US 7,894,330 B2Granted

Method for mapping physical hybrid automatic repeat request indicator channel

AssigneeLG Electronics Inc.

InventorsJung Hoon Lee, Joon Kui Ahn

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Abstract

A method for mapping a physical hybrid automatic repeat request indicator channel (PHICH) is described. The method for mapping a PHICH includes determining an index of a resource element group transmitting a repetitive pattern of the PHICH, according to a ratio of the number of available resource element groups in a symbol in which the PHICH is transmitted and the number of available resource element groups in a first or second OFDM symbol, and mapping the PHICH to the symbol according to the determined index. In transmitting the PHICH, since efficient mapping is performed considering available resource elements varying with OFDM symbols, repetition of the PHICH does not generate interference between neighbor cell IDs and performance is improved.

Claims18

Dependent claims

A method for mapping a physical hybrid automatic repeat request indicator channel (PHICH) to orthogonal frequency division multiplexing (OFDM) symbols using resource elements as units, the method comprising:

determining indexes of resource element groups (REGs) in which repetitive patterns of the PHICH are transmitted;
and
mapping the PHICH to the OFDM symbols according to the determined indexes,
wherein an index ( ni) of the REG in an OFDM symbol of index l′i is determined by using one of the following equation 1 or 2:
n
_
i
=
{
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
0
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
+
⌊
n
l
i
′
′
/
3
⌋
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
1
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
+
⌊
2
⁢
⁢
n
l
i
′
′
/
3
⌋
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
2
equation
⁢
⁢
1
where NIDcell denotes a cell ID, n′l′i denotes the number of available resource element groups in the OFDM symbol of index l′i, n′0 denotes the number of available resource element groups in an OFDM symbol of index 0, and m′ denotes an index of a PHICH group,
n
_
i
=
{
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
0
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
+
⌊
n
l
i
′
′
/
3
⌋
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
1
⁢
(
⌊
(
N
ID
cell
·
n
l
i
′
′
/
n
0
′
)
⌋
+
m
′
+
⌊
2
⁢
⁢
n
l
i
′
′
/
3
⌋
)
⁢
mod
⁢
⁢
n
l
i
′
′
i
=
2
equation
⁢
⁢
2
where NIDcell denotes a cell ID, n′l′i denotes the number of available resource element groups in the OFDM symbol of index l′i, n′1 denotes the number of available resource element groups in an OFDM symbol of index 1, and m′ denotes an index of a PHICH group.

277 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/388,243Filed 18 Feb 2009 · us provisional application
Priority: KR 10-2008-01240848 Dec 2008
Published: US 2009/0274037 A15 Nov 2009
Granted: 22 Feb 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H04L 1/1861
Arrangements specially adapted for the receiver end: physical mapping arrangements
H04L 1/1812
Automatic repetition systems, e.g. Van Duuren systems: hybrid protocols; Hybrid automatic repeat request [HARQ]
H04L 1/1854
Arrangements specially adapted for the receiver end: scheduling and prioritising arrangements
H04L 1/1864
Arrangements specially adapted for the receiver end: aRQ related signaling