User's Manual

Confidential

Chapter 3 System Structure

LTE eNB System Description v2.0 43

The major functions of PDCB are as follows:

 Header compression or decompression (ROHC only)

 Transmitting user data and control plane data

 PDCP sequence number maintenance

 DL/UL data forwarding at handover

 Ciphering and deciphering for user data and control data

 Control data integrity protection

 Timer-based PDCP SDU discarding

Radio Link Control Block (RLCB)

The RLCB is the user plane call processing function of eNB. It processes the RLC

protocol. It operates on the call processing board.

The major functions of RLCB are as follows:

 Transmission for the upper layer PDU

 ARQ function used for the AM mode data transmission

 RLC SDU concatenation, segmentation and reassembly

 Re-segmentation of RLC data PDUs

 In sequence delivery

 Duplicate detection

 RLC SDU discard

 RLC re-establishment

 Protocol error detection and recovery

Medium Access Control Block (MACB)

The MACB is the user plane call processing function of eNB. It processes the

MAC protocol. It operates on the call processing board.

The major functions of MACB are as follows:

 Mapping between the logical channel and the transport channel

 Multiplexing & de-multiplexing

 HARQ

 Transport format selection

 Priority handling between UEs

 Priority handling between logical channels of one UE