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This paper focuses on the energy management problem of ultra dense wireless networks. The work modes of small cells are controlled by the software defined approach to reduce the system energy consumption. Considering the quality of service (QoS) requirements of users and coverage ratio requirement, the energy minimization problem are formulated as a mixedinteger nonlinear programming (MINLP) problem...
In this paper, we investigate the delay-aware dynamic resource management problem for multi- service transmission in high-speed railway wireless communications, with a focus on resource allocation among the services and power control along the time. By taking account of average delay requirements and power constraints, the considered problem is formulated into a stochastic optimization problem, rather...
With the rapid development of high-speed railway (HSR) system, there is an increasing demand on providing high quality multimedia services for HSR passengers. In this paper, we investigate the downlink resource allocation problem for multimedia services delivery in HSR orthogonal frequency division multiple access (OFDMA) system. Taking the statistical delay-QoS requirements into account, we formulate...
The energy balancing is one of the main concerns in wireless sensor networks (WSNs). Different from current methods, this paper attempts to solve the unbalanced energy consumption problem in the orthogonal frequency division multiplexing (OFDM) system for a WSN. The objective is to increase the sum throughput with almost equal energy consumption among the sensor nodes. Inspired by this goal, we formulated...
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