lteDLSCHInfo

DL-SCH segmentation information

Syntax

info = lteDLSCHInfo(blklen)

info = lteDLSCHInfo(enb,chs,blklen)

Description

info = lteDLSCHInfo(blklen) returns a structure containing the Downlink Shared Channel (DL-SCH) code block segmentation information for the given transport block length.

info = lteDLSCHInfo(enb,chs,blklen) returns a structure containing the DL-SCH code block segmentation information for the given eNodeB cell-wide settings structure, channel configuration structure, and transport block length.

Examples

Display DL-SCH Segmentation Information

Show the sizing information before turbo coding for an input transport block of length 132. The info structure fields shows that there are 4 filler bits and the total size of the one segment after CRC addition is 160.

lteDLSCHInfo(132)

ans = struct with fields:
       C: 1
      Km: 0
      Cm: 0
      Kp: 160
      Cp: 1
       F: 4
       L: 0
    Bout: 160

Display DL-SCH Transport Channel Information for RMC R.11

Show the DL-SCH transport channel sizing information for an R.11 RMC.

rmc = lteRMCDL('R.11');
lteDLSCHInfo(rmc,rmc.PDSCH,rmc.PDSCH.TrBlkSizes(1))

ans = struct with fields:
          C: 3
         Km: 4288
         Cm: 0
         Kp: 4352
         Cp: 3
          F: 0
          L: 24
       Bout: 13056
    NLayers: 2
         NL: 2
         Qm: 4
        NIR: 0
         RV: 0

Input Arguments

enb — eNodeB cell-wide settings

structure

eNodeB cell-wide settings, specified as a structure containing these parameter fields:

Parameter Field		Required or Optional	Values	Description
DuplexMode		Optional	'FDD' (default), 'TDD'	Duplexing mode, specified as either: 'FDD' for Frequency Division Duplex 'TDD' for Time Division Duplex
When DuplexMode is set to 'TDD' include:
TDDConfig		Optional	0, 1 (default), 2, 3, 4, 5, 6	Uplink–downlink configuration
When chs.TxScheme is set to 'TxDiversity' include:
CellRefP		Optional	1, 2, 4	Number of cell-specific reference signal (CRS) antenna ports

chs — Channel configuration

structure

Channel configuration, specified as a structure. It defines aspects of the PDSCH onto which the codewords are mapped. It also defines the DL-SCH soft buffer size and redundancy versions of the generated codewords.

chs can contain the following fields.

Parameter Field	Required or Optional	Values	Description
Modulation	Required	'QPSK', '16QAM', '64QAM', '256QAM', '1024QAM'	Modulation type, specified as a character vector, cell array of character vectors, or string array. If blocks, each cell is associated with a transport block.
NLayers	Required	Integer from 1 to 8	Total number of transmission layers associated with the transport block or blocks.
TxScheme	Required	'Port0', 'TxDiversity', 'CDD', 'SpatialMux', 'MultiUser', 'Port5', 'Port7-8', 'Port8', 'Port7-14'.	PDSCH transmission scheme, specified as one of the following options. Transmission scheme Description 'Port0' Single antenna port, port 0 'TxDiversity' Transmit diversity 'CDD' Large delay cyclic delay diversity scheme 'SpatialMux' Closed loop spatial multiplexing 'MultiUser' Multi-user MIMO 'Port5' Single-antenna port, port 5 'Port7-8' Single-antenna port, port 7, when NLayers = 1. Dual layer transmission, ports 7 and 8, when NLayers = 2. 'Port8' Single-antenna port, port 8 'Port7-14' Up to eight layer transmission, ports 7–14
RV	Required	Integer vector (0,1,2,3). A one or two column matrix (for one or two codewords).	Specifies the redundancy version for one or two codewords used in the initial subframe number, NSubframe. This parameter field is only for informational purposes and is read-only.
NSoftbits	Optional	Nonnegative scalar integer (default 0)	Total number of soft buffer bits. The default setting of 0 signifies that there is no buffer limit.

blklen — Transport block length

positive scalar integer | two-element positive integer vector

Transport block length, specified as a positive integer or a two-element positive integer vector. A two-element vector defines the length of transport blocks for two codewords.

Data Types: double

Output Arguments

info — DL-SCH code block segmentation information

structure array

DL-SCH code block segmentation information, returned as a structure array including the following fields.

Parameter Field	Description	Values
C	Total number of code blocks	Nonnegative scalar integer
Km	Lower code block size (K–)	Nonnegative scalar integer
Cm	Number of code blocks of size Km (C–)	Nonnegative scalar integer
Kp	Upper code block size (K+)	Nonnegative scalar integer
Cp	Number of code blocks of size Kp (C+)	Nonnegative scalar integer
F	Number of filler bits in first block	Nonnegative scalar integer
L	Number of segment cyclic redundancy check (CRC) bits	Nonnegative scalar integer
Bout	Total number of bits in all segments	Nonnegative scalar integer
When syntax includes enb and chs inputs, output info also includes these fields:
NLayers	Number of layers associated with one codeword	Nonnegative scalar integer
NL	Number of layers used in rate matching calculation	Nonnegative scalar integer
Qm	Bits per symbol variable used in rate matching calculation	Nonnegative scalar integer
NIR	Number of soft bits associated with transport block. Soft buffer size for entire input transport block	Nonnegative scalar integer
RV	RV value associated with one codeword Included if RV is present at the input.	Nonnegative scalar integer

Version History

Introduced in R2014a