In 2001, SED worked under sub-contract to Hughes to assist in developing the Inmarsat Early Entry (IEE) packet data satellite communications system. The IEE system, also known as R-BGAN, is the precursor to the current Inmarsat-4 BGAN system. SED was initially contracted to provide on-site consulting during the requirements analysis and system design phase of the IEE program. On completion of the consultation, SED was further sub-contracted to design, develop, install, and support the PRMS subsystem of the IEE gateway system.
The PRMS is a highly-available fault-tolerant software subsystem that is responsible for determining when and where satellite channels are to be reused (which sub-beams), assigning channels to gateway channel units and processing elements, and assigning users to carriers as they access the gateway. The PRMS manages configuration of carriers on the allocated satellite channels by selecting and configuring appropriate equipment. Using utilization reports and requests for service, received from the gateway processing elements, the PRMS periodically performs a ranking to determine the number of satellite channels needed to service the current traffic demands in each sub-beam. The results of the periodic ranking result in new carriers being set up to satisfy high user demand and under-utilized channels being returned for reallocation by first coordinating the reassignment of allocated users. Additionally, the PRMS manages the power level of each carrier, and coordinates the abatement of over-assigned channels.