Reliability of adaptive transmission in state-based channels for Land Mobile Satellite communications

The modern approach in wireless multimedia communications is toward the adaptation of transmission parameters subject to internal and external requirements and constraints, represented by, e.g., the user QoS, the propagation environment, the traffic behavior, the external interferences. One of the most challenging issues that arises during the parameters adaptation is the temporal behavior due to the continuous change of the external context; in that sense it is important to focus the attention on the timing constraints that impact on the system capability of adapting the transmission parameters in a reliable way. The satellite communications (SatCom) are especially affected by the delay problems, due to the high propagation Round Trip Time (RTT). Herein we analyze the temporal behavior of the Land Mobile Satellite (LMS) environment, aiming to define a reliability index for different operational speeds and scenarios.