User's Manual

CHAPTER 2. Overview of SPI-2213

2-2

2.2 Characteristics of SPI-2213

The SPI-2331 supports 10 MHz bandwidth per carrier and has a large packet service in

high speed. Other features are as follows.

Application of the OFDMA Method

OFDMA is used to transmit data to several users simultaneously by using the sub-carrier

allocated to each user and transmit data by allocating one or more sub-carriers to a specific

subscriber according to the channel status and the transmission rate requested by a user.

In addition, since it can select the sub-carriers with excellent features for each subscriber

and allocate them to the subscribers when some subscribers divide and use the whole sub-

carrier, it can raise the data throughput by distributing the resources efficiently.

Separate DU and RRH Structure

As the SPI-2213 consists of a DU and an RRH, it is easy to set up a network and it is easy

to change the network configuration.

For connections between the DU and RRH, data traffic signals and OAM information are

sent/received through the ‘Digital I/Q and C & M’ interface based on the Common Public

Radio Interface (CPRI). Physically, optic cables are used.

Each of the DUs and RRHs receives -48 VDC of power for its operation.

y Versatile Network Operation

The RRH cannot operate on its own, but operates by being linked to the DU. The RRH

is highly flexible in its installation, and helps with setting up a network in a variety of

configurations depending on the location and operation method.

y Easy Installation

The optic interface component that interfaces with the DU and the RF signal

processing component is integrated into the RRH, which becomes a very small and

very light single unit. Therefore, the RRH can be installed on a wall or pole.

Moreover, as the distance between the RRH and antenna is minimized, the loss of RF

signals due to the antenna feeder line can be reduced so that more enhanced RF

receiving performance than the existing rack-type RAS can be provided.

y Natural Cooling

Because the RRH is installed outdoors and has an efficient design, it can radiate heat

efficiently without any additional cooling system. Therefore, no additional

maintenance cost is needed for cooling the RRH.

y Loopback Test

The SPI-2213 provides the loopback test function to check whether communication is

normal on the ‘Digital I/Q and C & M’ interface line between the DU and RRH.

y Remote Firmware Downloading

The operator can upgrade the RRH and its service by replacing its firmware.

Without visiting the field station, the operator can download firmware to the RRH

remotely using a simple command from the WSM.

In this way, operators can minimize the number of visits to the field station, reducing

maintenance costs and allowing the system to be operated with greater ease.