Throughput-Delay Trade-Off for Slotted Aloha Multiple Access with Capture Effect

Problem statement: Medium Access Control (MAC) protocols are one of most important research issues in communication and networking. There have been proposed several MAC protocols in wireless as well in wired networks. Approach: ALOHA-based protocol is the simplest one, being able to provide prompt access, reliable channels and support for quality of service. However its limited capacity, low throughput and excessive delays make it not suitable for several applications. Results: So there had been many efforts devoted to increase its performance, one of them is the capture effect. With capture effect, the packets arriving with the highest power had a good chance to be detected accurately, even when other packets were present. Conclusion: In this study, a throughput-delay tradeoff was investigated to improve the network performance. The capture threshold was assigned to the highest throughout/time delay ratio. Therefore, the capture threshold which provided a high throughput and low time delay was selected by a central node.