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Multi-user beamforming with inter-cell interference suppression

  • US 8,369,791 B2
  • Filed: 09/22/2009
  • Issued: 02/05/2013
  • Est. Priority Date: 09/22/2009
  • Status: Active Grant
First Claim
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1. A method for determining downlink transmission parameters in a first cell of a cellular wireless network using coordinated multi-point transmission, wherein the first cell comprises a plurality of radio access points and wherein each radio access point comprises one or more transmit antennas, the method comprising, for each of two or more iterations:

  • determining, for each of a plurality of first mobile stations served by the first cell and for each of one or more second mobile stations served by one or more neighboring cells, a tentative user-specific antenna beam-forming vector for the antennas of the first cell, using a most recent tentative virtual allocation of uplink transmitter power to each of the first and second mobile stations and based on virtual uplink signal-to-noise-plus-interference ratios for the first and second mobile stations that account for inter-cell interference, wherein determining said tentative user-specific antenna beam-forming vector comprises of a non-physical modeling element used for determination of uplink transmitter power as the most recent tentative virtual allocation of uplink transmitter power;

    determining a current tentative allocation of downlink transmitter power to each of the first mobile stations based on the tentative user-specific antenna beam-forming vectors, a pre-determined transmitter power constraint for the first cell, and target signal-to-noise-plus-interference ratios for the first mobile stations; and

    determining a current tentative virtual allocation of uplink transmitter power to each of the first and second mobile stations, based on the current tentative allocation of downlink transmitter power.

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