Adaptive channel allocation in a mobile communications system
First Claim
1. In a cellular communication system comprising first and second cells, wherein the first cell comprises a first base station and a first mobile station, and the second cell comprises a second base station and a second mobile station, and wherein further the second cell uses any one of a plurality of channels on a second connection between the second base station and a second mobile station, a method for allocating one of the plurality of channels for use on a first connection between the first base station and the first mobile station, the method comprising the steps of:
- in the second cell, adjusting total power of the used one of the channels by an amount .increment.P2, wherein;
.increment.P2 is equal to a sum of a change in transmission power of the second mobile station plus a change in transmission power of the second base station on the used one of the channels;
.increment.P2 has a magnitude that is substantially equal to a magnitude of a change in path gain between the second mobile station and the second base station; and
.increment.P2 has a sign that is opposite a sign of the change in path gain between the second mobile station and the second base station;
in the first cell, using determinations of uplink interference values to select an acceptable free channel from those ones of the plurality of channels that are unused in the first cell; and
in the first cell, allocating the acceptable free channel to the first connection.
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Accused Products
Abstract
In a cellular communication system, a method and apparatus are provided for allocating a channel for use on a connection between a base station and a mobile station in a cell, without making measurements of downlink interference. Throughout the system, uplink and downlink power levels are regulated so that, within each cell, their sum changes by an amount whose magnitude is substantially equal to the magnitude of change in path gain between the mobile station and the base station in that cell, and which sum is opposite in sign to the amount of change in path gain. This power regulation scheme assures that there will be a strong correlation between system-wide measurements of uplink and downlink interference. Therefore, with the power regulation scheme in place, each cell determines uplink carrier to interference (C/I) ratios for the free channels available for use in the cell and selects an acceptable free channel having a C/I value that is within a predetermined acceptable range. If uplink C/I on the acceptable free channel is greater than the uplink C/I value of a channel currently assigned to a connection, then an intra-cell handover is performed so that the connection will be reassigned to the acceptable free channel. This technique is useful for providing an adaptive channel allocation scheme to systems, such as analog cellular communications systems, in which downlink interference measurements cannot be made.
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Citations
12 Claims
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1. In a cellular communication system comprising first and second cells, wherein the first cell comprises a first base station and a first mobile station, and the second cell comprises a second base station and a second mobile station, and wherein further the second cell uses any one of a plurality of channels on a second connection between the second base station and a second mobile station, a method for allocating one of the plurality of channels for use on a first connection between the first base station and the first mobile station, the method comprising the steps of:
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in the second cell, adjusting total power of the used one of the channels by an amount .increment.P2, wherein; .increment.P2 is equal to a sum of a change in transmission power of the second mobile station plus a change in transmission power of the second base station on the used one of the channels; .increment.P2 has a magnitude that is substantially equal to a magnitude of a change in path gain between the second mobile station and the second base station; and .increment.P2 has a sign that is opposite a sign of the change in path gain between the second mobile station and the second base station; in the first cell, using determinations of uplink interference values to select an acceptable free channel from those ones of the plurality of channels that are unused in the first cell; and in the first cell, allocating the acceptable free channel to the first connection. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a cellular communication system comprising first and second cells, wherein the first cell comprises a first base station and a first mobile station, and the second cell comprises a second base station and a second mobile station, and wherein further the second cell uses any one of a plurality of channels on a second connection between the second base station and a second mobile station, an apparatus for allocating one of the plurality of channels for use on a first connection between the first base station and the first mobile station, the apparatus comprising:
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means for adjusting total power of the used one of the channels in the second cell by an amount .increment.P2, wherein; .increment.P2 is equal to a sum of a change in transmission power of the second mobile station plus a change in transmission power of the second base station on the used one of the channels; .increment.P2 has a magnitude that is substantially equal to a magnitude of a change in path gain between the second mobile station and the second base station; and .increment.P2 has a sign that is opposite a sign of the change in path gain between the second mobile station and the second base station; means for using determinations of uplink interference values collected in the first cell to select an acceptable free channel from those ones of the plurality of channels that are unused in the first cell; and means for allocating the acceptable free channel to the first connection in the first cell. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification