ltePDCCHInfo

PDCCH resource information

Syntax

info = ltePDCCHInfo(enb)

Description

info = ltePDCCHInfo(enb) returns a structure info containing information about the Physical Downlink Control Channel (PDCCH) subframe resources.

Within a non-MBMS downlink subframe, the first info.NSymbols OFDM symbols represent its control region and carry the PCFICH, PHICH and PDCCH. info.NRE indicates the number of non-reference resource elements (RE), not assigned to the PCFICH or PHICH, that are associated with PDCCH transmission. These resources carry the set of PDCCH where each PDCCH carries a single encoded DCI message. Each PDCCH can be transmitted on 1,2,4, or 8 control channel elements (CCE), where 1 CCE = 9 REG = 36 RE = 72 bits. As such, not all the NRE elements can carry actual PDCCH instances, with (info.NRE – info.NREUsed) being unavailable for PDCCH transmission.

Examples

Get PDCCH Information

Get information about the PDCCH subframe resources for RMC R.0.

enb = lteRMCDL('R.0');
info = ltePDCCHInfo(enb)

info = struct with fields:
        NREG: 113
         NRE: 452
        NCCE: 12
    NREGUsed: 108
     NREUsed: 432
        MTot: 904
    NSymbols: 3

Input Arguments

enb — Cell-wide settings structure

scalar structure

Cell-wide settings, specified as a scalar structure. enb is a structure having the following fields.

Parameter Field	Required or Optional	Values	Description
NDLRB	Required	Integer within the range (6,...,110)	Number of downlink resource blocks ($$N_{\text{RB}}^{\text{DL}}$$)
CyclicPrefix	Optional	'Normal' (default), 'Extended'	Cyclic prefix length
CellRefP	Required	1, 2, 4	Number of cell-specific reference signal (CRS) antenna ports
CFI	Required	1, 2, 3	Control format indicator value
Ng	Required	'Sixth', 'Half', 'One', 'Two'	HICH group multiplier
DuplexMode	Optional	'FDD' (default), 'TDD'	Duplexing mode, specified as either: 'FDD' for Frequency Division Duplex 'TDD' for Time Division Duplex
NSubframe	Required	0 (default), nonnegative scalar integer	Subframe number
The following field is required when DuplexMode is set to 'TDD'.
TDDConfig	Optional	0, 1 (default), 2, 3, 4, 5, 6	Uplink–downlink configuration

Data Types: struct

Output Arguments

info — PDCCH subframe resource information

structure

PDCCH subframe resource information, returned as a structure. info contains the following fields.

Parameter Field	Values	Description
NRE	Numeric scalar	Total number of resource elements (REs) associated with PDCCHs (4×NREG)
NREG	Numeric scalar	Total number of resource element groups (REGs) associated with PDCCHs (4×NRE)
MTot	Numeric scalar	Total number of bits associated with PDCCHs, returned as a numeric scalar (8×NREG). MTot is the maximum number of input bits that can be transmitted on the NRE symbols (MTot = 2 × NRE = 8 × NREG).
NCCE	Numeric scalar	Number of control channel elements available for actual PDCCH usage
NREGUsed	Numeric scalar	Number of resource element groups (REGs) available for actual PDCCH usage
NREUsed	Numeric scalar	Number of resource elements (REs) available for actual PDCCH usage
NSymbols	Numeric scalar	Total number of OFDM symbols spanned by the PDCCH

Data Types: struct

Version History

Introduced in R2014a