Facilitating interference management in multi-cell and multi-user millimeter wave cellular networks
First Claim
1. A method, comprising:
- receiving, by a base station device comprising a processor and associated with a cell, pilot signals transmitted from a mobile device using different precoders at different training slots in the cell associated with the base station device;
notifying, by the base station device, a mobile device of an index of a selected precoder of the different precoders used by the mobile device and that satisfies a defined condition;
transmitting, by the base station device, pilot signals to the mobile device, wherein the transmitting is performed using the different precoders at the different training slots;
collecting, by the base station device, feedback information from the mobile device, wherein the feedback information comprises;
a first information set determined based on received powers detected at the mobile device and associated with the base station device at the different training slots; and
a second information set determined based on interference powers detected at the mobile device from unassociated base station devices at the different training slots, wherein the unassociated base station devices are ones of the base station devices associated with different cells from the cell associated with the base station device, and wherein the unassociated base station devices and the base station device are included in a network;
sharing, by the base station device, the second information set between other ones of the base station devices in the network to facilitate interference management;
partitioning, by the base station device, the first information set into a first group in which a beam does not cause interference to other mobile devices and a second group in which the beam does cause interference to the other ones of the mobile devices, wherein the partitioning is based on third information received from the other base station devices;
determining, by the base station device, a first selected beam in the first group and determining a second selected beam in the second group; and
selecting, by the base station device, based on a criterion, the first selected beam in the first group or the second selected beam in the second group as a beam for the base station device to transmit a signal, wherein the selecting the first selected beam or the second selected beam comprises;
selecting the second selected beam in the second group as the beam for the base station device to transmit the signal based on a determination that the first group includes no beams and the second group includes beams; and
selecting the first selected beam in the first group as the beam for base station device to transmit the signal based on a determination that the second group includes no beams and the first group includes beams.
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Abstract
Interference management methods are proposed to facilitate multi-cell, multi-user millimeter wave cellular networks. One method includes a feedback approach in which a base station (BS) device collects information from mobile devices in the cell operated by the BS device and other BS devices in other cells. Each mobile device feeds back a best beams set and a worst interference beams set to its serving BS device and the information is shared amongst other BS devices in the network. According to the information, BS devices implement a beam selection criterion to select a beam for downlink transmission. To reduce feedback cost, another method leverages the channel reciprocity in time division duplexing to use the measured uplink power and interference information to select the narrow beam for downlink transmission. The BS device selects the narrow beam that establishes a reliable channel and reduces interference to mobile devices in neighboring cells.
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Citations
31 Claims
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1. A method, comprising:
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receiving, by a base station device comprising a processor and associated with a cell, pilot signals transmitted from a mobile device using different precoders at different training slots in the cell associated with the base station device; notifying, by the base station device, a mobile device of an index of a selected precoder of the different precoders used by the mobile device and that satisfies a defined condition; transmitting, by the base station device, pilot signals to the mobile device, wherein the transmitting is performed using the different precoders at the different training slots; collecting, by the base station device, feedback information from the mobile device, wherein the feedback information comprises; a first information set determined based on received powers detected at the mobile device and associated with the base station device at the different training slots; and a second information set determined based on interference powers detected at the mobile device from unassociated base station devices at the different training slots, wherein the unassociated base station devices are ones of the base station devices associated with different cells from the cell associated with the base station device, and wherein the unassociated base station devices and the base station device are included in a network; sharing, by the base station device, the second information set between other ones of the base station devices in the network to facilitate interference management; partitioning, by the base station device, the first information set into a first group in which a beam does not cause interference to other mobile devices and a second group in which the beam does cause interference to the other ones of the mobile devices, wherein the partitioning is based on third information received from the other base station devices; determining, by the base station device, a first selected beam in the first group and determining a second selected beam in the second group; and selecting, by the base station device, based on a criterion, the first selected beam in the first group or the second selected beam in the second group as a beam for the base station device to transmit a signal, wherein the selecting the first selected beam or the second selected beam comprises; selecting the second selected beam in the second group as the beam for the base station device to transmit the signal based on a determination that the first group includes no beams and the second group includes beams; and selecting the first selected beam in the first group as the beam for base station device to transmit the signal based on a determination that the second group includes no beams and the first group includes beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 31)
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12. A non-transitory computer-readable medium storing computer-executable instructions that, in response to execution, cause a processor of a base station device associated with a cell to perform operations, comprising:
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receiving pilot signals transmitted from a mobile device using different precoders at different training slots in the cell associated with the base station device; notifying a mobile device of an index of a selected precoder of the different precoders used by the mobile device and that satisfies a defined condition; transmitting pilot signals to the mobile device, wherein the transmitting is performed using the different precoders at the different training slots; collecting feedback information from the mobile device, wherein the feedback information comprises; a first information set determined based on received powers detected at the mobile device and associated with the base station device at the different training slots; and a second information set determined based on interference powers detected at the mobile device from unassociated base station devices at the different training slots, wherein the unassociated base station devices are ones of the base station devices associated with different cells from the cell associated with the base station device, and wherein the unassociated base station devices and the base station device are included in a network; sharing the second information set between other ones of the base station devices in the network to facilitate interference management; partitioning the first information set into a first group in which a beam does not cause interference to other mobile devices and a second group in which the beam causes interference to the other ones of the mobile devices, wherein the partitioning is based on third information shared by the other base station devices; determining a first selected beam in the first group and determining a second selected beam in the second group; and selecting based on a criterion, the first selected beam in the first group or the second selected beam in the second group as a beam for the base station device to transmit a signal, wherein the selecting the first selected beam or the second selected beam comprises; selecting the second selected beam in the second group as the beam for the base station device to transmit the signal based on a determination that the first group includes no beams and the second group includes beams; and selecting the first selected beam in the first group as the beam for base station device to transmit the signal based on a determination that the second group includes no beams and the first group includes beams. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method, comprising:
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notifying, by a base station device comprising a processor and associated with a cell, a mobile device, of an index of a selected precoder of different precoders at different training slots in the cell associated with the base station device used by the mobile device and that satisfies a defined condition; transmitting, by the base station device, pilot signals to the mobile device, wherein the transmitting is performed using the different precoders at the different training slots; determining, by the base station device, a first selected beam in the first group and determining a second selected beam in the second group; and selecting, by the base station device, based on a criterion, the first selected beam in the first group or the second selected beam in the second group as a beam for the base station device to transmit a signal, wherein the selecting the first selected beam or the second selected beam comprises; selecting the second selected beam in the second group as the beam for the base station device to transmit the signal based on a determination that the first group includes no beams and the second group includes beams; and selecting the first selected beam in the first group as the beam for base station device to transmit the signal based on a determination that the second group includes no beams and the first group includes beams. - View Dependent Claims (27, 28, 29, 30)
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Specification