User's Manual

S-Series OmniCell@Home Picocell GSM Implementation Guide System Description
998-1027-01 Rev X2
The S-RS provides a mechanism for authenticating each S1 BTS as it joins the service-
provider (SP) network (during system start-up) and initial key exchange for protection of
subsequent signalling communications between the PicoBTS and the S-AGW. In
essence, the S-RS serves as a “gatekeeper” – ensuring that only authenticated PicoBTS
equipment may reach the S-AGW via its backhaul IP address.
The S-EMS is used to manage the operation of the S-Series AGW and PicoBTS network
elements. The S-EMS performs typical Element Manager Layer (EML) services as
defined by the Telecommunications Management Network (TMN) model. The S-EMS
provides management functions in addition to the GSM management provided by the
MNO’s existing OMC across the Abis interface.
2.2 PicoBTS Functional Block Diagram
Figure 3 shows the functional subsystems of the PicoBTS. These are described in the
following paragraphs.
RF Monitor
The RF monitor functional block is a GSM receiver capable of receiving in the 900/1800
and 850/1900 bands. The purpose of this block is to monitor the radio environment and
look for carriers from the macro network as well as carriers from other nearby PicoBTS
units. Signal information from these sources is passed to the Host CPU block where it is
used for frequency planning and other system-management functions.
EDGE/GPRS/GSM
This block is the PicoBTS quad-band transceiver. It performs the radio functions required
in a base station as well as baseband processing of transmitted and received signals.
Though not strictly part of the transceiver, the SIM-card reader is included in this block as
it interfaces directly to the FPGA.
Host CPU
This block performs a variety of control and processing functions necessary for operation
of the HRBS. The WLAN transceiver, router, GSM transceiver and RF monitoring
sections interface to the host CPU.
Router and Ethernet PHY
In addition to providing LAN capability, the router section allows additional Ethernet
connections to the ISP network.
RadioFrame Networks, Inc. SUPPLIER AND CUSTOMER INFORMATION 11