On the use of S-ALOHA with retransmission control in wireless IR networks

This paper presents an investigation of the effect of blockage due to shadowing, on the throughput performance of random access ALOHA-type protocols when used in wireless IR indoor networks. In a previous work it was shown that the performance of slotted-ALOHA with a constant retransmission policy, when used as the uplink medium access technique in a wireless IR network, suffers high performance degradation up to 30%, due to link blockage. In this paper we propose the use of various retransmission policies in order to improve the protocol performance