Energy-efficiency (EE) and spectrum-efficiency (SE) are two critical design considerations for mobile ad hoc networks (MANETs), but they sometimes conflict with each other. However, existing results rarely focused on how the node mobility impacts EE and SE on the video streaming over wireless networks. This paper provides a theoretical analysis of the fundamental EE-SE tradeoff, through developing an energy-spectrum-aware scheduling scheme to investigate and understand the relationship between the EE and SE for video streaming over MANETs. Specifically, the authors study multi-user wireless video transmissions with the random mobility velocity. The paper derives the EE-SE tradeoff range and the energy-spectrum efficiency index bound, by considering the impact of node mobility on EE and SE. Moreover, the authors integrate different video metrics (in terms of video quality and end-to-end delay) with EE and SE. Based on their previous proposed distributed minimum-distortion scheduling scheme, the authors design an energy-spectrum-aware scheduling scheme. The performance of the proposed scheme is evaluated on NS-2 and compared with other two popular scheduling schemes, DMDS and OEAS. Simulation results show that the proposed scheme has a considerable performance advantage in terms of joint EE-SE. This work will shed insights on the fundamental design guidelines on building an energy and spectrum efficient mobile video transmission system.
This paper has been recommended as a "Distinguished Paper" in the IEEE ComSoc MMTC Reviewer Letter in December 2013.