobile station has a predetermined relationship to a fixed offset threshold.
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Citations
21 Claims
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1. For use in a telecommunications system having a source base station and a destination base station where a specified mobile station establishes a connection with the source base station, a method comprising:
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determining a dynamic offset threshold for starting at least a portion of a soft handover sequence for the specified mobile station at the destination base station, the dynamic offset threshold being a function of a probability that the specified mobile station will engage in soft handover;
initiating the at least a portion of the soft handover sequence when a signal strength from the destination base station as received at the specified mobile station has predetermined relationship to the dynamic offset threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A telecommunications system comprising:
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a source base station;
a destination base station;
a dynamic offset threshold determination unit which determines a dynamic offset threshold for starting at least a portion of a soft handover sequence for the specified mobile station at the destination base station, the dynamic offset threshold being a function of a probability that the specified mobile station will engage in soft handover. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification