Handover determination in a mobile communications system
AssigneeMotorola, Inc.
InventorsJavier Escamilla, Javier Munoz Vidal, Pedro Guerediaga Escribano
Life of this patent
Estimating the term…
Abstract
A self-adaptive handover determination device (5) functions by taking into account by how much a handover threshold is exceeded based on a received quality or signal strength measurement. Averaged signal measurements are compared (7) with a first threshold (8) and those exceeding it are summed (9) and further compared (10) with a second threshold (11) which sets the handover trigger level. The invention has the advantages of a reduced call drop rate and of enabling a fast handover when the communication's link suffers a rapid deterioration in quality.
Claims7
A device for determining handover in a mobile communications system and comprising:
- an averager for receiving measurements of a communications signal parameter and for computing an average of said measurements;
- a first comparator, connected to an output of said averager, for detecting when said average exceeds a first threshold;
- a summer, connected to an output of said first comparator, for computing a cumulative sum of amounts by which successive average values exceed the first threshold and for resetting the cumulative sum if a computed average value is equal to or less than the first threshold;
- and
- a second comparator connected to an output of said summer for detecting when the cumulative sum exceeds the second threshold, thereby to generate a handover trigger signal.
A method for determining handover in a mobile communications system and including the steps of:
- receiving measurements of a communications signal parameter and computing an average of said measurements;
- determining if an average exceeds a first threshold;
- summing those average values which exceed the first threshold to produce a cumulative sum of amounts by which successive average values exceed the first threshold;
- resetting the cumulative sum if a computed average value is equal to or less than the first threshold;
- and
- determining if the cumulative sum exceeds a second threshold, thereby facilitating generation of a handover trigger signal.
Dependencies are inferred from the claim text.