User's Manual

Ver.
CHAPTER 3. System Structure
2600-00FKQFGA2
1.0
eNB Call Control Block (ECCB)
The ECCB performs the function to control the call procedure until exit after call setup and
the call processing function for the MME and neighbor eNBs.
The major functions of the ECCB are as follows:
 Radio resource management
 Idle to Active status transition
 Setting/changing/releasing bearer
 Paging Functions
 MME selection/load balancing
 Call admission control
 Security function
 Handover control
 UE measurement control
 Statistics processing
Trace Management (TrM)

Call Trace function
 Call Summary Log (CSL) function
GPRS Tunneling Protocol Block (GTPB)
The GTPB is the user plane call processing function of the eNB. It processes the GTP.
The major functions of the GTPB are as follows:
 GTP tunnel control
 GTP management
 GTP data transmission
PDCP Block (PDCB)
The PDCB is the user plane call processing function of the eNB. It processes the PDCP.
The major functions of the 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
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