Systems And Methods For HSDPA Multi-User MIMO Operation
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Abstract
Methods and systems for enabling MU-MIMO functions on a UE are disclosed. A precoder codebook with precoding matrices can be generated to assist in improving system throughput. Existing specifications designed for two bit precoding information can be used to communicate higher numbers of bits of precoding information by reinterpreting fields described by such specifications. Channel state information can be provided to a base station using several disclosed feedback mechanisms. A UE can determine a current MIMO transmission mode using various implicit and explicit dynamic signaling mechanisms or semi-dynamic signaling where MIMO mode data is received from a higher layer.
31 Citations
38 Claims
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1-20. -20. (canceled)
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21. A method of providing feedback from a wireless transmit and receive unit (WTRU) to a network device, the method comprising:
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operating in multi-user multiple input and multiple output (MU-MIMO) mode; determining a single user multiple input and multiple output (SU-MIMO) channel quality indicator (CQI) and precoding control information (PCI); determining an MU-MIMO CQI and PCI based on an assumption that an interfering stream is transmitted using a precoding weight; and transmitting the SU-MIMO CQI and PCI and the MU-MIMO CQI and PCI on a high speed dedicated physical control channel (HS-DPCCH). - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A wireless transmit and receive unit (WTRU) configured to transmit feedback to a network device, comprising:
a processor configured to; operate the WTRU in multi-user multiple input and multiple output (MU-MIMO) mode; determine a single-user multiple input and multiple output)(SU-MIMO channel quality indicator (CQI) and precoding control information (PCI); determine an MU-MIMO CQI and PCI based on an assumption that an interfering stream is transmitted using a precoding weight; and send the SU-MIMO CQI and PCI and the MU-MIMO CQI and PCI for transmission on a high speed dedicated physical control channel (HS-DPCCH). - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
Specification