ltePHICHInfo
PHICH resource information
Syntax
Description
Examples
Get PHIH resource information for normal cyclic prefix system subframe with 50 DL resource blocks and HICH group multiplier set to 'Sixth'. See that there are 16 PHICH available, split between two PHICH groups of 8 sequences.
Initialize the cell-wide configuration structure, enb
enb.NDLRB = 50;
enb.Ng = 'Sixth';
Display the PHICH information
info = ltePHICHInfo(enb)
info = struct with fields:
NREG: 6
NRE: 24
NPHICH: 16
NGroups: 2
NMappingUnits: 2
NSequences: 8
PHICHDuration: 1
This example shows that for RMC R.14, there are 16 PHICH available, split between two PHICH groups of 8 sequences.
Initialize the cell-wide configuration structure, enb
, using RMC R.14
rc = 'R.14';
enb = lteRMCDL(rc);
Display the PHICH information
info = ltePHICHInfo(enb)
info = struct with fields:
NREG: 6
NRE: 24
NPHICH: 16
NGroups: 2
NMappingUnits: 2
NSequences: 8
PHICHDuration: 1
Input Arguments
eNodeB cell-wide settings, specified as a structure containing these parameter fields:
Parameter Field | Required or Optional | Values | Description |
---|---|---|---|
NDLRB | Required | Scalar integer from 6 to 110 | Number of downlink resource blocks () |
CyclicPrefix | Optional |
| Cyclic prefix length |
Ng | Required |
| HICH group multiplier |
PHICHDuration | Optional | Nonnegative scalar integer | PHICH duration |
DuplexMode | Optional |
| Duplexing mode, specified as either:
|
The following parameters are dependent upon the condition that
DuplexMode is set to
'TDD' . | |||
TDDConfig | Optional | 0, 1 (default), 2, 3, 4, 5, 6 | Uplink–downlink configuration |
NSubframe | Required | 0 (default), nonnegative scalar integer | Subframe number |
Output Arguments
PHICH subframe resource information, returned as a scalar structure. info
contains
the following fields.
Parameter Field | Description | Values | Data Type |
---|---|---|---|
NRE | Number of resource elements (REs) assigned to all PHICH | Nonnegative scalar integer | uint64 |
NREG | Number of resource element groups assigned to all PHICH | Nonnegative scalar integer | uint64 |
NPHICH | Number of individual PHICH available | Nonnegative scalar integer | uint64 |
NGroups | Number of PHICH groups | Nonnegative scalar integer | int8 |
NMappingUnits | Number of PHICH mapping units | Nonnegative scalar integer | int8 |
NSequences | Number of orthogonal sequences in each PHICH group | Nonnegative scalar integer | int8 |
PHICHDuration | PHICH duration | Nonnegative scalar integer | int8 |
The control region of a subframe can contain up to NPHICH
separate PHICHs
with each carrying a single hybrid ARQ ACK or NACK. Multiple PHICHs can be
mapped to the same set of resource elements through PHICH groups. Each PHICH
in a group is carried on one of NSequences
orthogonal
sequences. For mapping to resources, the groups are combined into mapping
units where each unit spans three resource element groups. Thus,
NREG
is 3×NMappingUnits
and
NRE
is
4×3×NMappingUnits
. The Ng
parameter controls the number of groups available for a given bandwidth.
Version History
Introduced in R2014a
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