PENALTY OF CELL RESELECTION FOR A WIRELESS DEVICE
First Claim
1. An improved method for serving cell reselection by a mobile unit in a Hierarchical Cell Structure (HCS) wireless communications system, each cell in the HCS wireless communications system having an assigned HCS priority, the mobile unit comprising a Radio Resource Control (RRC) used to establish at least a radio bearer for receiving system information transmitted from the serving cell to the mobile unit when the mobile unit is within a service area of the serving cell, the method comprising:
- if the HCS priority of the serving cell equals the HCS priority of a candidate cell and the measured signal quality of the candidate cell is greater than the sum of a measured signal quality of the serving cell plus a system information supplied offset between the serving and the candidate cell plus a system information specified hysteresis value for the serving cell, starting a timer to apply a temporary offset to signal quality measurements of the candidate cell, the adjusted signal quality measurements used for ranking that candidate cell for reselection.
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Accused Products
Abstract
An improved device and method for determining when to start a timer that applies a temporary offset to a signal quality measurement of a cell that is a candidate for reselection in a 3GPP Hierarchical Cell Structured wireless communications system. For a cell ranking criterion R, the timer is started to apply the temporary offset according to present invention rules that insure that the temporary offset is not applied until a candidate is eligible for reselection, preventing premature expiration of the timer and unintended cell reselection. A present invention mobile unit that uses the improved method includes a housing, a central processor, a timer for applying the temporary offset, and a memory. The memory includes computer code that applies the claimed invention rules for starting the timer.
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Citations
13 Claims
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1. An improved method for serving cell reselection by a mobile unit in a Hierarchical Cell Structure (HCS) wireless communications system, each cell in the HCS wireless communications system having an assigned HCS priority, the mobile unit comprising a Radio Resource Control (RRC) used to establish at least a radio bearer for receiving system information transmitted from the serving cell to the mobile unit when the mobile unit is within a service area of the serving cell, the method comprising:
if the HCS priority of the serving cell equals the HCS priority of a candidate cell and the measured signal quality of the candidate cell is greater than the sum of a measured signal quality of the serving cell plus a system information supplied offset between the serving and the candidate cell plus a system information specified hysteresis value for the serving cell, starting a timer to apply a temporary offset to signal quality measurements of the candidate cell, the adjusted signal quality measurements used for ranking that candidate cell for reselection. - View Dependent Claims (2, 3)
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4. A mobile unit for use in a Hierarchical Cell Structure (HCS) wireless communications system, each cell in the HCS wireless communications system having an assigned HCS priority, the mobile unit in radio contact with a serving cell and capable of reselecting to a candidate cell, the serving cell broadcasting system information to be used by the mobile unit in a cell reselection process, the mobile unit comprising:
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a housing;
a timer for applying a temporary offset to a signal quality measurement of the candidate cell for a predetermined time interval;
a central processing unit for executing computer code; and
a memory comprising;
computer code for determining a quality measure for cell reselection setting in the serving cell; and
improved computer code for starting a timer to apply a temporary offset to signal quality measurements of the candidate cell when the candidate cell qualifies for reselection, the adjusted signal quality measurements used for ranking that candidate cell for reselection. - View Dependent Claims (5, 6, 7)
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8. A method of ranking candidate cells during a cell reselection procedure in a Hierarchical Cell Structure (HCS) wireless communications system, each cell in the HCS wireless communications system having an assigned HCS priority, the wireless communications system comprising a mobile unit and a serving cell, the mobile unit having a Radio Resource Control (RRC) for establishing at least a radio bearer for receiving system information transmitted from the serving cell to the mobile unit when the mobile unit is within a service area of the serving cell, the method comprising:
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selecting candidate neighboring cells according to predetermined measurement rules using system information supplied thresholds;
starting a timer in the mobile unit for application of a temporary offset adjusting signal quality measurements of a candidate cell when that candidate cell qualifies for reselection; and
ranking candidate cells according to the adjusted signal quality measurements for each candidate cell. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification