Method and system for computing the optimal slot to cell assignment in cellular systems employing time division duplex
AssigneeInterDigital Technology Corporation
InventorPaul Marinier
Life of this patent
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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.
Claims6
In a wireless communication system, a method for optimizing allocation of timeslots among a plurality of cells, wherein the timeslots are organized into a plurality of frames, the method comprising the steps of:
- (a) determining a minimum and a maximum number of uplink timeslots available for traffic in each of the plurality of cells;
- (b) determining a minimum and a maximum number of downlink timeslots available for traffic in each of the plurality of cells;
- (c) for every pair of cells in the plurality of cells, specifying a maximum number of crossed timeslots to be tolerated by the wireless communication system, wherein a crossed timeslot is a timeslot that is used for downlink transmissions in a first cell and also for uplink transmissions in a second cell;
- (d) determining a cost function for a timeslot assignment for each of the plurality of cells;
- and
- (e) determining a number of uplink timeslots and a number of downlink timeslots to assign to each of the plurality of cells by minimizing the sum of the cost functions across the plurality of cells.
Dependencies are inferred from the claim text.