Enhancing Satellite System Throughput Using Adaptive HARQ for Delay Tolerant Services in Mobile Communications

摘要

In this paper we propose the introduction of adaptive hybrid automatic repeatrequest (HARQ) in the context of mobile satellite communications. HARQ schemeswhich are commonly used in terrestrial links, can be adapted to improve thethroughput for delay tolerant services. The proposed method uses the estimationof the mutual information between the received and the sent symbols, in orderto estimate the number of bits necessary to decode the message at nexttransmission. We evaluate the performance of our method by simulating a landmobile satellite (LMS) channel. We compare our results with the static HARQscheme, showing that our adaptive retransmission technique has betterefficiency while keeping an acceptable delay for services.