Wireless Communications

DIGITAL CELLULAR NETWORK SYSTEM — Implemented a digital cellular network system, which included multiple subscriber units (IS54 protocol), base transceiver systems, base station controllers, and a network monitoring and control system. The software was developed in C under a UNIX/VxWorks platform, using the ClearCase configuration management tool.

VOICE ACTIVATED DIALING SERVICE — Developed a prototype system to provide a voice activated dialing service for a major mobile telephone customer.

MOBILE COMMUNICATIONS FIRMWARE — Developed all firmware for a mobile communications device to be used on the INMARSAT satellite network, including the design, implementation, and test of the keyboard interface and memory management system.

VOICE COMMAND AND CTI PRODUCTS TESTING — Testing of SS7 Signaling enhancements, Wireless Local Number Portability and Voice XML Browser feature additions to Voice Command and CTI products. Assessed conformance of product to VoIP industry standards, including H.323, RTP/RTCP, MGCP, MEGACO, SIP/SDP and RSVP.

MOBILE COMMUNICATIONS SYSTEM TESTING — Wrote software test plans for the Screen Designer and Mobile Terminal Communications Engine for a mobile communications system.

RF TEST PROGRAMS — Designed and implemented test fixture control software for the RFM board functional testing on a mobile communications satellite project. The test software development effort involved defining and implementing RF test programs to verify that the RFM board was meeting its functional specifications. Some of the tests implemented were PLO alarm detection, temperature, transmit and receive frequency sweep, transmit and receive gain control, transmit phase noise, spurious emissions, carrier on/off power, and transmit isolation.

WIRELESS REMOTE TESTING — Designed a conceptual model for wireless remote testing and management of next-generation telecommunications networks. The concept promises to advance the benefits of remote network management and service assurance from the service provider’s operations centers into almost any wireless-accessible point, for any security-enabled employee, customer, or partner. The concept allows the provider to further accelerate service activation and verification, isolation and resolution of service outages or degradation, reduce time to revenue return, and improve customer responsiveness.