Method and system for computing the optimal slot to cell assignment in cellular systems employing time division duplex
First Claim
1. A base station for optimizing allocation of time slots in a time-slotted wireless communication system in which a region covered by the system is divided into a plurality of cells, and each cell is served by a base station, the base station comprising:
- means for setting a maximum number of crossed time slots between adjacent cells, a crossed time slot comprising a time slot that is allocated as an uplink time slot in one cell and as a downlink time slot in an adjacent cell; and
means for allocating each time slot as either an uplink time slot or a downlink time slot, such that the number of crossed time slots between adjacent cells does not exceed said maximum number.
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Abstract
A system and method to optimize the number of uplink and downlink slots, given the maximum number of crossed slots between any two cells is disclosed. The present invention effectively assigns a direction (i.e. uplink or downlink) to every slot in every cell of the system, taking into account the trade-off between: a) avoiding base-to-base or mobile-to-mobile interference; and b) matching the slot assignment of every cell as closely as possible to the local traffic conditions. The present invention assigns users to slots according to their transmission power requirements in order to allow conflicting slot-to-cell assignments between two cells in the same geographic region.
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Citations
12 Claims
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1. A base station for optimizing allocation of time slots in a time-slotted wireless communication system in which a region covered by the system is divided into a plurality of cells, and each cell is served by a base station, the base station comprising:
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means for setting a maximum number of crossed time slots between adjacent cells, a crossed time slot comprising a time slot that is allocated as an uplink time slot in one cell and as a downlink time slot in an adjacent cell; and
means for allocating each time slot as either an uplink time slot or a downlink time slot, such that the number of crossed time slots between adjacent cells does not exceed said maximum number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for optimizing allocation of time slots in a time-slotted wireless communication system in which a region covered by the system is divided into a plurality of cells, and each cell is served by a base station, the method comprising:
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setting a maximum number of crossed time slots between adjacent cells, a crossed time slot comprising a time slot that is allocated as an uplink time slot in one cell and as a downlink time slot in an adjacent cell; and
allocating each time slot as either an uplink time slot or as a downlink time slot, wherein the number of crossed time slots between adjacent cells does not exceed said maximum number. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification