Multi-user beamforming with inter-cell interference suppression
First Claim
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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Accused Products
Abstract
Techniques for determining interference-suppressing downlink transmission parameters in a wireless network using coordinated multi-point (CoMP) transmission are disclosed. In each of several iterations of an exemplary method, a tentative user-specific antenna beam-forming vector for the antennas of the first cell is formed for each of several first mobile stations served by the cell and for each of several second mobiles in neighboring cells, based on a most recent tentative virtual allocation of uplink transmitter power to each of the mobile stations and virtual uplink signal-to-noise-plus-interference ratios for the mobile stations that account for inter-cell interference. Further, a current tentative allocation of downlink transmitter power to each of the first mobile stations is determined for each iteration, based on the tentative user-specific antenna beam-forming vectors for the first cell, a pre-determined transmitter power constraint for the first cell, and target signal-to-noise-plus-interference ratios for the first mobile stations.
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Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A controller for 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 controller comprising an interface circuit communicatively connecting the controller to the plurality of radio access points and one or more processing circuits configured to, for each of two or more iterations:
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determine, 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, based on a most recent tentative virtual allocation of uplink transmitter power to each of the first and second mobile stations and 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; determine 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 determine 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification