Control/pilot channel reselection between cells belonging to different registration areas
First Claim
1. A cellular telephone system including multiple registration areas, wherein each registration area comprises a plurality of cells, and each cell is assigned at least one reselection hysteresis value to be accounted for during intra-registration area mobile station server selection, and wherein cells located along a border of the registration area are assigned at least one registration hysteresis value in addition to any assigned reselection hysteresis values to be accounted for during inter-registration area mobile station server selection.
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Accused Products
Abstract
In a TDMA or CDMA cellular telephone network including a plurality of registration areas, and in instances of mobile station cell re-selection between a cell located in a first registration area and a cell located in a second registration area, the mobile station processes control or pilot channel signal strength measurements in view of both a conventional reselection hysteresis and an additional registration hysteresis. Reselection is performed by the mobile station when the control or pilot channel signal strength measured with respect to the second registration area cell exceeds the control or pilot channel signal strength measured with respect to the first registration area cell by the sum total of both the reselection hysteresis and the registration hysteresis. This makes it more difficult to obtain an inter-registration area cell reselection to the benefit of minimizing the likelihood of incurring unnecessary consumption of valuable cellular air interface and system resources due to mobile station transit back and forth between the two registration areas.
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Citations
15 Claims
- 1. A cellular telephone system including multiple registration areas, wherein each registration area comprises a plurality of cells, and each cell is assigned at least one reselection hysteresis value to be accounted for during intra-registration area mobile station server selection, and wherein cells located along a border of the registration area are assigned at least one registration hysteresis value in addition to any assigned reselection hysteresis values to be accounted for during inter-registration area mobile station server selection.
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7. In a cellular telephone system including a plurality of registration areas each including a plurality of cells, wherein each cell has an assigned reselection hysteresis value, and certain cells have an additional assigned registration hysteresis value to be accounted for during inter-registration area cell selection, a method for cell reselection between cells located in different registration areas comprising the steps of:
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making signal strength measurements on both a currently serving cell in one registration area and a target certain cell in another registration area; comparing the measured signal strengths with respect to the currently serving cell and target certain cell; and reselecting the target certain cell over the currently serving cell if the measured signal strength for the target certain cell exceeds the measured signal strength for the currently serving cell by at least the sum of the reselection and registration hysteresis values of the target certain cell. - View Dependent Claims (8, 9, 10)
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11. A cellular telephone system including multiple registration areas, comprising:
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a plurality of cells each having an assigned reselection hysteresis value, the cells including certain cells having an additional assigned registration hysteresis value; and a mobile station moving through the cells and engaging in server selections thereof by making signal strength measurements with respect to both a currently serving cell in one registration area and a target certain cell in another registration area, the mobile station reselecting the target certain cell over the currently serving cell if the measured signal strength for the target certain cell exceeds the measured signal strength for the currently serving cell by at least the sum of the reselection and registration hysteresis values of the target certain cell. - View Dependent Claims (12, 13, 14, 15)
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Specification