# US 2010/0246455 A1 · PHICH Resource Signaling in a Wireless Communication System

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- Number: US 2010/0246455 A1
- Document ID: US20100246455A1
- Status: Published application
- Kind: A1
- Application number: 12/410,449
- Filed: 2009-03-24
- Published: 2010-09-30
- Earliest claimed: 2009-03-24
- Assignees: Motorola, Inc.
- Inventors: Vijay Nangia; Robert T. Love; Ravikiran Nory
- Web page: https://patentgrep.com/patent/US20100246455A1

## CPC

- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1896: {ARQ related signaling}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 27/2607: {Cyclic extensions}
- H04W 72/04: Wireless resource allocation
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A wireless communication terminal and method for determining a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups (N) in the downlink subframe based on a first parameter, a second parameter and a determined cyclic prefix (CP) duration, wherein the first parameter indicates a downlink system bandwidth in terms of a number of resource blocks and the second parameter indicates a scaling factor. The terminal receives downlink control signaling in a set of resource elements in the subframe, wherein the set of resource elements is determined based partly on the number of PHICH groups (N).

## Claims

### Claim 1

A method in a wireless communication terminal, the method comprising:
determining a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups (N) in the downlink subframe based on a first parameter, a second parameter and a determined cyclic prefix (CP) duration,
the first parameter indicating a downlink system bandwidth in terms of a number of resource blocks, the second parameter indicating a scaling factor; and
receiving downlink control signaling in a set of resource elements in the subframe, wherein the set of resource elements is determined based partly on the number of PHICH groups (N).

### Claim 2 (depends on 1)

The method of claim 1, the second parameter indicating a scaling factor that is selected from a set of values comprising: 1/6; 1/2; 1; and 2.

### Claim 3 (depends on 1)

The method of claim 1,
the cyclic prefix duration corresponds to either a normal CP duration or to an extended CP duration,
determining a number of PHICH groups (N) using the following equation:
N
=
{
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


normal


C


P
2
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


extended


C


P
wherein the first parameter corresponds to NRBDL and the second parameter corresponds to Nh.

### Claim 4 (depends on 1)

The method of claim 1, determining the set of resource elements based on the number of PHICH groups (N) and a PHICH duration (M).

### Claim 5 (depends on 4)

The method of claim 4, receiving a master information block (MIB), the MIB including the first parameter (NRBDL), the second parameter (Nh), and the PHICH duration (M).

### Claim 6 (depends on 1)

The method of claim 1, the downlink control signaling in the set of resource elements in the downlink subframe comprises a physical downlink control channel (PDCCH).

### Claim 7 (depends on 1)

The method of claim 1, the downlink control signaling in the set of resource elements in the downlink subframe comprises a PHICH.

### Claim 8 (depends on 1)

The method of claim 1, operating the wireless communication terminal in a time division duplexing (TDD) mode, determining whether the downlink subframe includes PHICH groups (N) based on a position of the downlink subframe within a radio frame wherein the radio frame comprises a plurality of subframes.

### Claim 9 (depends on 1)

The method of claim 1,
operating the wireless communication terminal in a time division duplexing (TDD) mode,
determining a position of the downlink subframe within a radio frame wherein the radio frame comprises a plurality of subframes,
determining the number of PHICH groups (N) in the downlink subframe based on the position of the downlink subframe in the radio frame.

### Claim 10 (depends on 9)

The method of claim 9,
the cyclic prefix duration corresponds to either a normal CP duration or to an extended CP duration,
determining a number of PHICH groups (N) using the following equation:
N
=
{
k
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


normal


C


P
k
*
2
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


extended


C


P
wherein the first parameter corresponds to NRBDL and the second parameter corresponds to Nh and k is a scaling factor based on the position of the downlink subframe in the radio frame.

### Claim 11 (depends on 10)

The method of claim 10, the scaling factor, k, is selected from a set of values comprising: 0; 1; and 2.

### Claim 13 (depends on 9)

The method of claim 9, determining the number of PHICH groups (N) in the downlink subframe based on the position of the downlink subframe in the radio frame and based on an uplink/downlink configuration of the radio frame.

### Claim 14 (depends on 1)

The method of claim 1,
operating the wireless communication terminal in a frequency division duplexing (FDD) mode,
receiving a radio frame wherein the radio frame comprises a plurality of downlink subframes,
determining a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups (N) in each downlink subframe.

### Claim 15 (depends on 1)

The method of claim 1, determining whether a downlink subframe is configured with a normal cyclic prefix duration or an extended cyclic prefix duration.

### Claim 16

A wireless communication terminal comprising:
a transceiver;
a controller coupled to the transceiver,
the wireless communication terminal configured to determine a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups (N) in the downlink subframe based on a first parameter, a second parameter and a determined cyclic prefix (CP) duration,
the first parameter indicating a downlink system bandwidth in terms of a number of resource blocks, the second parameter indicating a scaling factor; and
the transceiver configured to receive downlink control signaling in a set of resource elements in the subframe, wherein the set of resource elements is determined based partly on the number of PHICH groups (N).

### Claim 17 (depends on 16)

The terminal of claim 16,
the cyclic prefix duration corresponds to either a normal CP duration or to an extended CP duration,
the wireless communication terminal configured to determine a number of PHICH groups (N) using the following equation:
N
=
{
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


normal


C


P
2
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


extended


C


P
wherein the first parameter corresponds to NRBDL and the second parameter corresponds to Nh.

### Claim 18 (depends on 16)

The terminal of claim 16,
the wireless communication terminal configured to operate in a time division duplexing (TDD) mode,
the wireless communication terminal configured to determine a position of the downlink subframe within a radio frame wherein the radio frame comprises a plurality of subframes and to determine the number of PHICH groups (N) in the downlink subframe based on the position of the downlink subframe in the radio frame.

### Claim 19 (depends on 18)

The terminal of claim 18,
the cyclic prefix duration corresponds to either a normal CP duration or to an extended CP duration,
the wireless communication terminal configured to determine a number of PHICH groups (N) using the following equation:
N
=
{
k
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


normal


C


P
k
*
2
*
ceil

[
N
h

(
N
RB
DL
/
8
)
]
for


extended


C


P
wherein the first parameter corresponds to NRBDL and the second parameter corresponds to Nh and k is a scaling factor based on the position of the downlink subframe in the radio frame.

### Claim 20 (depends on 18)

The terminal of claim 18, the wireless communication terminal configured to determine the number of PHICH groups (N) in the downlink subframe based on the position of the downlink subframe in the radio frame and based on an uplink/downlink configuration of the radio frame.