Enhancement of download multi-user multiple-input multiple-output wireless communications
AssigneeNEC Laboratories America, Inc.
InventorsNarayan Prasad, Guosen Yue, Meilong Jiang, Mohammad A. Khojastepour, Sampath Rangarajan
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Abstract
A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system is disclosed. In an aspect, the user equipment transmits to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule and a second CSI report determined according to an MU-MIMO rule.
Claims16
A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system, the method comprising:
- transmitting to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule;
- transmitting to the base station a second CSI report determined according to an MU-MIMO rule;
- assuming a particular number of columns in U 1;
- and
- assuming either a substantially equal power per scheduled stream or a non-uniform power allocation in which a first fraction of energy per resource element (EPRE) is shared substantially equally among one or more columns of U 1 with a second fraction of the EPRE being shared substantially equally among one or more columns in U1, where U1 and U 1 represent precoding matrices used by the base station to transmit data to the user equipment and a co-scheduled user equipment, respectively.
A method implemented in a base station configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system, the method comprising:
- receiving from a user equipment a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule;
- and
- receiving from the user equipment a second CSI report determined according to an MU-MIMO rule,
- wherein the user equipment assumes a particular number of columns in U 1, and assumes either a substantially equal power per scheduled stream or a non-uniform power allocation in which a first fraction of energy per resource element (EPRE) is shared substantially equally among one or more columns of U 1 with a second fraction of the EPRE being shared substantially equally among one or more columns in U1, where U1 and U 1 represent precoding matrices used by the base station to transmit data to the user equipment and a co-scheduled user equipment, respectively.
A multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system, comprising:
- a base station;
- and
- a user equipment,
- wherein the user equipment transmits to the base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule, and a second CSI report determined according to an MU-MIMO rule, and
- wherein the user equipment assumes a particular number of columns in U 1, and assumes either a substantially equal power per scheduled stream or a non-uniform power allocation in which a first fraction of energy per resource element (EPRE) is shared substantially equally among one or more columns of U 1 with a second fraction of the EPRE being shared substantially equally among one or more columns in U1, where U1 and U 1 represent precoding matrices used by the base station to transmit data to the user equipment and a co-scheduled user equipment, respectively.
Dependencies are inferred from the claim text.