Minimum delay scheduling with multi-packet transmission in wireless networks

Abstract

Abstract-This paper studies the problem of minimum delay scheduling in wireless networks with multi-packet transmission capability. Specifically, we assume that the network employs superposition coding at the physical layer in order to implement multi-packet transmission. While most studies on superposition coding assume that unbounded number of packets can be coded together, physical and MAC layer limitations restrict the number of concurrent packets in a transmission set. Taking this constraint into consideration, we formulate the minimum delay scheduling as a combinatorial optimization problem and study its computational complexity under different transmission set sizes. We show that, when the transmission set size is limited to 2 packets, the problem can be solved optimally in polynomial time. Moreover, while the complexity of the problem for larger transmission set sizes is unknown, we present close-to-optimal heuristic algorithms that compute efficient solutions for the problem in polynomial time. Numerical results are also presented to study the efficiency and utility of the presented scheduling algorithms. Our results show that the heuristic algorithms are highly efficient, achieving delays that are less than 2% away from the optimal values.

QoS based Admission Control using Multipath Scheduler for IP over Satellite Networks

“…The study of delay scheduling topic has been done by many researchers in the fields of TCP/IP protocol layers for efficient user data locality management and for minimizing the effect of transmission delays over heterogeneous networks [12][13][14]. Inspired by the work in the previous studies, we adopt the method as part of the admission control system in order to regulate the traffics flow across the terrestrial-satellite networks.…”