Energy efficient packet scheduling over multiple channels

This paper focuses on minimizing the average power consumption of single transmitter providing Quality of Service (QoS) enabled traffic to a single receiver. Both transmitting and receiving station are equipped with multiple antennas. A general {K×M} system model, where K is the number of independently buffered QoS streams and M is the number of parallel channels available through Multi Input Multi Output (MIMO) Singular Value Decomposition (SVD) eigen mode transmission is considered. By using the combination of constrained Finite State Markov Chain process (FSMC) framework and a novel MAC layer rate assignment scheme, a randomized per-buffer scheduling policy is obtained. The designed policy exploits queue state information (QSI) to schedule the traffic while meeting throughput, delay and loss constraints. Packets scheduled for transmission during each frame are mapped across the set eigen mode channels subject to available channel resources and the set of channel eigen values. Simulation results show that the proposed scheduler is able to exploit full QSI to meet QoS requirement while reducing average power consumption and complexity.