演講者：羅元勳 教授
國立屏東大學應用數學系
日 期：2019年10月16日（星期三）14:30
地 點：國立高雄大學理學院408室
講 題：Random and Deterministic Schemes for a Collision Channel without Feedback
摘 要：
There are two main medium access control (MAC) approaches to a slot-synchronous collision channel without feedback: random (slotted ALOHA) and deterministic (protocol sequence-based) schemes. Unlike the traditional slotted ALOHA, protocol sequence-based scheme is a deterministic way to guarantee a positive individual throughput within an expectable period of time, even the time synchronous is hard to be achieved. In the rst part of this talk, I will survey some results on protocol sequence-based schemes, including user-irrepressible (UI) sequences and con ict-avoiding codes (CACs). Then, for a fair comparison, deadline-constrained slotted ALOHA schemes will be introduced to maximize the probability that a packet can be successfully received within an pre-assigned deadline. Some recent progress including the uniqueness of the optimal transmission probability that maximizes the successful delivery probability under multiple-packet reception (MPR) technology is addressed as well.
