Overview
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Aricent developed the Network management system,
capable of providing standard and proprietary interfaces and
intuitive GUIs. Aricent has built GSM elements such as Cell Broadcast
center and a Short Message Service Center. It further imparts
FCAPS functionality to manage Base Station Equipment and resources.
Handset Software Development
Aricent engineered a major portion of software for a dual mode
handset. Aricent team built the MMI, the signalling protocol stack
for satellite communication (analogous to GSM stack), FAX/Data
protocol and the telephony application.
The MMI software allows communication between the user and
the mobile terminal. It interfaces with the keypad, LCD driver,
audio speakers and internal control software of the handset.
The selected mobile telephony signalling stacks were also
implemented. These stacks included components such as Data
link Module, Radio Resource Module, Mobility Management Module,
High Penetration Notification Module and Connection Management
Module as well as software modules that managed internal RAM
and SIM Cards. The Fax/Data protocol software provides support
for low-rate (up to 4.8kbps) transparent facsimile and non-transparent
asynchronous data. The telephony application executes telephony
services under control of the MMI.
Aricent has also participated in design of a User Radio Access
Equipment, a user segment equipment for a GPCS system. This
device works as a gateway for providing one or more user terminal
equipments within a building/covered area, access to the external
satellite network, it uses Bluetooth for internally connecting
the user Terminal Equipments (TEs) to the Gateway.
Multi-mode Handset Software
Aricent undertook the development of a Multi-Mode User Terminal
(handset) that supports satellite communication and cellular
communication (D-AMPS, IS-136, Satellite). In Satellite mode,
a user may initiate and receive a call when cellular access
and PSTN phone lines are not available. Further, the user
may choose to use handset in cellular mode when he/she is
within the reach of cellular transmission.
Aricent developed software for most of the components of the
handset including satellite communication stack, Fax / Data
Unit, Man Machine Interface Unit, Short Message Service (SMS)
unit and SIM Controller Unit.
The signalling stack consists of the following components:
Data Link layer (layer 2), Radio Resource Layer, Mobility
Management Layer, Call Control and Management Layer, High
Penetration Notification (HPN) Layer and Application Layer.
The MMI interface provides users with feature-rich graphics
displays. Using Fax / Data feature of the handset, users can
transmit and receive data or fax messages.
The following diagram shows the overall software architecture
of the handset and (in shaded portion) the software developed
by Aricent for this handset.
The handset also supports sending and receiving of short
message services (SMS) and supplementary services including
call waiting, call hold, Calling Line Identity Presentation
(CLIP) and Calling Line Identification Restriction (CLIR).
The software was supported on ARM processor running the real-time
VxWorks operating system. A major challenge of this implementation
included the development of multi-modal software running on
only 256 kb RAM. On completion of the development of the software,
Aricent was involved in integrating the software over the handset's
hardware and with the D-AMPS/IS-136 module.
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Last updated :
March 10, 2006
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