User's Manual

Ver.
CHAPTER 3. System Structure
2600-00FKQFGA2
1.0
 IPSS: Provides the QoS and security function for the IP backhaul.
− Backhaul bandwidth restriction
− QCI to DSCP mapping
− DSCP to CoS mapping
− Ciphering of backhaul traffic and integrity protection by using IPsec
3.2.2 CPS Block
The Call Processing Software (CPS) block performs the resource management of the LTE
eNB and the call processing function in the eNB defined in the 3GPP and performs the
interface function with the EPC, UE, and neighbor eNBs. The CPS consists of the eNB
control processing subsystem (ECS) which is responsible for network access and call
control functions, and the eNB Data processing Subsystem (EDS) which is responsible for
user traffic handling.
In addition, depending on the eNB functions defined in 3GPP, the ECS consists of ECMB,
ECCB, SCTB, CSAB and TrM; and the EDS consists of GTPB, PDCB, RLCB and MACB.
The following shows the CPS structure.
Stream Control Transmission protocol Block (SCTB)
The SCTB is responsible for establishing the S1 interface between the eNB and the MME,
and establishes the X2 interface between neighbor eNBs.
The major functions of the SCTB are as follows:
 S1 interfacing
 X2 interfacing
eNB Common Management Block (ECMB)
The ECMB performs call processing function such as the system information transmission
and the eNB overload control for each eNB and cell.
The major functions of the ECMB are as follows:
 Setting/Releasing cell
 Transmitting system information
 eNB overload control: controls the eNB overload depending on CPU load status
 Access barring control: controls the access barring parameters of SIB2
 Resource measurement control: controls the measurement of the resource status in the
system, such as PRB usage and PDB
 Transmission of cell load information: Inter-system X2 load information message
transmission
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