Method and apparatus for transmitting and receiving codebook subset restriction bitmap

Patent metadata

Field	Value
Publication number	US-2016013853-A1
Application number	US-201514859940-A
Country	US
Kind code	A1
Filing date	Sep 21, 2015
Priority date	Oct 4, 2010
Publication date	Jan 14, 2016
Grant date	—

Abstract

A method for transmitting and receiving a codebook subset restriction bitmap is provided. The Codebook Subset Restriction (CSR) bitmap transmission method of an evolved Node B (eNB) in transmission mode 9 for communication with 8 antenna ports includes generating a CSR bitmap including bits corresponding to restricted precoding matrix indicators and rank indicators that are not allowed for reporting and transmitting the CSR bitmap to a User Equipment (UE). The CSR bitmap comprises 53 bits corresponding to a first codebook and 56 bits corresponding to a second codebook, the 53 bits corresponding to a first codebook comprise 16, 16, 4, 4, 4, 4, and 1 bits for layers 1, 2, 3, 4, 5, 6, 7, and 8, respectively, and the 56 bits corresponding to a second codebook comprise 16, 16, 16 and 8 bits for layers 1, 2, 3, and 4, respectively.

First claim

What is claimed is:

1 . A method in a wireless communication system, the method comprising:
transmitting a codebook subset restriction (CSR) bitmap including bits corresponding to restricted precoding matrix indicators (PMIs) that are not allowed to be reported by a terminal; and receiving a PMI which is not included in the restricted PMIs from the terminal, wherein the CSR bitmap comprises a a ƒ (1) (v)+i 1 -th bit corresponding to a first PMI i 1 and a layer v and a 53+ƒ (2) (v)+i 2 -th bit corresponding to a second PMI i 2 and a layer v, and wherein the ƒ (1) (v) and the ƒ (2) (v) are defined as the following equations, respectively:

f

(
1
)



(
v
)

=

{

0

for



v

=
1

16

for



v

=
2

32

for



v

=
3

36

for



v

=
4

40

for



v

=
5

44

for



v

=
6

48

for



v

=
7

52

for



v

=
8




and






f

(
2
)



(
v
)

=

{

0

for



v

=
1

16

for




Assignees

• Samsung Electronics Co Ltd

Inventors

• Han Jin Kyu
• Clerckx Bruno

Classifications

• H04B1/04

  Circuits · CPC title

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04B1/16

  Circuits · CPC title

• H04B7/0482

  Adaptive codebooks · CPC title