Protocol++® (Protocolpp®)  v5.6.2
jltesa Class Reference

#include "include/jltesa.h"

Detailed Description

Long Term Evolution (LTE) Security Association

LTE Protocol Stack at the Data-Link Layer [1]

See PDCP_LTE_v14_1_0 specification on www.3gpp.org

If not otherwise mentioned in the definition of each field then the bits in the parameters shall be interpreted as follows: the left most bit string is the first and most significant and the right most bit is the last and least significant bit

Unless otherwise mentioned, integers are encoded in standard binary encoding for unsigned integers. In all cases the bits appear ordered from MSB to LSB when read in the PDU

PDCP SN

Length: 5, 7, 12, 15, 16, or 18 bits as indicated in the following table except for NB-IoT which uses 7 bit PDCP SN for DRB.

$ PDCP SN Length$
LengthDescription
5 SRBs
7 DRBs, if configured by upper layers (pdcp-SN-Size)
12 DRBs, if configured by upper layers (pdcp-SN-Size)
15 DRBs, if configured by upper layers (pdcp-SN-Size)
16 SLRBs
18 DRBs, if configured by upper layers (pdcp-SN-Size)

Data

Length: Variable

The Data field may include either one of the following:

  • Uncompressed PDCP SDU (user plane data, or control plane data); or
  • Compressed PDCP SDU (user plane data only)

MAC-I

Length: 32 bits

The MAC-I field carries a message authentication code calculated as specified in subclause 5.7 For control plane data that are not integrity protected, the MAC-I field is still present and should be padded with padding bits set to 0

COUNT

Length: 32 bits

For ciphering and integrity a COUNT value is maintained. The COUNT value is composed of a HFN and the PDCP SN. The length of the PDCP SN is configured by upper layers

Format of COUNT
HFNPDCP SN

The size of the HFN part in bits is equal to 32 minus the length of the PDCP SN.

NOTE: When performing comparison of values related to COUNT, the UE takes into account that COUNT is a 32-bit value, which may wrap around (e.g., COUNT value of 232 - 1 is less than COUNT value of 0).

R

Length: 1 bit

Reserved. In this version of the specification reserved bits shall be set to 0. Reserved bits shall be ignored by the receiver

D/C

Length: 1 bit

$ D/C field$
BitDescription
0Control PDU
1Data PDU

PDU type

Length: 3 bits

$ PDU type$
BitDescription
000PDCP status report
001Interspersed ROHC feedback packet
010LWA status report
011-111Reserved

FMS

Length: 12 bits when a 12 bit SN length is used, 15 bits when a 15 bit SN length is used, and 18 bits when an 18 bit SN length is used

PDCP SN of the first missing PDCP SDU

Bitmap

Length: Variable

The length of the bitmap field can be 0

The MSB of the first octet of the type "Bitmap" indicates whether or not the PDCP SDU with the SN (FMS + 1) modulo (Maximum_PDCP_SN + 1) has been received and, optionally decompressed correctly. The LSB of the first octet of the type "Bitmap" indicates whether or not the PDCP SDU with the SN (FMS + 8) modulo (Maximum_PDCP_SN + 1) has been received and, optionally decompressed correctly

For API Documentation:

See also
ProtocolPP::jsecass
ProtocolPP::jprotocol
ProtocolPP::jlte
ProtocolPP::jltesa
ProtocolPP::jsnow3g
ProtocolPP::jzuc
ProtocolPP::jmodes

For Additonal Documentation:

See also
jsecass
jprotocol
jlte
jltesa
jsnow3g
jzuc
jmodes
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The documentation for this class was generated from the following file: