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US 9,438,325 B2Granted
Method for signaling MU-MIMO parameters
AssigneeInterDigital Patent Holdings, Inc.
InventorsKyle Jung-Lin Pan, Guodong Zhang, Donald M. Grieco, Phillip J. Pietraski
Life of this patent
Estimating the term…
Abstract
Methods for signaling multi-user multiple-input multiple output (MU-MIMO) parameters for Evolved-UTRA (E-UTRA) are disclosed. Example signaling format methods are presented that allow use of distributed virtual resource blocks (DVRB) or support of four wireless transmit/receive units (WTRUs) but maintaining a predetermined signal format size. A signaling format is also presented that signals transmission precoding matrix indexes used by all co-scheduled WTRUs.
Claims16
A method for signaling multi-user multiple-input multiple-output (MU-MIMO) transmission parameters, the method comprising:
- receiving a first downlink control information message with a distributed virtual resource block (DVRB) flag, a power share bit, and transmission precoding matrix index (TPMI) bits conveying a first set of transmission parameters on a condition of a two transmitting antenna configuration, wherein the TPMI bits are configured to indicate TPMIs of wireless transmit receive units (WTRUs) co-scheduled using the two transmitting antenna configuration;
- processing the first downlink control information message and applying the first set of transmission parameters to perform MU-MIMO reception in accordance with the two transmitting antenna configuration;
- receiving a second downlink control information message with a DVRB flag and additional TPMI bits conveying a second set of transmission parameters on a condition of a four transmitting antenna configuration, wherein the additional TPMI bits for the four transmitting antenna configuration comprise more TPMI bits than are used for the two transmitting antenna configuration, wherein the additional TPMI bits are configured to indicate TPMIs of WTRUs scheduled using the four transmitting antenna configuration, and wherein power sharing for the four transmitting antenna configuration is configured to be obtained from the additional TPMI bits;
- and
- processing the second downlink control information message and applying the second set of transmission parameters to perform MU-MIMO reception for the four transmitting antenna configuration.
2 more elements
A method for signaling multi-user multiple-input multiple-output (MU-MIMO) transmission parameters, the method comprising:
- receiving a first downlink control information message with transmission precoding matrix index (TPMI) bits and a power share bit conveying a first set of transmission parameters on a condition of a two transmitting antenna configuration, wherein the TPMI bits are configured to indicate TPMIs of wireless transmit receive units (WTRUs) co-scheduled using the two transmitting antenna configuration;
- processing the first downlink control information message and applying the first set of transmission parameters to perform MU-MIMO reception in accordance with the two transmitting antenna configuration;
- receiving a second downlink control information message with additional TPMI bits conveying a second set of transmission parameters on a condition of a four transmitting antenna configuration, wherein the additional TPMI bits for the four transmitting antenna configuration comprise more TPMI bits than are used for the two transmitting antenna configuration, wherein the additional TPMI bits are configured to indicate TPMIs of WTRUs scheduled using the four transmitting antenna configuration, and wherein power sharing for the four transmitting antenna configuration is configured to be obtained from the additional TPMI bits;
- and
- processing the second downlink control information message and applying the second set of transmission parameters to perform MU-MIMO reception for the four transmitting antenna configuration.
2 more elements
A wireless transmit/receive unit for receiving multi-user multiple-input multiple-output (MU-MIMO) transmission parameters, comprising:
- a receiver configured to receive a first downlink control information message with a distributed virtual resource block (DVRB) flag, a power share bit, and transmission precoding matrix index (TPMI) bits conveying a first set of transmission parameters on a condition of a two transmitting antenna configuration,
- a processor configured to process the first downlink control information message and applying the first set of transmission parameters to perform MU-MIMO reception in accordance with the two transmitting antenna configuration,
- the receiver configured to receive a second downlink control information message with a DVRB flag and additional TPMI bits conveying a second set of transmission parameters on a condition of a four transmitting antenna configuration, wherein the TPMI bits are configured to indicate TPMIs of wireless transmit receive units (WTRUs) co-scheduled using the two transmitting antenna configuration, wherein the additional TPMI bits for the four transmitting antenna configuration comprise more TPMI bits than are used for the two transmitting antenna configuration, wherein the additional TPMI bits are configured to indicate TPMIs of WTRUs scheduled using the four transmitting antenna configuration, and wherein power sharing for the four transmitting antenna configuration is configured to be obtained from the additional TPMI bits;
- and
- the processor configured to process the second downlink control information message and apply the second set of transmission parameters to perform MU-MIMO reception for the four transmitting antenna configuration.
2 more elements
Dependencies are inferred from the claim text.