Vanu Inc. 0PW1C0010 Manual Do Utilizador

Vanu Anywave BSS Operator Guide — DRAFT

1.4

Benefits of the Vanu Anywave BSS

The Vanu Anywave base station provides Radio Access Network (RAN) functionality by implementing a
complete GSM Base Station Subsystem (BSS) in software on a single general-purpose server. Signal
processing, protocol processing, and other radio access network functionality are implemented as
application level software running on top of the Debian GNU/Linux operating system.

Features

The Vanu Base Station System (BSS) has four major software components:

• The Base Transceiver Station (BTS) handles communication over the air interface with individual

mobiles. A BTS can handle many radio links simultaneously, and is responsible for any ciphering
over the air interface.

• The Base Station Controller (BSC) acts to manage a number of BTSs on functions such as radio

resource allocation, mobile handover, and passing messages to the mobile from the core network.

• The Transcoder and Rate Adapter Unit (TRAU) performs transcoding for speech channels and rate

adaptation for data channels, as necessary.

• The Packet Control Unit (PCU) is only found in a GPRS (General Packet Radio Service) network.

The PCU handles the radio resource aspects of GPRS connections.

Working together, these components integrate into a complete BSS solution that provides the full
functionality of a GSM Radio Access Network (RAN).

The Vanu Anywave System seamlessly connects mobiles to the phone network by first making a
mobile-to-BTS connection via the radio (or “air”) interface. The BTS is connected to, and exchanges
data with, the BSC via the Abis interface. The BSC then communicates to the MSC via the A interface.

In the data domain, there is a similar Gbis interface between the BTS and PCU, and a Gb interface
between the PCU and SGSN (Serving GPRS Support Node) for GPRS data.

A full base station is composed of the following major subsystems:

• An RF Front End, supporting the 850, 900, 1800, or 1900 MHz bands, which perform

Analog-to-Digital and Digital-to-Analog conversions, as well as up/down mixing and duplex
functionality.

• Waveform processing performed by the Anywave BTS software on a standard commercial server.

• A GPS timing reference.

• A typical BTS installation has other important parts that are not considered Vanu Anywave

components, such as: antenna(s), amplifier(s), power conditioning, and others.