The document summarizes a time and power based positioning scheme for indoor location awareness. It describes a network model with manager, relay, and agent sensor nodes. The scheme uses time difference of arrival and received signal strength from radio and ultrasound signals across three sensor nodes to estimate range and mobile terminal location through trilateration. Performance is evaluated by distributing 12 sensor nodes in a 100m x 100m area and simulating 20 mobile terminals moving randomly between destinations at varying speeds and pause times.