LTE (E-UTRA) UM RLC PDU Encoding With Examples

LTE Unacknowledged Mode (UM) RLC PDU overview is discussed in another tutorial. If you want to learn the basics of UM data PDUs you can check the following tutorial.

In this tutorial examples for most important encoding techniques used for UM RLC PDUs are discussed.


UMD PDU with 5 bit SN (No LI)

Assumptions

Sequence Number (SN) Length: 5 bits
Sequence Number: 1
Service Data Unit (SDU): 01 02 03 04 05
Framing Info: 00
00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

No Length Indicator is used.


UMD PDU with 10 bit SN (No LI)

Assumptions

Sequence Number (SN) Length: 10 bits
Sequence Number: 1
Service Data Unit (SDU): 01 02 03 04 05
Framing Info: 00
00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

No Length Indicator is used.


UMD PDU with 5 bit SN (Odd number of LIs)

Sequence Number (SN) Length: 5 bits
Sequence Number: 1

SDU-1: 01 02 03
SDU-2: 04 05
SDU-3: 06 07 08

Framing Info: 00

00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

SDUs are hex data.


UMD PDU with 5 bit SN (Even number of LIs)

Sequence Number (SN) Length: 5 bits
Sequence Number: 1

SDU-1: 01 02 03
SDU-2: 04 05

Framing Info: 00

00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

SDU are hex data.


UMD PDU with 10 bit SN (Odd number of LIs)

Sequence Number (SN) Length: 10 bits
Sequence Number: 1

SDU-1: 01 02 03
SDU-2: 04 05
SDU-3: 06 07 08

Framing Info: 00

00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

SDU are hex data.


UMD PDU with 10 bit SN (Even number of LIs)

Sequence Number (SN) Length: 10 bits
Sequence Number: 1

SDU-1: 01 02 03
SDU-2: 04 05

Framing Info: 00

00: First byte of the data field corresponds to first byte of a RLC SDU & last byte of the Data field corresponds to last byte of a RLC SDU.

SDU are hex data.


Further Studies