Advanced feedback and reference signal transmissions for mimo wireless communication systems

Patent metadata

Field	Value
Publication number	US-2016269084-A1
Application number	US-201615068489-A
Country	US
Kind code	A1
Filing date	Apr 12, 2016
Priority date	Mar 13, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A user equipment (UE) capable of communicating with a base station includes a transceiver configured to receive a signal comprising a CSI process configuration, wherein the CSI process configuration comprises a plurality of CSI-RS resource configurations to identify CSI-RS resources, and a controller configured to derive a first PMI index, i 11 utilizing a first non-precoded CSI-RS on a first non-precoded CSI-RS resource, derive a second PMI index, i 12 utilizing a second non-precoded CSI-RS on a second non-precoded CSI-RS resource, derive a third PMI index, i 2 utilizing a beamformed CSI-RS on a beamformed CSI-RS resource, and cause the transceiver to transmit a CSI feedback comprising the three PMI indices i 11 , i 12 and i 2 to the base station. A base station capable of communicating with UE a transmitter configured to transmit a signal comprising a CSI process configuration, wherein the CSI process configuration comprises a plurality of CSI-RS resource configurations.

First claim

What is claimed:

1 . A user equipment (UE) capable of communicating with a base station (B S), the UE comprising:
a transceiver configured to:
receive a signal comprising a CSI process configuration, wherein the CSI process configuration comprises a plurality of CSI-RS resource configurations to identify CSI-RS resources; and
a controller configured to:
derive a first PMI index, i 11 utilizing a first non-precoded CSI-RS on a first non-precoded CSI-RS resource;
derive a second PMI index, i 12 utilizing a second non-precoded CSI-RS on a second non-precoded CSI-RS resource;
derive a third PMI index, i 2 utilizing a beamformed CSI-RS on a beamformed CSI-RS resource; and
cause the transceiver to transmit a CSI feedback comprising the three PMI indices i 11 , i 12 and i 2 to the base station.

2 . The UE of claim 1 , wherein the plurality of CSI-RS resource configuration comprise at least one of a CSI-RS transmission period and offset, a parameter Pc, CSI-RS RE mapping pattern indicator, or a number of antenna ports.

3 . The UE of claim 1 , wherein the UE is configured to use an N 1 -port PMI codebook and an N 2 -port PMI codebook respectively to derive i 11 and i 12 .

4 . The UE of claim 3 , wherein the UE is configured with N 1 and N 2 in a higher layer, wherein N 1 and N 2 respectively represent a number of the first non-precoded CSI-RS ports and a number of the second non-precoded CSI-RS ports.

5 . The UE of claim 3 , wherein the UE is configured with 2N 1 and 2N 2 in a higher layer, wherein 2N 1 and 2N 2 respectively represent a number of the first non-precoded CSI-RS ports and a number of the second non-precoded CSI-RS ports.

6 . The UE of claim 3 , wherein a N 1 -port PMI precoder, w 1 , comprising the N 1 -port PMI codebook and a N 2 -port PMI precoder u m , comprising the N 2 -port PMI codebook, are represented as follows:

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Assignees

• Samsung Electronics Co Ltd

Inventors

• Nam Young-Han
• Rahman Md Saifur
• Kim Taeyoung
• Onggosanusi Eko
• Noh Jeehwan

Classifications

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04W72/0413

  Electricity · mapped topic

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title