Codebook design and structure for advanced wireless communication systems

Patent metadata

Field	Value
Publication number	US-2016119097-A1
Application number	US-201514874252-A
Country	US
Kind code	A1
Filing date	Oct 2, 2015
Priority date	Oct 3, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

A base station capable of communicating with a user equipment (UE) includes a transceiver configured to transmit Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a number of antenna ports, and downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second sampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 , receive, from the UE, uplink signals containing a precoding matrix indicator (PMI) derived using the CSI-RS according to the precoding-matrix-construction configuration, a controller configured to convert the PMI to one of predetermined precoding matrices. Other embodiments including UEs and methods are disclosed.

First claim

What is claimed:

1 . A base station capable of communicating with a user equipment (UE), the base station comprising:
a transceiver configured to:
transmit
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ;

receive, from the UE, uplink signals containing a plurality of precoding matrix indicators (PMIs) derived using the CSI-RS according to the precoding-matrix-construction configuration;
a controller configured to convert the number of PMIs to one of predetermined precoding matrices having a form of

[

h
⊗
v



j



ϕ



h
⊗
v

]

,

wherein φ is a co-phasing factor, and h and v are vectors of size N 1 ×1 and N 2 ×1, respectively.

2 . The base station of claim 1 , wherein when N 1 =4 and N 2 =2, h and v are
h=[ 1 e j2πm 1 /D 1 e j4πm 1 /D 1 e j6πm 1 /D1 ] t , v=[ 1 e j2πm 2 /D 2 ] t , where D 1 =O 1 ·N 1 , and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.

3 . The base station of claim 1 , wherein the number of the plurality of antenna ports is equal to 2·N 1 ·N 2 .

4 . The base station of claim 1 , wherein the uplink signals further comprises Channel quality indicator (CQI) derived utilizing the one of predetermined precoding matrices.

5 . The base station of claim 1 , wherein the plurality of PMIs comprise at least two indicators respectively for h and v .

6 . The base station of claim 2 , wherein the plurality of PMIs are used to determine m 1 and m 2 .

7 . A method for a base station (BS), the method comprising:
transmitting
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ;
receiving, from the UE, uplink signals containing a plurality of precoding matrix indicators (PMIs) derived using the CSI-RS according to the precoding-matrix-construction configuration; converting the number of PMIs to one of predetermined precoding matrices having a form of

[

h
⊗
v



j



ϕ



h
⊗
v

]

,

wherein φis a co-phasing factor, and h and v are vectors of size N 1 ×1 and N 2 ×1, respectively.

8 . The method of claim 7 , wherein when N 1 =4 and N 2 =2, h and v are
h=[ 1 e j2πm 1 /D 1 e j4πm 1 D 1 e j6πm 1 D 1 ] t , v=[ 1 e j2πm 2 /D 2 ] t , where D 1 =O 1 ·N 1 ,and D 2 =O 2 ·N 2 , and m 1 and m 2 are a positive integer.

9 . The method of claim 7 , wherein the number of the plurality of antenna ports is equal to 2·N 1 ·N 2 .

10 . The method of claim 7 , wherein the uplink signals comprises Channel quality indicator (CQI) derived utilizing the one of predetermined precoding matrices.

11 . The method of claim 7 , wherein the plurality of PMIs comprise at least two indicators respectively for h and v.

12 . The method of claim 7 , wherein the plurality of PMIs are used to determine m 1 and m 2 .

13 . A User Equipment (UE) capable of communicating with a base station (BS), the UE comprising:
a transceiver configured to: receive
Channel State Information-Reference Signal (CSI-RS) according to a CSI-RS configuration comprising a plurality of antenna ports; and
downlink signals containing the CSI-RS configuration and a precoding-matrix-construction configuration for precoding matrix indicator (PMI) reporting on physical downlink shared channels (PDSCH), the precoding-matrix-construction configuration comprising a first and second oversampling factors, O 1 and O 2 , and a first and second numbers, N 1 and N 2 ;
a controller configured to:
demodulate and decode the downlink signals to obtain higher-layer configured values for the O 1 and O 2 , and the N 1 and N 2 ;
determine a plurality of precoding matrix indicators (PMIs) derived using the CSI-RS according to the precoding-matrix-construction configuration; and
cause the transceiver to transmit, to the BS, uplink signals containing the plurality of PMI,
wherein the plurality of PMIs correspond to one of predetermined precoding matrices having a form of

[

h
⊗
v



j



ϕ

Assignees

• Samsung Electronics Co Ltd

Inventors

• Nam Young-Han
• Li Yang
• Onggosanusi Eko
• Rahman Md Saifur
• Kim Taeyoung

Classifications

• H04B7/0481

  using subset selection of codebooks · CPC title

• H04W88/02

  Terminal devices · 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

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title