Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network


We investigate an energy-saving sleeping mechanism in a cache-aided ultra-dense network (UDN) with delay constraints. As in existing works, we consider the video and file contents of the UDN. The video contents are cached at and delivered by a small-cell base-station (sBS). The cache-aided sBS cooperates with a macro-cell base-station (mBS) to service the file contents. The optimal sleeping strategy that conserves energy under the delay constraint is formulated as an energy-consumption minimization problem under the network stability condition with a guaranteed delay constraint. To find its solution, the minimization problem is transformed into a joint optimization problem of energy consumption and delay by the Lyapunov technique. A delay-constrained sleeping algorithm is proposed, and its effectiveness is confirmed by the numerical results of a simulation study. A tradeoff between energy consumption and delay, achieved by adjusting the weighting factor in the cache-aided UDN, is also demonstrated.

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This work was partially supported by National Major Project (Grant No. 2017ZX03001002-004), National Natural Science Foundation Project of China (Grant No. 61521061), and 333 Program of Jiangsu (Grant No. BRA2017366).

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Correspondence to Zhiwen Pan.

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Li, P., Gong, S., Gao, S. et al. Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network. Sci. China Inf. Sci. 62, 82301 (2019).

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  • ultra-dense networks
  • sleeping mechanism
  • mean delay
  • caching strategy
  • energy saving