The Mobile User Objective System (MUOS) is being developed to nieet a continuing Department of Defense (DoD) reguirenzent for mobile unprotected narrowband beyond line-of-sight communications. The A4UOS will replace the current UHF Follow-On (UFO) satellite constellation as those satellites reach end-of life. As part of this efort a new Common Air Inteirface (CAI) will be developed to standardize the waveform used behveen MUOS user terminals and the satellite. This paper describes a protocol capable of satis&ing the MUOS Operational Requirements Document ( O D ) directive to provide a higher guality of service than the current UFO system is capable of providing. This protocol captures key features j+om the Integrated Wavefornz, a waveform being developed as a possible future replacement for the two current Demand-Assigned Multiple Access ( D A M ) waveforms now required for operation over 5-kHz and 25-kHz UHF military satellite channels. The new CAI would greatly simplifi the use of UHF satellite communications by automatically locating a control channel, capturing the list o f available services, and passively connecting to these services. The new CAI should include a standard medium access control (MAC) protocol layer to allow use of modern communication protocols, and provide standardized protocols for voice and messaging that could be easily extended to systems outside of the MUOS network.
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