lteSLMIB

Sidelink MIB encoding and decoding

Syntax

mibslout = lteSLMIB(ue)

ueout = lteSLMIB(mibsl)

ueout = lteSLMIB(mibsl,ue)

Description

mibslout = lteSLMIB(ue) returns the encoded sidelink MIB (MIB-SL) RRC message bits for the specified UE settings structure.

For more information, see MIB-SL Message Processing.

ueout = lteSLMIB(mibsl) performs the inverse processing of the preceding syntax, returning a UE parameter structure after decoding the input MIB-SL message bits.

ueout = lteSLMIB(mibsl,ue) returns the UE settings structure, updating any fields contained in the input UE parameter structure with values decoded from mibsl.

Examples

Create MIB-SL Message

Create the 40-bit MIB-SL associated with the parameter values to be carried on the message.

Initialize a UE-specific configuration structure with 10 MHz bandwidth for TDD.

ue.NSLRB = 50;
ue.DuplexMode = 'TDD';
ue.TDDConfig  = 6;
ue.NFrame = 5;
ue.NSubframe = 1;
ue.InCoverage = 1;

Generate the 40-bit MIB-SL message using the ue structure.

mibsl = lteSLMIB(ue);

Decode MIB-SL Message

Decode the 40-bit MIB-SL message, creating a received parameter structure from the message.

Initialize a UE-specific configuration structure with 5 MHz bandwidth for TDD.

ue.NSLRB = 25;
ue.DuplexMode = 'TDD';
ue.TDDConfig = 6;
ue.NFrame = 5;
ue.NSubframe = 1;
ue.InCoverage = 1

ue = struct with fields:
         NSLRB: 25
    DuplexMode: 'TDD'
     TDDConfig: 6
        NFrame: 5
     NSubframe: 1
    InCoverage: 1

Generate the 40-bit MIB-SL message using the ue structure.

mibsl = lteSLMIB(ue);

Convert the MIB-SL bit vector back into a parameter set. Compare this parameter set with the transmission set.

rxparams = lteSLMIB(mibsl)

rxparams = struct with fields:
         NSLRB: 25
    DuplexMode: 'TDD'
     TDDConfig: 6
        NFrame: 5
     NSubframe: 1
    InCoverage: 1

isequal(rxparams,ue)

ans = logical
   1

Update UE Structure Using MIB-SL Message

Update UE-specific parameter configuration structure settings using the 40-bit MIB-SL message. Encode an MIB-SL message based on one ue structure parameter set.

Encode an MIB-SL message from one UE-specific configuration

Initialize a UE-specific configuration structure with 5 MHz bandwidth for TDD. Encode a 40-bit MIB-SL message using the ue1 structure.

ue1.NSLRB = 25;
ue1.DuplexMode = 'TDD';
ue1.TDDConfig = 6;
ue1.NFrame = 5;
ue1.NSubframe = 1;
ue1.InCoverage = 1;

mibsl = lteSLMIB(ue1);

Create a second UE-specific configuration

Initialize a second UE-specific configuration structure with a different configuration. Compare ue2 with ue1.

ue2.NSLRB = 75;
ue2.DuplexMode = 'TDD';
ue2.TDDConfig = 2;
ue2.NFrame = 2;
ue2.NSubframe = 2;
ue2.InCoverage = 0;

isequal(ue2,ue1)

ans = logical
   0

Update the second UE-specific configuration based on the MIB-SL message

Using mibsl, update the settings in ue2 to match ue1. Compare ue2 with ue1.

ue2 = lteSLMIB(mibsl,ue2);
isequal(ue2,ue1)

ans = logical
   1

Input Arguments

ue — User equipment settings

structure

User equipment settings, specified as a parameter structure containing these fields:

NSLRB — Number of sidelink resource blocks

integer scalar from 6 to 110

Number of sidelink resource blocks, specified as an integer scalar from 6 to 110.

Example: 6, which corresponds to a channel bandwidth of 1.4 MHz.

Data Types: double

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. (tdd-ConfigSL-r12)

TDDConfig is applicable for TDD duplex mode only.

Data Types: double

NFrame — Direct frame number

0 (default) | nonnegative integer | optional

Direct frame number, specified as a nonnegative integer. (directFrameNumber-r12)

Data Types: double

NSubframe — Direct subframe number

0 (default) | nonnegative integer | optional

Direct subframe number, specified as a nonnegative integer. (directSubframeNumber-r12)

Data Types: double

InCoverage — Indicates whether UE is in E-UTRAN coverage

0 (default) | 1 | optional

Indicates whether the UE transmitting the MIB-SL is in E-UTRAN coverage, specified as 0 (not in coverage) or 1 (in coverage). (inCoverage-r12).

Data Types: double

Data Types: struct

mibsl — MIB-SL message bit sequence

40-bit column vector

MIB-SL message bit sequence, specified as a 40-bit column vector.

For more information, see MIB-SL Message Processing.

Data Types: double | int8 | logical

Output Arguments

mibslout — MIB-SL message bit sequence

40-bit column vector

MIB-SL message bit sequence, returned as a 40-bit column vector.

For more information, see MIB-SL Message Processing.

Data Types: int8

ueout — User equipment settings

structure

User equipment settings, returned as a parameter structure containing these fields:

NSLRB — Number of sidelink resource blocks

0, 6, 15, 25, 50, 75, or 100

Number of sidelink resource blocks, returned as an integer from the set {0, 6, 15, 25, 50, 75, 100}. ($$N_{\text{RB}}^{\text{SL}}$$)

For more information on sidelink bandwidths, see MIB-SL Message Processing.

Data Types: int32

DuplexMode — Duplexing mode

'FDD' | 'TDD'

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

Data Types: char

TDDConfig — Uplink or downlink configuration

integer from 0 to 6

Uplink or downlink configuration, returned as an integer from 0 to 6. (tdd-ConfigSL-r12)

TDDConfig is applicable for TDD duplex mode only.

Data Types: int32

NFrame — Direct frame number

nonnegative integer

Direct frame number, returned as a nonnegative integer. (directFrameNumber-r12)

Data Types: int32

NSubframe — Direct subframe number

nonnegative integer

Direct subframe number, returned as a nonnegative integer. (directSubframeNumber-r12)

Data Types: int32

InCoverage — Indicates when UE is in E-UTRAN coverage

0 | 1

Indicates when UE is in E-UTRAN coverage, returned as 0 or 1. (inCoverage-r12) The UE transmitting the MIB-SL is:

• Not in E-UTRAN coverage when InCoverage = 0.

• In E-UTRAN coverage when InCoverage = 1.

Data Types: int32

Data Types: struct

More About

MIB-SL Message Processing

The MIB-SL message is a 40 bits long and defined in TS 36.331 [1], Section 6.5.2. The message is sent from UE to UE on the PC5 interface via the SL-BCH transport channel on the SBCCH logical channel. MIB-SL contains sl-Bandwidth-r12, tdd-ConfigSL-r12, directFrameNumber-r12, directSubframeNumber-r12, inCoverage-r12, and 19 bits reserved for future.

• When encoding the MIB-SL message:

  • If NSLRB is not one of the set {6,15,25,50,75,100}, then all ones are inserted into the first three bits (sl-Bandwidth-r12 bit field) of the MIB message.

• When decoding the MIB-SL message:

  • If the first three bits (sl-Bandwidth-r12 bit field) of the input MIB-SL message do not contain the equivalent of a decimal from 0 to 5 (MSB first, corresponding to the PRB set {6,15,25,50,75, 100}) then NSLRB is returned as 0.

  • If the input MIB-SL messages are not 40 bits, the messages are either truncated to 40 elements or zero padded as needed.

References

[1] 3GPP TS 36.331. “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.

Version History

Introduced in R2016b