User's Manual

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Chapter 3 System Structure

LTE eNB System Description v2.0 38

 Kernel Manages the operation of multiple software processes and provides

various primitives to optimize the use of limited resources.

 RFS: Stores and manages the binary files, libraries, and configuration files

necessary for running and operating the software by File-system Hierarchy

Standard 2.2 (FHS).

 Utility: Provides the functions for managing the complex programmable logic

device (CPLD), LED, watchdog, and environment and inventory information,

measuring and viewing the CPU load, and storing and managing fault

information when a processor goes down.

Device Driver (DD)

The DD allows applications to operate normally on devices that are not directly

controlled from OS in the system. The DD consists of physical DD and virtual DD.

 Physical DD: Provides the interface through which an upper application can

configure, control, and monitor the external devices of the processor. (Switch

device driver and Ethernet MAC driver, and so on.)

 Virtual DD: In case of physical network interfaces, virtual interfaces are

created on the kernel so that the upper applications may control the virtual

interfaces instead of controlling the physical network interfaces directly.

Network Processing Control (NPC)

The NPC, via the interfaces with the upper processes such as IPRS and OAM,

constructs and manages various tables necessary for processing packets of the NP

software described above, and performs the network statistics collection function

and the network status management function.

Network Processing (NP)

The NP is the software which processes the packets required for backhaul interface.

The functions of the NP are as follows:

 Packet RX and TX

 IPv4 and IPv6

 Packet RX and TX

 IPv4 and IPv6

 Packet queuing and scheduling

 MAC filtering

 IP Packet forwarding

 IP fragmentation and reassembly

 Link aggregation

 VLAN termination