RED Theory for QoS Provisioning in Wireless Communications

In this paper, the authors study the performance limit of a wireless communication system over a fading channel. The system under study consists of a finite-buffer discrete-time queueing system on the link layer, and a rate-adaptive channel coding system on the physical layer. The objective of this paper is to analyze the relationship among data Rate (R), packet Error probability (E), and Delay bound (D), under the interaction between the link layer and the physical layer. In their analysis, they consider three types of packet errors, i.e., packet drop due to full buffer, packet drop due to delay bound violation, and packet decoding error due to channel noise. They obtain an upper bound on the packet error probability.