ltePHICHInfo

PHICH resource information

Syntax

info = ltePHICHInfo(enb)

Description

info = ltePHICHInfo(enb) returns a structure, info, containing information about the physical hybrid ARQ indicator channel (PHICH) subframe resources.

Examples

Get PHICH Resource Information

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

Get PHICH Resource Information from RMC

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

enb — eNodeB cell-wide settings

scalar structure

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. ($$N_{\text{RB}}^{\text{DL}}$$)
CyclicPrefix	Optional	'Normal' (default), 'Extended'	Cyclic prefix length
Ng	Required	'Sixth', 'Half', 'One', 'Two'	HICH group multiplier
PHICHDuration	Optional	Nonnegative scalar integer	PHICH duration
DuplexMode	Optional	'FDD' (default), 'TDD'	Duplexing mode, specified as: 'FDD' for Frequency Division Duplex or 'TDD' for Time Division Duplex
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

info — PHICH subframe resource information

scalar structure

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.