Simulation Based Performance Evaluation of Resource Allocation Algorithms forImplementation in the SHF-DAMA Satellite Network

摘要

Sponsored by DISA, the SHF-DAMA Standard addresses the warfighter's requirementsfor flexible, reliable, and efficient (technically and fiscally) satellite communications. The Standard proposes a system supporting both packet data transfer and single-channel-per-carrier voice and data circuits assigned on a demand basis. The Standard does not address management of the DSCS 3 transponder's bandwidth and power resources among priority classes of users. This effort characterizes the SHF-DAMA system's performance over each combination of the following resource management algorithm features: (1) preemption enabled and disabled; (2) using the Standard-specified collision resolution technique and a binary exponential backoff; (3) using complete partitioning, complete sharing, and sharing with minimum allocation strategies. The author introduces a novel algorithm for avoiding unnecessary preemption. A simulation written in MODSIM 2 collects the following measures of performance over a broad load range: (1) call establishment delay, (2) number of calls simultaneously supported, (3) power used, and (4) number of calls preempted. The primary conclusion drawn using graphical and hypothesis testing methods is that the SHF-DAMA system should implement the complete sharing management algorithm. This algorithm reduces call setup time and most efficiently manages satellite resources. As a secondary conclusion, the binary exponential backoff proves to be not significantly better than the Standard-specified backoff.