lteDuplexingInfo

Duplexing information

Syntax

info = lteDuplexingInfo(enb)

Description

info = lteDuplexingInfo(enb) returns a structure, info, providing information on the duplexing arrangement. For more information, see Duplex Mode Configuration.

Examples

Get TDD Downlink Frame Duplexing Information

Get the number of downlink OFDM symbols in each subframe for a TDD (configuration 0) frame.

A Configuration 0 TDD frame is organized as follows:

• Only subframes 0, 1, 5, and 6 will contain a non-zero number of DL OFDM symbols.

• Subframe 0 and 5 are designated for DL.

• Subframes 1 and 6 are special subframes.

• Subframes 2, 3, 4, 7, 8, and 9 are designated for UL.

Initialize a cell-wide configuration structure for RMC R.0 and a Configuration 0 TDD frame.

enb = lteRMCDL('R.0');
enb.DuplexMode = 'TDD';
enb.SSC = 0;
enb.TDDConfig = 0;

Loop through all subframes in a frame.

for n = 0:9
    enb.NSubframe = n;
    duplexInfo = lteDuplexingInfo(enb);
    fprintf('DL symbols in subframe %d: %d\n',n,duplexInfo.NSymbolsDL)
end

DL symbols in subframe 0: 14
DL symbols in subframe 1: 3
DL symbols in subframe 2: 0
DL symbols in subframe 3: 0
DL symbols in subframe 4: 0
DL symbols in subframe 5: 14
DL symbols in subframe 6: 3
DL symbols in subframe 7: 0
DL symbols in subframe 8: 0
DL symbols in subframe 9: 0

Input Arguments

enb — Cell-wide settings

structure

Cell-wide settings, specified as a structure containing these fields. For more information, see Duplex Mode Configuration.

CyclicPrefix — Cyclic prefix length in downlink

'Normal' (default) | 'Extended' | optional

Cyclic prefix length in downlink, specified as 'Normal' or 'Extended'.

Data Types: char

CyclicPrefixUL — Cyclic prefix length in uplink

'Normal' (default) | 'Extended' | optional

Cyclic prefix length in uplink, specified as 'Normal' or 'Extended'.

Data Types: char | string

DuplexMode — Duplexing mode

'FDD' (default) | 'TDD' | optional

Duplexing mode, specified as 'FDD' or 'TDD'.

Data Types: char | string

TDDConfig — Uplink or downlink configuration

0 (default) | integer from 0 to 6 | optional

Uplink or downlink configuration, specified as an integer from 0 to 6. Required only if DuplexMode is set to 'TDD'.

Data Types: double

SSC — Special subframe configuration

0 (default) | integer from 0 to 9 | optional

Special subframe configuration, specified as an integer from 0 to 9. Required only if DuplexMode is set to 'TDD'.

Data Types: double

NSubframe — Subframe number

nonnegative integer

Subframe number, specified as a nonnegative integer. Required only if DuplexMode is set to 'TDD'.

Data Types: double

Data Types: struct

Output Arguments

info — Duplexing information

structure

Duplexing information, returned as a structure containing the following fields.

NSymbols — Total number of symbols in subframe

nonnegative integer

Total number of symbols in subframe, returned as a nonnegative integer.

SubframeType — Type of subframe

'Downlink' | 'Uplink' | 'Special'

Type of subframe, returned as 'Downlink', 'Uplink', or 'Special'.

NSymbolsDL — Number of symbols used for transmission in downlink

nonnegative integer

Number of symbols used for transmission in downlink, returned as a nonnegative integer.

NSymbolsGuard — Number of symbols in the guard period

nonnegative integer

Number of symbols in the guard period, returned as a nonnegative integer.

NSymbolsUL — Number of symbols used for transmission in uplink

nonnegative integer

Number of symbols used for transmission in uplink (UL), returned as a nonnegative integer.

More About

Duplex Mode Configuration

For FDD duplex mode:

• If CyclicPrefixUL is present, the link direction is assumed to be uplink.

• If CyclicPrefixUL is not present, the link direction is assumed to be downlink, and cyclic prefix is set according to CyclicPrefix.

  • If CyclicPrefix is also not present, the default 'Normal' cyclic prefix is used.

For TDD duplex mode:

• The subframe type can be uplink, downlink, or special. TDDConfig and NSubframe identify the subframe type as specified in TS 36.211 [1], Table 4.2-2.

  • For uplink or downlink subframes, CyclicPrefixUL or CyclicPrefix, respectively, indicate the relevant cyclic prefix setting.

  • For special subframes, the lteDuplexingInfo function uses SSC and CyclicPrefix to identify the special subframe configuration, as specified in TS 36.211 [1], Table 4.2-1.

References

[1] 3GPP TS 36.211. “Physical Channels and Modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). URL: http://www.3gpp.org.