DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK
First Claim
1. A method of coordinating multipoint transmissions in a mobile communication network having coordinated multipoint cells that overlap, said method comprising:
- computing tentative precoding weights for a coordinated multipoint transmission from a plurality of transmit antennas in two or more coordinating cells of a coordinated multipoint cell to one or more mobile terminals in a serving cell of the coordinated multipoint cell, at least one of said transmit antennas being shared with an overlapping coordinated multipoint cell;
determining a power availability for said shared transmit antennas in said coordinated multipoint cell; and
scaling the tentative precoding weights based on the power availability of said shared transmit antennas to determine final precoding weights for said coordinated multipoint transmission.
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Accused Products
Abstract
In a Coordinated Multi-point (CoMP) system, the base station (BS) in each serving cell (or sector) is allowed to use not only its own antennas, but also the antennas of neighboring BSs to transmit to mobile terminals in the serving cell to form a floating CoMP cell. The serving BS in each floating CoMP cell computes tentative linear precoding weights for transmissions from the coordinating BSs in the floating CoMP cell to users in the serving cell of the floating CoMP cell. The serving BS determines the power availability for transmit antennas in the floating CoMP cell that are shared with other floating CoMP cells, and scales the tentative precoding weights based on the power availability of the shared transmit antennas to determine final precoding weights so that the power constraints of the shared transmit antennas will not be violated.
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Citations
16 Claims
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1. A method of coordinating multipoint transmissions in a mobile communication network having coordinated multipoint cells that overlap, said method comprising:
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computing tentative precoding weights for a coordinated multipoint transmission from a plurality of transmit antennas in two or more coordinating cells of a coordinated multipoint cell to one or more mobile terminals in a serving cell of the coordinated multipoint cell, at least one of said transmit antennas being shared with an overlapping coordinated multipoint cell; determining a power availability for said shared transmit antennas in said coordinated multipoint cell; and scaling the tentative precoding weights based on the power availability of said shared transmit antennas to determine final precoding weights for said coordinated multipoint transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A serving base station for coordinating transmissions from a plurality of coordinating cells in a coordinated multipoint cell, said serving base station comprising a transmit signal processor configured to:
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compute tentative precoding weights for a coordinated multipoint transmission from a plurality of transmit antennas in two or more coordinating cells of said coordinated multipoint cell to one or more mobile terminals in a serving cell of the coordinated multipoint cell, at least one of said transmit antennas being shared with an overlapping coordinated multipoint cell; determine a power availability for said shared transmit antennas in said coordinated multipoint cell; and scale the tentative precoding weights based on the power availability of said shared transmit antennas to determine final precoding weights for said coordinated multipoint transmission. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of coordinating multipoint transmissions in a mobile communication network having coordinated multipoint cells that overlap, said method comprising:
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receiving, from serving cells in two or more coordinated multipoint cells, transmit power requirements for one or more transmit antennas shared by said two or more coordinated multipoint cells; determining power availability for each shared transmit antenna based on said received transmit power requirements; and reporting said power availability for each shared antenna to said serving cells. - View Dependent Claims (14)
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15. A base station in a coordinating cell of two or more coordinated multipoint cells, said base station comprising a transmit signal processor configured to:
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receive, from serving cells in two or more coordinated multipoint cells, transmit power requirements for one or more transmit antennas shared by said two or more coordinated multipoint cells; determine power availability for each shared transmit antenna based on said received transmit power requirements; and report said power availability for each shared antenna to said serving cells. - View Dependent Claims (16)
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Specification